From: Tom Holloway (Tom_holloway@xxxxxxxxxxxxxx)
Date: Wed Oct 03 2001 - 10:03:53 GMT-3
see inline
> -----Original Message-----
> From: Khurram Khani [SMTP:kkhani@nortelnetworks.com]
> Sent: Tuesday, October 02, 2001 1:20 AM
> To: 'ccielab@groupstudy.com'
> Subject: GRE Tunnel -few questions
>
> Hi ,
>
> I was working on learn GRE Tunnels..
>
> Have few questions in my mind after configuration.
>
> 1. Significance of tunnel source ip:
>
> Is this IP just used as Source IP for any packet originating from Tunnel
> Interface or
> a tunnel also listens on Source IP to catch any GRE packets coming in.
> What
> I mean
> is, when a GRE packet comes on a Logical or physcial interface , how it
> actually
> reaches to tunnel interface?
[Tom Holloway] GRE encapsulates whatever protocol you are
tunnelling in IP for instance, so the IP packet carrying your protocol
packet has a source and destination of the tunnel endpoints.
> 2. R1----- R2
>
> Does tunnel destination of R1 must be tunnel source of R2?? Or R2 can
> have
> different
> tunnel source?
[Tom Holloway] please see answer to 1
> 3. When i put the tunnel source and tunnel destination, line protocol goes
> up ! even there
> is no tunnel configure on the other side?? So does a router do some
> kind
> of a Routing
> table look for reachbility rather than a two-way handshake?
[Tom Holloway] the tunnel is a logical entity so doesn't have
keepalives etc
> Help from Gurus appreciated.
>
> Thanks
> Khurram
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