Re: tunnel interface - does src/dst ip matter?

From: Pat (cui666@gmail.com)
Date: Thu Jan 19 2006 - 21:31:56 GMT-3


Thanks Brian,
one more question: when I tried using loopbacks of the 2 routers as
Tunnel src/dst IPs, it didn't seem to work for me. 2 loopbacks are
reachable to each other (verified with source ping), can you explain?

Thanks,
Patrick

On 1/19/06, Brian Dennis <bdennis@internetworkexpert.com> wrote:
> The source and destination IP addresses or peering interfaces should to
> be a mirror image of each other.
>
> R1: R2:
> Tunnel Source: 1.1.1.1 Tunnel Source: 2.2.2.2
> Tunnel Destination: 2.2.2.2 Tunnel Destination: 1.1.1.1
>
> R1: R2:
> Tunnel Source: Local Lo0 Tunnel Source: Local Lo0
> Tunnel Destination: R2's Lo0 Tunnel Destination: R1's Lo0
>
> HTH,
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Pat
> Sent: Thursday, January 19, 2006 3:50 PM
> To: Group Study
> Subject: tunnel interface - does src/dst ip matter?
>
> Hi, group
>
> From what I understand, the source and destination IPs of a GRE tunnel
> interfaces can be any IPs on the 2 routers as long as they are
> reachable, but one of the labs I am working proved I was wrong, can
> anyone give some insight?
>
> TIA,
> Pat
>
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