Re: Overlapping Networks with Tunnel GRE/IPsec and NAT
Thanks. I already checked this paper. The problem is that it only talks about IPsec and not about GRE/Ipsec and nating on a Tunnel interface.
However I made some tests in the lab and it worked fine. So I went back to the customer-site and I had to reboot the small 836 to get it working.
What I learnedis : "ip nat outside" on a tunnel interface on a Cisco 836 is no problem. This is good news if you have to add partners companies with GRE/IPsec and they don't have IP ranges you like, so you just NAT them and give them IP addresses of your choice.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...