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
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