DNS Flood -- Help!

Barry Margolin barmar at genuity.net
Wed Jan 9 18:17:49 UTC 2002


In article <a1hrc2$595 at pub3.rc.vix.com>,
William Stacey <staceyw at ameritech.net> wrote:
>Question.  The query-source port is a high-numbered (i.e. ephemeral) port
>with a query to a DNS server.  Is the reply guaranteed to come back from
>source port 53 to the ephemeral port?  Is it possible the "reply" service
>itself would use an ephemeral port?

Yes.  The source port of a DNS reply always matches the destination port of
the query.

-- 
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.


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