Re: GRE packet structure and order of operations

From: CCIEin2006 (ciscocciein2006@gmail.com)
Date: Fri Nov 11 2005 - 10:45:07 GMT-3

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Anyone want to take a stab at this?

On 11/10/05, CCIEin2006 <ciscocciein2006@gmail.com> wrote:
>
> Hi folks,
> Can someone kindly provide some clarification on how GRE works:
> 1. Where does the IP address of the Tunnel interface appear in the
> packet?
> 2. Anyone have a good link showing a GRE packet with all the source and
> destination IP addresses (in the encapsulated IP packet, GRE header, and
> transport IP header?)
> 3. If possible explain step by step the order of operations i.e step 1 the
> packet is routed to the tunnel interface, step 2 the encapsulated packet is
> routed out the physical interface with the source IP changed to the tunnel
> source IP, etc...
> Thanks!

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