query about EDNS UDP Packet

Mike Hoskins (michoski) michoski at cisco.com
Wed Jan 9 20:02:36 UTC 2013

-----Original Message-----

From: Gaurav Kansal <gaurav.kansal at nic.in>
Date: Wednesday, January 9, 2013 12:34 AM
To: Sten Carlsen <stenc at s-carlsen.dk>, "bind-users at lists.isc.org"
<bind-users at lists.isc.org>
Subject: Re: query about EDNS UDP Packet

>Thanks for help.
>My Firewall was dropping packet size larger than 512 bytes.
>Cisco 5580 having ASA 8.3. It is by default blocking my EDNS0 Packet.

This should be a FAQ.  :-)

For anyone else who happens to be reading the archives -- googling for
"cisco edns0" will lead to a lot of useful information...better than
duplicating it all here.  Many older network devices (including Cisco) had
default policies which assumed a 512 byte limit.

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