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IPSec over GRE why ?

To: <ipsec@xxxxxxxxxxxxxxxxx>
Subject: IPSec over GRE why ?
From: "Sandeep Sakhuja" <ssakhuja@xxxxxxxxx>
Date: Tue, 25 Feb 2003 11:42:35 +0530
Importance: Normal
Reply-to: <ssakhuja@xxxxxxxxx>
Sender: owner-ipsec@xxxxxxxxxxxxxxxxx

Hi

I am Sandeep. I am working on implementing IPSec lab. When implementing IPSec
across different routing domains we need to use GRE or IIPTran. My Question is
why do I have to use the same. IPSec does not support multicast packets that is
known, but then my interesting traffic which I need to be protected is not the
routing updates, so why do I have to use GRE ?

Thanks
- Sandeep

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