Re: Pubstro rash

[Valdis.Kletnieks () vt edu]

On Fri, 18 Mar 2005 09:30:51 CST, Joshua Berry said:
> I have never had a DNS query that had a response that was over 512
> bytes.  For that reason I disable all inbound DNS over 53/tcp.

Inquiring minds want to know - how do you *know* you never had a response
that was over 512 bytes? :)

(Remember - if you have EDNS0 support, you won't notice that the reply was over
512 bytes, and if you don't, it's usually likely that the incomplete response
after being truncated to 512 bytes still has enough info to mostly work.  Sure,
you may only get info on 8 of AOL's farm of MX hosts, and lose the rest because
you don't have a TCP connection - but hopefully 1 of those 8 answers anyhow.
And if it doesn't, the *next* time you try, AOL will likely hand you a different
set of round-robined addresses, and one of the new ones answers.  So all you see
from the truncation is that things burp for a while).

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