From: CCIEin2006 (ciscocciein2006@gmail.com)
Date: Thu Nov 10 2005 - 15:11:09 GMT-3
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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