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IPSEC over GRE not working with NAT, Tunnel Protection

Hi All

I have been trying to get this to work for some time. I cannot get IPSEC to work over GRE, with a NAT device in the middle (router to router). I am using Tunnel protection. I am able to get this to work without a NAT device. I am also able to get this to work with "tunnel mode ipsec ipv4" command. I cannot use this command in production.

When I have this set up, it appears that IPSEC is trying to negotiate with gig int rather than the tunnel interface. What am I missing?

Attached are config snippets, and show outputs.

Any help is greatly appreciated.

thanks,

Alex

1 REPLY
Community Member

Re: IPSEC over GRE not working with NAT, Tunnel Protection

crypto ipsec transform-set LB esp-aes

mode transport

Fixed!

thanks

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