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Re: Interesting BIND error

  • From: Vinny Abello
  • Date: Thu Feb 12 17:49:42 2004

At 05:31 PM 2/12/2004, Brian Bruns wrote:

On Thu, February 12, 2004 4:52 pm, Brian Wallingford said:
> We've been seeing the following on all of our (9.2.1) authoritative
> nameservers since approximately 10am today.  Googling has turned up
> nothing;  I'm currently trying to glean some useful netflow data.  Just
> wondering if this is local, or if others have suddenly seen the same.
> Seems harmless enough, but the logging is eating a disproportionate amount
> of cpu.
> Feb 12 16:25:07 ns1 named[3150]: internal_send:
> Invalid argument

Its possible that someone is spoofing UDP packets to your nameserver from
that IP range (which is IANA reserved space).  It looks like BIND is
refusing to send to that address, and thus the error.

At least, IMHO.  So I could be wrong :)
Someone is likely using on their mail server which is resolving against your DNS server. It is a now defunct blacklist. They changed all their records to resolve to in order to get people's attention and get them to stop using the service. You should filter on your BIND servers anyway. Alternatively, you can just create an authoritative zone for on your servers and leave them blank except for required records like SOA and NS. There is a small discussion going on about this on the bind9-users list and this information is strictly pulled from there. You might want to check that list out or similar ones for more information.

Vinny Abello
Network Engineer
Server Management
[email protected]
(973)300-9211 x 125
(973)940-6125 (Direct)
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