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RE: FW: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt

Ronald Bonica <rbonica@juniper.net> Fri, 21 June 2013 22:01 UTC

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From: Ronald Bonica <rbonica@juniper.net>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Subject: RE: FW: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt
Thread-Topic: FW: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt
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Date: Fri, 21 Jun 2013 22:00:41 +0000
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Cc: Ray Hunter <v6ops@globis.net>, "ipv6@ietf.org 6man-wg" <ipv6@ietf.org>
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> -----Original Message-----
> From: Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
> Sent: Friday, June 21, 2013 4:53 PM
> To: Ronald Bonica
> Cc: Ray Hunter; ipv6@ietf.org 6man-wg
> Subject: Re: FW: New Version Notification for draft-bonica-6man-frag-
> deprecate-00.txt
> 
> On 22/06/2013 07:53, Ronald Bonica wrote:
> >> I don't 100% agree. In the case that PMTUD is broken, there'd be
> >> nothing to stop a current DNSSEC implementation from always assuming
> >> a default path MTU of 1280, without awaiting confirmation from
> PMTUD,
> >> and fragmenting the UDP packet pre-emptively [assuming fragmentation
> >> was not equally broken along the path as ICMP PTB was].
> >>
> >
> > Do any implementations actually do this?
> >
> > If they do, how well are they working, today?
> 
> Does it matter? 

Hi Brian,

I think that it does. If a DNSSEC implantation fragments every packet larger than 1280 bytes, regardless of whether that packet needs to be fragmented:

- it ignores the advice of RFC 2460 and RFC 5405
- it doesn't work very well today, because so many operators filter its fragmented output

AFAIKS, there are two ways to make this application work better:

- make people stop filtering IPv6 fragments
- change the implementation's behavior

Given that the former is impossible, it seems that the later is required.

                               Ron

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