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Site-to-Site IKEv2 IPSec VPN using Pre-Shared Key Authentication - simple configuration example for two Cisco routers - NIL - Network Information Library
Example for Configuring the Headquarters (Cisco Router) to Manage Branches Using Efficient VPN and Establishing IPSec Tunnels - AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 CLI-based Typical Configuration Examples -
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L2TP (Layer 2 Tunnel Protocol) :: Chapter 11. VPN Technologies, Tunnel Interfaces, and Architectures :: Integrated cisco and unix network architectures :: Networking :: eTutorials.org
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