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Re: Path MTU Discovery

"Angelos D. Keromytis" <angelos@aurora.cis.upenn.edu> Tue, 11 February 1997 12:44 UTC

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Date: Tue, 11 Feb 1997 07:44:54 -0500
Message-Id: <9702110403.AA85679@aurora.cis.upenn.edu>
To: Ran Atkinson <rja@inet.org>
Cc: Ben Rogers <ben@ascend.com>, Dan McDonald <Dan.McDonald@Eng.sun.com>, ipsec@tis.com
Subject: Re: Path MTU Discovery
From: "Angelos D. Keromytis" <angelos@aurora.cis.upenn.edu>
Sender: owner-ipsec@ex.tis.com
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In message <Chameleon.855633160.rja@c8-a.snvl1.sfba.home.com>, Ran Atkinson wri
tes:
>
>  In effect, ESP tunnel mode uses the outer IP as a link-layer.  Copying
>DF bit is not prohibited for IPsec tunneling, but neither is it required
>for IPsec tunneling.

I think that, if not mandate copying the DF bit, the new drafts should
at least present the benefits of doing so and provide guidelines to
anyone who wants to have his implementation allow PathMTU. Or it could
be a separate document altogether.
- -Angelos

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