On Fri, Mar 1, 2013 at 2:04 PM, krishna kumar <ipow...@yahoo.com> wrote:
> Thanks for your reply!
> Not sure if I understood what you said correctly... please correct me if I'm
> wrong.
> The two subnets are each behind a router which has a public IP.
> Then the 10.x.x.x has a GRE tunnel interface with remote ip of 108.x.x.x and
> vice versa.
> I have also setup a DNAT in the firewall to forward any packet to 108.x.x.x
> with protocol 47 to 192.168.x.x (VM).
> And I also added a flow that says any traffic from 10.x.x.x to 192.168.x.x
> should goto GRE tunnel interface.
> It seems it is working fine. The ICMP request from 10.x.x.x to 192.168.x.x
> is getting encapsulated and the GRE packets are received on the 192.168.x.x
> network. But the ICMP reply is not generated on the 192.168.x.x side.
>
> Not sure where we would need another router between these two subnets.

I don't understand why you are using NAT here.  Isn't 108 the subnet
of the GRE endpoint and 192.168 the subnet of the host inside the
tunnel?
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