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Re: [DNSOP] are there recent studies of client side/ISP firewalls interfering with EDNS?

Nicholas Weaver <nweaver@icsi.berkeley.edu> Thu, 12 November 2015 16:47 UTC

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From: Nicholas Weaver <nweaver@icsi.berkeley.edu>
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Date: Thu, 12 Nov 2015 08:46:55 -0800
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References: <D26A217F.1E6DC%gwiley@verisign.com> <B66E268E-866C-4C47-BB93-7D2D41FDC8D1@icsi.berkeley.edu> <20151112104340.4ebb742a@localhost>
To: John Kristoff <jtk@cymru.com>
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Cc: "Wiley, Glen" <gwiley@verisign.com>, "dnsop@ietf.org" <dnsop@ietf.org>, Nicholas Weaver <nweaver@icsi.berkeley.edu>
Subject: Re: [DNSOP] are there recent studies of client side/ISP firewalls interfering with EDNS?
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> On Nov 12, 2015, at 8:43 AM, John Kristoff <jtk@cymru.com> wrote:
> 
> On Thu, 12 Nov 2015 08:00:50 -0800
> Nicholas Weaver <nweaver@icsi.berkeley.edu> wrote:
> 
> After a DNS over TCP discussion a student of mine indicated that they
> recently fixed a problem in their network where DNS messages over 512
> bytes were not being relayed.  It appears the root cause has to do with
> some defaults being set common gear that simply drops messages over 512
> bytes.  For example:

This is an issue but its relatively rare.  Often the bigger problem is fragmentation support.

--
Nicholas Weaver                  it is a tale, told by an idiot,
nweaver@icsi.berkeley.edu                full of sound and fury,
510-666-2903                                 .signifying nothing
PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub.asc

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