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Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop

Joe Touch <touch@isi.edu> Mon, 05 November 2012 03:14 UTC

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From: Joe Touch <touch@isi.edu>
Date: Sun, 04 Nov 2012 19:13:28 -0800
To: Mark Andrews <marka@isc.org>
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Cc: Fernando Gont <fgont@si6networks.com>, "v6ops@ietf.org" <v6ops@ietf.org>
Subject: Re: [v6ops] new draft: draft-taylor-v6ops-fragdrop
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On Nov 4, 2012, at 4:00 PM, Mark Andrews <marka@isc.org> wrote:

> 
> While flow labels work for distributing traffic, they do not work
> for filtering as there is guarentee that fragments will arrive in
> order.  For filtering their need a copy of the headers routers are
> using to filter to be available in all of the fragments.  At a
> minimum this is the UDP header.  TCP should be able to be handled
> with PTB being returned on fragmented packets.  I havn't thought
> about other protocols.

TCP is supposed to react to PTB already. If you're getting fragments in v6 they're generated at the source. Why would PTB not just result in more, smaller fragments?

And what if/when PTB is blocked or dropped by operators like you? 

Joe

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