Site to Site VPN between a Cisco Router and Linux Server
I am working on a project to implement a site-to-site VPN between a Linux box and a Cisco router. At first it might seem an easy question but its not that easy because of some requirements and compatibility issues and I working hard on it to figure it out. Currently I am looking into the followings:
- OpenVPN
- Openswan (Seems to be the right choice!)
- StrongSwan
- Frees/WAN
There are online resources explaining how to a establish a site to site VPN between a linux and a Cisco PIX firewall or Cisco VPN Concentrator but not for cisco IOS based routers!



2 Comments:
Because you want site-to-site, so authentication is not needed!!
One solution that I have read on net, is to implement GRE tunnel and for encryption tunnel apply IPSEC.
Of course that is a suggestion :)
All the headache is about the IPSec stack :D
There are different implementation of IPSec stack on linux and OpenSwan is one of them.
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