Snort mailing list archives

RES: DNS 53 <-> 53 ?


From: "Marcus Rocha" <mvrocha () brfree com br>
Date: Tue, 17 Jul 2001 11:31:08 -0300

Hi!

This looks like a DNS Server is using a forwarder.  When a DNS
Server cannot
resolve a name from its own zone files or cache, and has a forwarder
configured, it passes the query to the forward lookup server.
Communication
is 53<->53, as you discovered.  This is quite normal behaviour (if both
servers are DNS servers).  If there are no forwarders configured it will
start probing root servers (a.root-servers.net, b.root-servers.net etc),
with similar port information.

Thus, would it be possible to do something with MISC.RULES to ignore inbound
answers with 53<>53 ???

...

Regards,
Marcus


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