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

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

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

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