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Re: L2TP over IPSec

To: Pyda Srisuresh <srisuresh@yahoo.com>
Subject: Re: L2TP over IPSec
From: "W. Mark Townsley" <townsley@cisco.com>
Date: Tue, 18 Jan 2000 18:16:53 -0800
CC: David Wong <David_Wong@notes.teradyne.com>, l2tp@ipsec.org, ipsec@lists.tislabs.com
References: <20000118021144.23584.qmail@web1405.mail.yahoo.com>
Sender: owner-ipsec@lists.tislabs.com


Copying ipsec.

Pyda Srisuresh wrote:
> 
> --- "W. Mark Townsley" <townsley@cisco.com> wrote:
> >
> > Transport mode is encouraged.
> >
> > Can you identify a case where tunnel mode would be absolutely necessary?
> >
> 
> When L2TP tunnel end point is a tunnel mode IPsec gateway.
> It is easy for a VPN/IPsec gateway to implement tunnel mode IPsec for L2TP
> tunnels. Having to implement transport mode for L2TP is a bit of stretch
> for the security gateway.

Details please? Why is transport mode more difficult than tunnel mode? 

> 
> cheers,
> suresh
> 
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