Where would you suggest putting the GRE tunnel source on a router that is NATing? the IP NAT OUTSIDE interface as the source or the IP NAT INSIDE interface as the source? Just wondering because both work. Is there a proper way? Thanks for your input!
You can specify the specific route to 172.16.2.0 /24 traffic via tunnel 0.
(i just put the route in general).
So let the traffic nat the normal traffic going to internet via PAT (overloading the s0 interface ip address) while the tunnel doesnt need to nat, because packets are tunnelled (encapsulated inside) a packet with source and destination IP addresses, which are public routable ip addresses.
So the only change in my above configuration would be the specific routes to the 172.16.1.0/24 and 172.16.2.0/24 routes. You dont need default route pointing to tunnel interface in this case.
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