CallManager Express Setup for IP Phone Firmware Upgrade - How to Upgrade Your Cisco IP Phone Firmware

Learn how to upgrade your Cisco IP phone firmware. Covered topics include: Setup CallManager Express DHCP & TFTP Server for IP Phones, commands to upload & extract SCCP - SIP firmware files (cmterm-xx.tar), plus important information for the firmware upgrade process.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/930-cisco-phone-upgrade.html

Cisco Aironet 1100 & 1200 Series (1110, 1121, 1142, 1230, 1240, 1242AG) Factory Reset & Configuration Reset Procedure via CLI and Web GUI

This article shows how to reset to factory defaults all Cisco Aironet 1110, 1121, 1142, 1230, 1240, 1242AG access points. We cover factory reset procedure via Mode Button and Web Interface, and show CLI output during the Password Reset & Recovery – Factory Reset procedure.

http://www.firewall.cx/cisco-wireless/929-cisco-wireless-aironet-reset.html

Merry Christmas and a Happy New Year

The Firewall.cx Team would like to wish everyone a Merry Christmas and a Happy New Year!!

http://www.firewall.cx/site-news/928-news-xmas-wishes-2012.html

GFI LanGuard 2012 SR1 - Enhanced Network Management, Device Vulnerability Checks, Patching & Reporting

GFI LanGuard 2012 SR1 - New Product Features designed to assist network administrators and engineers make their life much easier! Manage your Windows, MacOS or Linux network with the help of GFI's latest Languard!

http://www.firewall.cx/news/161-Software/927-news-gfi-languard-update.html

How to Register Cisco IP Phones & Connect CallManager (CUCM) Cluster with CME or UC520, UC540. UC560 via H.323 Gateway

Learn how to connect CallManager Express (CME)and UC500 (UC520, UC540, UC560) with CallManager (CUCM)via H323 gateway. We cover necessary CME startup configuration and all necessary steps to connect it with CUCM cluster. IP Phone registration with CME and CUCM is also explained.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/922-cisco-voice-cucm-cme-h323.html

Cisco VPN Client Software Download (Windows 32bit - 64bit, Linux 32bit - 64bit, MacOS)

Freely download the latest Cisco VPN Client Software for 32 and 64 bit Windows, Linux and MAC OS operating systems. Cisco VPN Client v5 and v4 available.

http://www.firewall.cx/site-news/925-cisco-downloads-vpn-client.html

IP Phone 7945, 7965, 7975 Factory Reset Procedure, SCCP Firmware Upgrade & CME DHCP Server Setup

Learn how to reset your Cisco IP Phone firmware, perform firmware upgrade, setup CallManager Express DHCP Server for IP Phones (option 150), necessary commands to upload & extract firmware files (cmterm-XX.tar) on your CME router.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/924-cisco-voice-ipphone-upgrade.html

Network Fax Server Solution: GFI FaxMaker. Fax over IP, SMS, Email (SMTP/POP3), OCR, ISDN & More!

GFI FaxMaker - Recommended Fax Solution. Send and receive faxes without fax boards or phone lines. This popular fax-server software provides impressive features and fax security abilities to help resolve company fax problems. Fax by sms, email and much more

http://www.firewall.cx/news/161-Software/923-news-gfi-fax-server.html

MPLS Case Study: Why Route Summarization is not Recommended on Loopbacks in an MPLS Environment - Network

This article focuses on the impact of route summarization summary on loopback addresses in an MPLS environment and what work-arounds are available to overcome problems caused by the route summarization performed by ABR (Area Border Router). LSR (Label Switch Router) - LDP (Label Distribution Protocols)

http://www.firewall.cx/networking-topics/wan-technologies/917-cisco-mpls-loopback-sum.html

VMware: End of Availability of ESX 4.x - Time to Upgrade.

VMware Announces End of Availability Date for VMware vSphere� ESX hypervisor 4.x and VMware Management Assistant Versions 1 and 4

http://www.firewall.cx/news/161-Software/921-vmware-esx4-eoa.html

How to Recover & Create "Show Desktop" Icon Function on Windows 7, Vista, XP and 2000

Learn how to create or restore the Windows Show Desktop icon (Show Desktop.scf)to hide, restore applications and easily access your desktop. Covers Windows XP, Vista, Windows 7, Windows 2000 and Windows 2003 Server

http://www.firewall.cx/microsoft-knowledgebase/windows-2000-server/920-windows-show-desktop.html

How to Enable & Disable Phone Ports on Cisco ATA 186/188 for CallManager - CallManager Express

This article shows how to enable or disable the first or second phone port on the Cisco SCCP ATA 186/188 telephony adaptor. Learn how to identify Cisco SCCP/SIP ATA phone ports on CUCME (CME), plus the parameters-changes required to disable or enable them.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/918-cisco-voice-ata-ports.html

How to Upgrade - Update Cisco ATA186 / 188 Firmware and Reset to Factory Default

This article shows how to easily upgrade the firmware on a Cisco ATA 186 - 188. Instructions to reset to factory defaults is also included. You'll also find a brief introduction on the Cisco ATA and differences between the two models.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/858-cisco-voice-ata-186-upgrade.html

Book Review: The Official VMware VCP5 Certification Guide

Our latest review comes from VMware press: The Official VCP5 Certification Guide. Learn how this cert guide can help you earn your VCP5 certification and master VMware's vSphere 5 virtualization environment.

http://www.firewall.cx/site-news/916-book-review-vcp5.html

Risk Management for Cisco Unified Communication Solutions - Countermeasures & Mitigation

Understand the security risks of Cisco Unified Communication environments. We cover risk-threat definitions, type of threats, risk of impact, Mitigating Risks, Risk Management Specifics for Cisco UC and much more.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/914-cisco-unified-com-risk-management.html

Interview: Akhil Behl Double CCIE (Voice & Security) #19564

Interview of Akhil Behl - Double CCIE (Voice & Security)and Cisco Press author. Discover Akhil's troubleshooting techniques, guidelines in designing and securing VoIP networks, advantages and disadvantages of Cisco VoIP Telephony, how he obtained his double ccie certification and much more!

http://www.firewall.cx/general-topics-reviews/ccie-experts/915-akhil-behl.html

Book Review: Securing Cisco IP Telephony Networks - By Akhil Behl Double CCIE (Voice & Security) #19564

Cisco Press Review:Securing Cisco IP Telephony Networks. Network security is of paramount importance and IP Telephony is not to be left behind. This book aims to explain an End-to-End IP Telephony Security approach and architecture. Read our exclusive review of this outstanding title!

http://www.firewall.cx/site-news/913-book-review-secure-voip-networks.html

Firewall.cx - Cisco CCIE Experts & Cisco Press Authors Collaboration

Firewall.cx announces its collaboration with Cisco CCIE experts and Cisco Press authors. We’ll be interviewing these experts and revealing how they managed to obtain their certifications, how they deal with challenging problems, understand their proven troubleshooting techniques, listen to their advice for newcomers and engineers seeking to increase their knowledge and expertise, plus much more!

http://www.firewall.cx/site-news/912-news-ccie-authors.html

Unity Express License Setup & Installation - Software Activation

This article shows how to verify, register and assign a Cisco Unity Express license. Topics covered: Cisco Product Authorization (PAK) registration, license download, unity express software activation, Unity Express license installation, understanding output of show license commands and many useful hints & tips. Covers CME, UC500, UC520, UC540, UC560 systems

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/911-cisco-voice-ue-software-activation.html

Comparing DMVPN Single Tier and Dual Tier Headend Architectures - IPSec VPN & mGRE Termination

This article explains the difference between DMVPN Single Tier and Dual Tier Headend setup. We examine each model and show how IPSec and GRE/mGRE tunnels terminate on the Hub Headend and Frontend router. Detailed diagrams show how protocol packets are encapsulated and decapsulated for each scenario.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-services-tech/910-cisco-dmvpn-single-dual-tier.html

Book Review: VMware vSphere 5 Building a Virtual Datacenter (VMware Press Technology)

Book Review: VMware vSphere 5 Building a Virtual Datacenter (VMware Press Technology). Discover what this great title has to offer to the Virtualisation community and how it can help you design, plan and migrate into the virtualisation environment.

http://www.firewall.cx/site-news/909-book-review-vmware-vsphere5.html

Cisco Dynamic Multipoint VPN (DMVPN) Deployment Models & Architectures

DMVPN Deployment Architectures. We examine the different deployment models along with their strong and weak points. DMVPN models covered include: Single and Dual DMVPN Network/Cloud with Single Tier Headend, Single and Dual DMVPN Network/Cloud with Dual Tier Headend and others.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-services-tech/908-cisco-dmvpn-models.html

Configuring CallManager Express (CME) To Support Cisco Jabber IP Phone for Android & iPhone

This article covers setup of CallManager Express to support Cisco Jabber for Android and iPhone users. We analyse CME requirements, caveats and provide full configuration-setup commands, screen shots and bug details for Jabber Android and iPhone. CME 8.6 ( IOS 15.1(4)M ) Supports iPhone, CME v9.1 (IOS 15.2(4)M1) adds support for Android.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/907-cisco-voice-jabber-android-iphone.html

Software Review: Colasoft Capsa 7 Enterprise Network Analyzer

Firewall.cx's review of Colasoft's Capsa v7 Enterprise Edition network analyser. Learn what makes Capsa Enterprise an outstanding network analyser and packet sniffer. Full review includes screen-shots and in-depth analysis.

http://www.firewall.cx/general-topics-reviews/hot-product-reviews/905-reviews-colasoft-capsa-7-enterprise.html

Configuring Cisco SSL VPN AnyConnect (WebVPN) on Cisco IOS Routers

This article covers Cisco SSL VPN AnyConnect Secure Mobility Client (webvpn) configuration for Cisco IOS Routers. Learn to configure Cisco AnyConnect for Windows, iPhone, iPads and Android mobile phones (AnyConnect Secure Mobility Client). We provide all necessary commands, installation files and necessary SSL_VPN license information to ensure an easy installation and complete configuration.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/904-cisco-router-anyconnect-webvpn.html

Configuring Cisco Dynamic Multipoint VPN (DMVPN) - Hub, Spokes, mGRE Protection and Routing

This article covers setup and configuration of Cisco DMVPN. Topics covered include: DMVPN operation, Configuring DMVPN Hub router, NHRP, mGRE, DMVPN Spoke routers, Protecting DMVPN with IPSec, enable routing between DMVPN tunnels and verifying DMVPN status and remote networks.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/901-cisco-router-dmvpn-configuration.html

Book Review: CCNP Security VPN 642-648 Official Cert Guide

Firewall.cx reviews Cisco Press's CCNP Security VPN 642-648 Official Cert Guide (2nd edition). Discover VPN technologies and designs supported by the Cisco ASA Firewall, how to implement site-to-site VPN, Clientless SSL VPN, AnyConnect Remote Access VPN and much more. This is a ‘must have’ weapon in your arsenal of network security.

http://www.firewall.cx/site-news/898-book-review-ccnp-642-648.html

Download Cisco CallManager Express CCME GUI Administration Installation Files

Download Free Cisco CallManager Express (CCME) Graphical User Interface (GUI) files! We provide free direct download and instructions on how to install CCME GUI on your CCME router. Provided files cover CCME v3.3, CCME v4.1.0.2, CCME v4.2, CCME v7.1.0.1, CCME v8.5 and CCME v8.6 .

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/900-cisco-voice-ccme-gui-download.html

Book Review: CCNP Security FIREWALL 642-618 Official Cert Guide

This time we review one of Cisco Press's latest CCNP Security Firewall titles: CCNP Security FIREWALL 642-618 Official Cert Guide. Read our review and find out what makes this title stand out from everything else you've ready until today. A title that will help any engineer dealing with Cisco Security Firewall Appliances and technologies.

http://www.firewall.cx/site-news/897-book-review-ccnp-642-618.html

Understanding Cisco Dynamic Multipoint VPN - DMVPN, mGRE, NHRP

This article serves as an introduction to the Cisco Dynamic Multipoint VPN (DMVPN) service. Learn what DMVPN is, mechanisms used (NHRP, mGRE, IPSec) to achieve its flexibility and data confidentiality, plus the prerequisites for installation and setup. DMVPN Hub & Spoke, Spoke-to-Spoke concepts are also covered using our unique network diagrams.

To read our DMVPN article, click here.

GFI Cloud - Network Server Monitor Online Review & Road Test

Read up on Firewall.cx's extensive review on GFI's new Cloud services. We cover GFI's new Network Server Monitor - Cloud Edition. Understand what could services are all about and how GFI has successfully managed to produce an outstanding suite of products for companies around the globe.

http://www.onlywire.com/r/100653479

Colasoft: nChronos v3 Server and Console Review

Firewall.cx's review of Colasoft's popular nChronos - Network Analysis Server. Discover how this product can help identify threats, network security problems, intruders, forensic analysis and mitigate security risks, plus much more. Our in-depth review shows why this product is necessary in any network environment and how companies can benefit from it.

http://www.firewall.cx/general-topics-reviews/hot-product-reviews/894-reviews-colasoft-nchronos.html

End-of-Sale and End-of-Life Announcement for the Cisco Catalyst 3750G, 3560G, 3750-E, and 3560-E Series Switches

Cisco announces the end-of-sale and end-of-life dates for the Cisco Catalyst 3750G, 3560G, 3750-E, and 3560-E Series Switches. The last day to order the affected product(s) is January 30, 2013. Customers with active service contracts will continue to receive support from the Cisco Technical Assistance Center (TAC) as shown in Table 1 of the EoL bulletin.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-switches/893-cisco-switches-eol.html

Colasoft Launches nChronos v3.1 Back-in-time Network Analysis Solution

Colasoft Launches Version 3.1 nChronos Back-in-time Network Analysis Solution. nChronos now delivers real-time network monitoring, key real-time traffic statistics and charts are available, such as throughput and top IP talkers

http://www.firewall.cx/news/161-Software/892-news-colasoft-nchronos31.html

Announcing Firewall.cx - Colasoft Collaboration

Firewall.cx, one of the world’s leading networking technology websites, announces its official collaboration with popular Colasoft, a company dedicated to the development of innovative network analysis software and solutions. With this collaboration, Firewall.cx aims to provide its world-wide audience access to Colasoft’s popular and multi-awarded software applications covering network and packet analysis solutions.

http://www.firewall.cx/site-news/890-news-colasoft-collaboration.html

Cisco Unity Express Installation/Setup - Service Module & Initial Web Interface Configuration - Part 2

Cisco Unity Expres v7, v8 & v9 Setup and initialization for CallManager Express. Covered topics include: ISM-SRE-300-K9 & SM-SRE-700-K9 CCME configuration, Web configuration, Unity Express module setup, authentication and basic voice-mail parameters. Plenty of screen shots and complete CCME/Unity Express CLI commands included.

http://www.onlywire.com/r/96688038

Cisco Unity Express - ISM-SRE-300-K9 & SM-SRE-700-K9 Installation – Part 1

This two-part article covers the installation and setup of Cisco ISM-SRE-300-K9 & SM-SRE-700-K9 Service Engine Ready (SRE) Modules, running Cisco Unity Express on ISRG2 routers (2911 & 3945) with CallManager Express (CME). Photos of modules and routers included.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/888-cisco-unity-express-sre-300-700.html

Linux CentOS - Redhat EL Installation on HP Smart Array B110i SATA RAID Controller - HP ML/DL Servers

This article covers the installation of HP's Smart Array B110i SATA Raid controller for Linux Redhat, CentOS and SUSE operating system, on any HP Server (DL or ML Series). Included are step-by-step instructions, drivers and applications to create the HP Driver Diskette and all necessary information to begin your installation.

http://www.firewall.cx/linux-knowledgebase-tutorials/linux-administration/887-linux-b110i-sata-controller.html

CallManager Express GUI Bug - Version 8.8 & 9.0

Cisco CallManager Express Web Interface (GUI) bug on version CME 8.8 & 9.0. This news post serves to inform CME engineers and users about a GUI bug that renders useless the web interface as no changes can be saved. Work-around provided.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/886.html

Installation and Setup of Cisco SG500-52P - 500 Series Stackable Managed Switches

This article introduces the Cisco SG500 series switches and covers basic and advanced features. Topics include: Connecting to CLI, Vlan configuration, Enabling Router mode, assigning IP addresses, default Gateway, DNS, IP routing, NTP, management methods and much more.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-switches/885-cisco-switches-sg500-52p.html

Is your desk filled with Cisco Press? | Impress Cisco Press and Win Free Cisco Press Books

Cisco Press will give away Free books to three lucky winners who upload pictures of their Cisco Press collection - Let's impress Cisco Press!! Check our link to read more on this amazing competition!!!

http://www.firewall.cx/news/162-Education/884-cisco-press-awards.html

Errdisable Port State, Enable & Disable Autorecovery Feature

This article explains the Errdisable feature on Cisco Catalyst switches. Learn why and how ports are automatically disabled/shutdown, how to configure the Catalyst switches for autorecovery from err-disable states and selectively disable Errdisable feature for different reasons.

http://www.onlywire.com/r/93603749

LPT Ports - Parallel Direct Cable Connection and pinouts

This article explains the how the PC parallel port works and its pinouts. Covered topics include type of parallel ports, pinouts, 4 and 8 bit ports, EPP Port, ECP Port, transfer speeds and more. We show how to create a LPT Direct connect cable and provide a Direct Parallel connection monitor utility.

http://www.firewall.cx/networking-topics/cabling-utp-fibre/120-network-parallel-cable.html

CAT5, CAT5e, CAT6 UTP X-Over Cable

This article shows how to create a UTP cross-over (x-over) cable using CAT5, CAT5e or CAT6 cable. We explain when UTP crossover cable is required, how to use it and its differences with UTP straight-thru cable. Detailed diagrams and information is included to ensure no question is left unanswered!

http://www.firewall.cx/networking-topics/cabling-utp-fibre/114-network-cabling-utp-xover.html

Resolving Cisco Router/Switch Tftp Problems: Source IP Address - The 'IP TFTP Source-Interface' Command

This article explains how to configure a Cisco device with multiple IP interfaces (router or switch) with the 'tftp source interface' command, to help overcome problems when trying to tftp to or from the Cisco device.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/882-cisco-ip-tftp-source-interface.html

Understanding Serial Direct Cable Connection

This article explains the concept of serial data connections. Topics covered include: PC Serial ports, pinouts, speeds, connector interfaces (db9, db25), null modem cable pinout (db9 and db25) and much more. Included are diagrams with all pinouts and functions.

http://www.firewall.cx/networking-topics/cabling-utp-fibre/121-network-serial-cable.html

Understanding Straight Thru UTP Ethernet Cables

This article covers UTP Cat5, Cat5e & Cat6 cabling, pin designations (pinouts) for both T-586A & T-586B standards, schematics, plus a wealth amount of information to help you understand the differences between the available standards.

http://www.firewall.cx/networking-topics/cabling-utp-fibre/113-network-cabling-utp-st.html

Unshielded Twisted Pair (UTP) - CAT 1 to CAT5, 5e & 6

Introduction to network cabling. This introduction article examines the different type of category cables available in the market - from the older CAT1 cable standard to the newer CAT5e & CAT6 supporting up to 1Gbps speeds.

http://www.firewall.cx/networking-topics/cabling-utp-fibre/112-network-cabling-utp.html

Installing & Configuring Linux Webmin - Linux Web-Based Administration

Linux Administration made easy with Webmin. Learn how to fully administer Linux via web-based interface. Covered topics include: Webmin installation, linux user & group management, file system, disk quota, linux bootup & shutdown process, log files, dns server, dhcp server, ftp server, linux backup, cron jobs, ssh server, apache http server and much more.

http://www.firewall.cx/linux-knowledgebase-tutorials/linux-administration/880-linux-webmin-config.html

Configuring Domain Group Policy for Windows 2003

This article shows you how to configure a Windows Domain Group Policy to control and restrict user access to your servers and local machines. Step-by-step instructions provide all the necessary information to configure your domain group policy.

http://www.firewall.cx/microsoft-knowledgebase/windows-2003-server/241-domain-group-policy.html

Configuring Local Group Policy for Windows 2003

Learn how to configure local group policies for Windows Server 2003, 2008 and 2000. This article will show you step-by-step how to configure Windows Local group policies to help control your users access on a Windows server.

http://www.firewall.cx/microsoft-knowledgebase/windows-2003-server/240-local-group-policy.html

Creating Windows Users and Groups with Windows 2003

Learn how to create local users and groups in Windows 2003. This article shows to how to configure local and domain accounts and groups on Windows 2003 server. Step by step instructions along side with detailed screenshots will provide you will all the necessary information to successfully configure your server.

http://www.firewall.cx/microsoft-knowledgebase/windows-2003-server/239-windows-2003-users-groups.html

VLAN Security - Making the Most of VLANs

VLAN Deployment considerations - Secure design and implementation of VLANs in your network. This article covers key-topics and practices to get the best security and performance out of your VLAN network.

http://www.firewall.cx/networking-topics/vlan-networks/226-vlan-security.html

InterVLAN Routing - Routing between VLAN Networks

This article covers InterVLAN routing. Understand what InterVLAN routing. We examine great detail 4 different methods to perform InterVLAN routing. Servers, routers, switches are all covered as InterVLAN methods.

http://www.firewall.cx/networking-topics/vlan-networks/222-intervlan-routing.html

GFI WebMonitor 2012 Internet Web Proxy Review

GFI Webmonitor Internet web proxy business web monitoring review. We take a look at GFI's latest Webmonitor which promises to provide system admins with top web security features such as site filtering, safe web browsing, monitoring and much more.

http://www.onlywire.com/r/90690876

VLANs - IEEE 802.1q Trunk Link Protocol Analysis

802.1q VLAN tagging analysis. This article analyses the IEEE 802.1q Header tags and fields in great detail with the help of our unique 3D diagrams to help you understand how 802.1q VLAN tagging operates. 802.1q Tagging is widely used in VLAN networks around the world and therefore considered an extremely hot topic all engineers must master.

http://www.firewall.cx/networking-topics/vlan-networks/221-vlan-8021q-analysis.html

VLAN InterSwitch Link (ISL) Protocol Analysis

VLAN - InterSwitch Link (ISL) analysis. This article examines the Cisco propriety ISL frame and analyse its header fields in great depth. Using our easy-to-follow diagrams and analysis you'll understand how an ISL frame is constructed and contents of all fields.

http://www.firewall.cx/networking-topics/vlan-networks/220-vlan-isl-analysis.html

VLAN Tagging - Understanding VLANs Ethernet Frames

Vlan tagging methods. This in-depth analysis will help you understand IEEE 802.1q, ISL, trunk links, untagged & tagged frames, default & management vlan plus much more. Details diagrams and frame analysis will ensure you obtain all the necessary information to master VLANs.

http://www.firewall.cx/networking-topics/vlan-networks/219-vlan-tagging.html

VLANs - Access & Trunk Links

This article examines VLAN Links. Understand how Access & Trunk links works, where they are used. Examples of each type of link is provided along with plenty of diagrams to help visualise the differences.

http://www.firewall.cx/networking-topics/vlan-networks/218-vlan-access-trunk-links.html

Introduction to VLANs - The VLAN Concept

This article deals with the VLAN Concept. Understand what a VLAN Network is and how it is implemented. Compare VLAN networks against old traditional flat networks. We also provide detailed diagrams to help understand the covered concepts.

http://www.firewall.cx/networking-topics/vlan-networks/214-vlan-concept.html

Book Review: Your CCIE Lab Success Strategy: The Non-Technical Guidebook

The Firewall.cx team performs an extensive review of this awesome non-technical CCIE book. Learn what it takes to get your Cisco CCIE certification. Double CCIE authors Vivek Tiwari & Dean Bahizad will show you what it takes to get your CCIE certification!

http://www.firewall.cx/site-news/879-book-review-ccie-lab-success.html

Download Cisco VPN Client for MAC OS & Linux

Free Cisco VPN Client download for Mac OS X 10.5 & 10.6 and Linux Operating System. Client versions are 4.9.01.0280 for MAC OS & 4.8.02.0030 for Linux.

http://onlywire.com/r/88563061

IPv6 Subnetting - How and Why to Subnet IPv6

This article examines IPv6 Subnetting. Understand the structure of an IPv6 128bit Address and how it breaks up to a Network Address Range, Subnet Range and Device Interface ID.

http://onlywire.com/r/88562872

Installing & Configuring VSFTPD FTP Server for Redhat Enterprise Linux, CentOS & Fedora

Learn how to install and configure the Linux vsftpd FTP server. We cover the products features, configuration tips, firewall port exclusion commands, security tips and much more.

http://onlywire.com/r/86333090

LAN Network Topologies

This article explains the different network topologies found in today's networks. We take a look at the Bus Topology, Ring Topology, Star Topology, Mesh Topology, Hybrid Topology and many more, using diagrams and in-depth analysis.

http://www.firewall.cx/networking-topics/general-networking/103-network-topologies.html

IPv6 - Analysing the IPv6 Protocol Structure and IPv6 Header

This article analyses the IPv6 protocol structure and IPv6 header. We examine type of addresses supported by IPv6, IPv6 Extension headers, IPv6 Routing Header, IPv6 Packet size & mtu, IPv6 Traffic Classes and much more.

http://onlywire.com/r/85627177

CallManager Express & UC500 Series: Changing Background Images on a Cisco IP Phone

Installing a customized background image on a Cisco IP Phone and CallManager Express. This article shows you how to install different background pictures on your Cisco IP Phone.

http://onlywire.com/r/84696878

CallManager Express GUI Software Installation & Configuration - Part 2

Cisco CallManager Express (CCME) Graphical User Interface GUI software installation and configuration. This article shows how to identify, install and configure the correct CallManager Express GUI version depending on your Cisco IOS.

http://onlywire.com/r/84696537

CallManager Express GUI Software Installation & Configuration - Part 1

Cisco CallManager Express (CCME) Graphical User Interface GUI software installation and configuration. This article shows how to identify, install and configure the correct CallManager Express GUI version depending on your Cisco IOS.

http://onlywire.com/r/84696283

Cisco CallManager Express Basic Concepts - Part 2

Cisco Call Manager Express & UC 500, UC520, UC540 Basic Concepts. This article explains the basic concepts found in CCME and UC500 series. This article covers the concept of ephone and ephone-dn. Why they are and how they are used to create extensions and assign them to IP Phones. We also explain what a codec is and take a look at the two most popular codecs G711 and G729 and explain their differences.

http://onlywire.com/r/84696044

Cisco CallManager Express Basic Concepts - Part 1

Cisco Call Manager Express - UC500 Basic Concepts. This article explains the basic CCME concepts to help the reader understand how the technology works. Learn how Call Manager Express works, PSTN and ISDN Interfaces it supports, how DSPs are used, codecs, what ephones and ephones-dn are, how IP Phones are connected to the network, how and why we isolate VoIP traffic and how calls are actually performed, plus much much more!

http://onlywire.com/r/84695924

Introduction to Cisco Unified Communication Manager Express (CallManager Express - CME - UC500)

Cisco Unified Communications Manager Express (CUCME), or Cisco Call Manager Express (CCME or CME), is Cisco's introduction to Voice over IP networks. This article will explain the concept of Unified Communications Manager Express, how it works, what hardware and software (IOS) it is based on and finally concludes with some basic configuration required to enable IP Telephony on your Cisco router.

http://onlywire.com/r/84695711

ICMP - Time Exceeded Message Analysis

This article covers the ICMP Time Exceeded Message. We explain when ICMP time exceeded is generated and by which devices in the local network. Full packet analysis and example is provided.

http://onlywire.com/r/84287533

ICMP - Redirect Message Anaylsis

This article analysis the icmp redirect message. Learn when ICMP Redirect messages are sent and how they are used to redirect traffic amongst network gateways

http://onlywire.com/r/84286407

ICMP - Source Quench Message Analysis

This article explains the ICMP source Quench message. Learn when ICMP Source Quench message is sent and how it is used within your local network

http://www.firewall.cx/networking-topics/protocols/icmp-protocol/154-icmp-source-quench.html

Understanding the ICMP - Destination Unreachable Message

ICMP Destination Unreachable analysis. This article will analyse all six ICMP destination unreachable messages and explain when each of these messages are used.

http://www.firewall.cx/networking-topics/protocols/icmp-protocol/153-icmp-destination-unreachable.html

ICMP - Echo / Echo Reply (Ping) Message

This article deals with the analysis of the ICMP Echo & Echo Reply (Ping). We examine the ICMP header and fields to show the contents of a ICMP echo/reply (ping/ping-reply) packet to help understand how the message is formatted and used. Pinging bytes, TTL and response time is also analysed.

http://www.firewall.cx/networking-topics/protocols/icmp-protocol/152-icmp-echo-ping.html

Understanding the Need for IPv6 - How IPv6 Overcomes IPv4 Limitations

This article explains the need for IPv6 Protocol. We explain the main features of IPv6 RFC1752 which include larger IP address space, better security, optimisation and more.

http://www.firewall.cx/networking-topics/protocols/873-ipv6-intro.html

Cisco GRE and IPSec - GRE over IPSec - Selecting and Configuring GRE IPSec Tunnel or Transport Mode

This article aims to explain the differences between GRE IPSec Tunnel and GRE IPSec Transport mode and how they can be configured and implemented in a Secure Cisco VPN Network. Packet Analysis of both modes with detailed diagrams and Cisco IOS configuration commands, ensures the reader will not be left with any unanswered questions on this topic!

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/872-cisco-router-gre-ipsec-tunnel-transport.html

Introduction To The ICMP Protocol

This article explains why the ICMP protocol was created and how it is used to troubleshoot networks. Learn which OSI Level ICMP operates and its characteristics.

http://www.firewall.cx/networking-topics/protocols/icmp-protocol/151-icmp-introduction.html

Book Review: Cisco LAN Switching (CCIE Professional Development Series)

Book review of Cisco press: Cisco LAN Switching (CCIE Professional Development Series). Learn the contents of this excellent title and how it can help you understand your LAN switching environment.

http://www.firewall.cx/news/157-Certification/871-book-reviews-ciscopress-lan-switching.html

Understanding VPN IPSec Tunnel Mode and IPSec Transport Mode - What's the Difference?

This article aims to help clear the difference between IPSec Tunnel and IPSec Transport mode. Each IPSec mode is examined using real examples and packet-level illustrations to ensure both advantages and disadvantages are clearly understood. We also examine IPSec AH & ESP encapsulation-encryption differences for each IPSec mode.

http://www.firewall.cx/networking-topics/protocols/870-ipsec-modes.html

Configuring Point-to-Point GRE VPN Tunnels - Unprotected GRE & Protected GRE over IPSec Tunnels

This article covers the configuration of Cisco GRE Tunnels, unprotected & IPSec protected. GRE Routing between networks, GRE over IPSec and verification commands are included to ensure the GRE IPSec tunnel is operating. Diagrams, commands, mtu, transport modes, isakmp, ipsec and more are analysed in great depth.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/868-cisco-router-gre-ipsec.html

Configuring Site to Site IPSec VPN Tunnel Between Cisco Routers

This article shows how to configure, setup and verify site-to-site IPSec VPN tunnel between Cisco routers. Understand IPSec VPNs, including ISAKMP Phase, parameters, Transform sets, data encryption, crypto maps, check VPN Tunnel crypto status and much more. Full set of commands and diagrams included.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/867-cisco-router-site-to-site-ipsec-vpn.html

Installation of a Cisco Catalyst 4507R-E switch

This article describes that installation of a Cisco Catalyst 4507R-E switch, including two Supervisor Engines II (WS-X4013+) and a 48 port Gigabit PoE module (WS-X4548-GB-RJ45V). We've included a number of detailed pictures showing the whole installation procedure and features supported by the switch.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-switches/340-cisco-switches-catalyst-4507r-e.html

Forcing Your Cisco Catalyst Switch To Use 3rd Party SFP Modules

This article shows how to configure your Cisco Catalyst switch 2960G, 3560G, 3750G, 4507R to use 3rd party SFPs. Learn the secret CLI commands required, to maximise your catalyst switch's compatibility with 3rd party sfp's. Discover where 3rd party SFPs can be used without hesitation.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-switches/866-cisco-switches-3rd-party-sfp.html

Analysing The IP Routing Process - Step-by-Step Analysis

This article explains the IP Routing process with the help of detailed diagrams. We examine step-by-step how a packet is created, sent to a gateway (router) and routed outside the local network. Ethernet, MAC Addresses, ARP, RARP, DNS, ICMP, TCP and other protocol roles are analysed in the example provided.

http://www.firewall.cx/networking-topics/routing/181-routing-process.html

Cisco Type 7 Password Decrypt / Decoder / Cracker Tool

Using Cisco type 7 passwords is no longer recommend by Cisco as they can easily be cracked using the right tools. To prove this, Firewall.cx has created an online password decrypt tool that allows any network administrator/engineer quickly decode all Cisco type 7 passwords. For security reasons, passwords decrypted are not stored on our systems.

http://www.firewall.cx/general-topics-reviews/cisco-cracker.html

How To Secure Your Cisco Router Using Cisco AutoSecure Feature

This article covers the Cisco AutoSecure feature and explains how it can be used to properly secure your Cisco router(s) using Cisco's recommended security practices.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/865-how-to-secure-your-cisco-router-using-cisco-autosecure-feature.html

Analysing TCP Header Options

This article tackles the Options section within the TCP Header. Sections covered include: Maximum Segment Size, Improving performance with Window Scaling, Selective Acknowledgements, Timestamps, Nop and much more. All topics include detailed diagrams and examples.

http://www.firewall.cx/networking-topics/protocols/tcp/138-tcp-options.html

Connecting & Configuring SPA8000 with UC500, 520, 540, 560 & CallManager Express (CCME) - Lost Cost ATA Analog Ports

This article shows how the Cisco SPA8000 can connect with Cisco CallManager Express CCME & UC500 series (UC520, UC540 & UC560), to provide cheap alternative FXS Analog ports. Included are full instructions, commands, diagrams and necessary firmware upgrades.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/864-cisco-voice-uc500-ccme-spa8000.html

How To Upgrade Cisco - Linksys SPA8000 Firmware

This article shows how to upgrade the Cisco Linksys SPA8000 firmware and includes detailed screenshots and step-by-step instructions.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/863-cisco-voice-spa8000-upgrade.html

Media Access Control - MAC Addresses

This article explains the usage of MAC Addresses in the network. We also analyse how MAC addresses are created, how they are used and cover the functions they serve.

http://www.firewall.cx/networking-topics/general-networking/105-mac-addresses.html

Book Review: Automating vSphere with VMware vCentre Orchestrator

To begin with, we were impressed with the informal style of the writer’s delivery. Sometimes this makes or breaks a book’s popularity. Virtualisation is no mean subject, and it can become confusing at times. But the writer’s style has ensured that the content is presented in a very lucid way without compromising the reader’s ability to grasp the matter. Core technical books can become a chore to read through, thanks to a writer’s inability to explain things in a simple way. This cannot be said for this book, which is a welcome change.

http://www.firewall.cx/general-topics-reviews/book-reviews.html?task=view&id=33&catid=137

IP Multicast - Understand How Multicast Works

This article analyses Multicast within a LAN. Topics covered extensively include: basic Multicast theory, Ethernet multicasting, IP multicasting & mapping IP multicasting to Ethernet multicasting

http://www.firewall.cx/networking-topics/general-networking/107.html

Cisco SmartCare Service

This article describes the new revolutionary Cisco Smart Care. We cover installation, upgrade and configuration of the appliance and setup via the Smart Care portal. We also take a look at the discovery and inventory process of the Cisco devices to be covered under the Smart Care contract.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-services-tech/348-cisco-smartcare-intro.html

Power over Ethernet - Understanding PoE Technology, PoE Options & Power Requirements

Understand the Power over Ethernet Technology and how your network devices can benefit from this technology. We also examine the IEEE 802.3af standard and various PoE Class devices. Understand the Power Requirements of Attached Devices, Cable specifications often neglected plus a lot more useful information for any network engineer or IT Manager.

http://www.firewall.cx/networking-topics/general-networking/841-networking-power-over-ethernet.html

Configuring Policy-Based Routing (PBR) with IP SLA Tracking - Auto Redirecting Traffic

How to configure Policy-Based Routing (PBR) with IP SLA Tracking to redirect traffic and provide automatic fail-over. Learn how Cisco PBR and traffic classification works, and how to combine it with IP SLA to provide automatic fail-over protection.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/861-cisco-router-pbr-ipsla-auto-redirect.html

WEB SSL VPN - The Next Wave Of Secure VPN Services

Web SSL VPN is the next generation of VPN Services. This article explains what exactly Web VPN Services are, how they are implemented and what are the advantages over classic VPN solutions.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-services-tech/342-cisco-web-vpn.html

Product Review - GFI LanGuard Network Security Scanner 2011

Our comprehensive review shows what GFI's trusted LanGuard network scanner and patch management product is all about. A stable and enterprise-ready contender worthy of serious consideration by small and medium-sized companies everywhere.

http://www.firewall.cx/general-topics-reviews/hot-product-reviews/859-reviews-gfi-languard-2011.html

Understanding MPLS IP VPNs, Security Attacks and VPN Encryption

MPLS IP VPN. We explain what MPLS networks are and how they work. Learn about MPLS VPN networks, its implementation and security threats. This article also touches on ATM (DSL) IP VPN Networks.

http://www.firewall.cx/networking-topics/wan-technologies/821-mpls-ip-vpn-security.html

How to Upgrade - Update Cisco ATA186 / 188 Firmware and Reset to Factory Default

This article shows how to easily upgrade the firmware on a Cisco ATA 186 - 188. Instructions to reset to factory defaults is also included. You'll also find a brief introduction on the Cisco ATA and differences between the two models.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/858-cisco-voice-ata-186-upgrade.html

Updating Your Linux Server - How to Update Linux Workstations and Operating Systems

This article covers methods and commands used to update your Linux operating system (Server or Workstation) and installed packages. Commands covered include support for RedHat, Fedora, CentOS, OpenSUSE, Debian, Mandriva, Ubuntu, Mint and Knoppix.

http://www.firewall.cx/linux-knowledgebase-tutorials/linux-administration/857-linux-updating-server-workstation.html

Introduction To The ISDN Protocol

ISDN Protocols. Learn about ISDN B and D Channels, difference between PRI T1 & PRI E1 ISDN lines, plus T and E Carriers, Digital Subscriber levels (DS0, DS1, DS2, DS3) and much more. Finally, we'll take a look at the PPP - Point-to-Point protocol and how it is used for Internet ISDN Backup Connections.

http://www.firewall.cx/networking-topics/wan-technologies/237-isdn-introduction.html

The Network Address Translation (NAT) Table

The Network Address Translation table. This article explains the NAT table and its functionality within a router,firewall and server. Understand how the NAT table works, the different NAT modes available and how these can be used to provide increased security for your network, but also expose it if used incorrectly.

http://www.firewall.cx/networking-topics/network-address-translation-nat/228-nat-table.html

Implementing Virtual Servers and Load Balancing Cluster System with Linux

This article explains what Linux Server virtualization is and shows how to create your own Linux virtualization server and configure a load balancing cluster system using RHEL Virtual Servers. Our step-by-step instructions and clear explanations ensure you will start working with Virtual Servers with Linux in no time!

http://www.firewall.cx/linux-knowledgebase-tutorials/system-and-network-services/855-linux-services-virtual-servers.html

Network Address Translation (NAT) Concepts - Introduction

This article introduces the Network Address Translation (NAT)concept. Learn what Network Address Translation is, how it is used and the benefits it provides to networks, companies and workplaces of any size. Our unique award-wining network diagrams are used to help illustrate the operation and concept of NAT.

http://www.firewall.cx/networking-topics/network-address-translation-nat/227-nat-concepts.html

VLAN Security - Making the Most of VLANs

VLAN Deployment considerations - Secure design and implementation of VLANs in your network. This article covers key-topics and practices to get the best security and performance out of your VLAN network.

http://www.firewall.cx/networking-topics/vlan-networks/226-vlan-security.html

InterVLAN Routing - Routing between VLAN Networks

This article covers InterVLAN routing. Understand what InterVLAN routing. We examine great detail 4 different methods to perform InterVLAN routing. Servers, routers, switches are all covered as InterVLAN methods.

http://www.firewall.cx/networking-topics/vlan-networks/222-intervlan-routing.html

VLANs - IEEE 802.1q Trunk Link Protocol Analysis

IEEE 802.1q VLAN tagging analysis. This article analyses the IEEE 802.1q Header tags and fields in great detail with the help of our unique 3D diagrams to help you understand how 802.1q VLAN tagging operates. 802.1q Tagging is widely used in VLAN networks around the world and therefore considered a must for all serious engineers and administrators.

http://www.firewall.cx/networking-topics/vlan-networks/221-vlan-8021q-analysis.html

VLANs - InterSwitch Link (ISL) Protocol Analysis

VLAN - InterSwitch Link (ISL) analysis. This article examines the Cisco propriety ISL frame and analyse its header fields in great depth. Using our easy-to-follow diagrams and analysis you'll understand how an ISL frame is constructed and contents of all fields.

http://www.firewall.cx/networking-topics/vlan-networks/220-vlan-isl-analysis.html

VLAN Tagging - Understanding VLAN Ethernet Frames

Vlan tagging methods. This in-depth analysis will help you understand IEEE 802.1q, ISL, trunk links, untagged & tagged frames, default & management vlan plus much more. Details diagrams and frame analysis will ensure you obtain all the necessary information to master VLANs.

http://www.firewall.cx/networking-topics/vlan-networks/219-vlan-tagging.html

VLAN Access & Trunk Links

This article examines VLAN Links. Understand how Access & Trunk links works, where they are used. Examples of each type of link is provided along with plenty of diagrams to help visualise the differences.

http://www.firewall.cx/networking-topics/vlan-networks/218-vlan-access-trunk-links.html

Introduction to VLANS - The VLAN Concept

This article deals with the VLAN Concept. Understand what a VLAN Network is and how it is implemented. Compare VLAN networks against old traditional flat networks. We also provide detailed diagrams to help understand the covered concepts.

http://www.firewall.cx/networking-topics/vlan-networks/214-vlan-concept.html

Introduction To Network Security - Part 2

Introduction to Network Security - Part 2. Topics covered include: Tools Hackers use, What is Penetration Testing?, Walk-through of an Attack, Reconnaissance & Foot-printing, Privilege Escalation Phase, Clean Up Phase, Presenting reports plus much more.

http://www.firewall.cx/general-topics-reviews/security-articles/853-network-security-intro-p2.html