query about EDNS UDP Packet

Sten Carlsen stenc at s-carlsen.dk
Mon Dec 31 15:47:56 UTC 2012

With the replies you have shown, the limitation is very likely within
your own walls.

While it is possible that some router on the path between you and the
test server limits the packet size, I would say it is very likely not
the case, much less than 1% propability - according to my experience.

I would use a sniffer along the path between each
switch/router/firewall/xx until you either don't see the longer edns0
packets or some other evidence (could be some ICMP message) shows you
that this is the place.

I would also search for keywords like: DNS EDNS0 truncate.

Good hunting.

On 31/12/12 15:07, Phil Mayers wrote:
> On 12/31/2012 10:54 AM, Gaurav Kansal wrote:
>> I just want to test whether this limit is within my organization.
>> Is any method available by which I can check this?
> https://www.dns-oarc.net/oarc/services/replysizetest
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Best regards

Sten Carlsen

No improvements come from shouting:

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