Side-effects of edns-udp-size 512

Doug Barton dougb at
Tue May 4 00:07:04 UTC 2010

On 05/03/10 17:04, Ray Van Dolson wrote:
> My workflow is as follows:
>     1. We notice slow DNS resolution to a given external domain (either
>        via user complaint or other means)
>     2. Troubleshoot and identify that the given domain's primary
>        nameservers don't properly handle or respond at all to EDNS0
>        enabled queries (probably a network issue).  In addition, this
>        domain may have a fairly low TTL set which makes the problem a
>        bit more visible to end users, especially if it's not queried
>        regularly enough to stay in cache.
>     3. We attempt to contact the domain contacts to get them to fix
>        their configuration.
>     4. If we don't get any response back after multiple tries, we'll
>        typically diable EDNS for this particular domain.

That's a different picture. I think the above is quite reasonable, it's
adjusting the default that I object to.

Sorry for the noise.



	... and that's just a little bit of history repeating.
			-- Propellerheads

	Improve the effectiveness of your Internet presence with
	a domain name makeover!

More information about the bind-users mailing list