[dns-operations] G root pmtu?

Wessels, Duane dwessels at verisign.com
Mon Apr 10 14:53:18 UTC 2017

Hi Randy,

I believe this is the archived DNSViz result that shows the problem you observed:


Since the size of the signed 'gn/DS' response is 366 bytes I'm skeptical that it was actually related to PMTU.  More likely a dropped packet for other reasons.  Subsequent tests of the domain don't show the issue.  For example:



> On Apr 9, 2017, at 1:06 PM, Randy Bush <randy at psg.com> wrote:
> http://dnsviz.net/d/gn/dnssec/ whines
>    gn/DS (alg 8, id 38486): No response was received until the UDP
>    payload size was decreased, indicating that the server might be
>    attempting to send a payload that exceeds the path maximum
>    transmission unit (PMTU) size. (2001:500:12::d0d,
>    UDP_0_EDNS0_32768_4096)
> randy
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