Saturday, January 27, 2018

Issue with VTI on Cisco router

Hello,

I setup simple lab environment in GNS3 and found interesting problem. Used setup from https://www.cisco.com/en/US/docs/ios/12_3t/12_3t14/feature/guide/gtIPSctm.html#wp1080079 (Configuration Examples for IPsec Virtual Tunnel Interface). So in this simple setup, tunnel interface is UP, from the router I can ping everything, but from the server on left and right side I can't ping tunnel endpoint or LAN IP of the other router. I have no idea why, it's totally not logical, servers are using LAN IP as default gateway.



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