named and 127.0.0.2
cpghost at cordula.ws
Mon Dec 29 11:57:25 PST 2003
> I have a bind9 named running on the 4.x stable branch, and have noticed
> that it seems to be sending udp packets to 127.0.0.2:52 about once
> every 10 seconds or so (ipfw is denying and logging the traffic).
> Google has not shed any light on the subject.
127.0.0.2 is often returned by RBLs, when an address is blocked
(a.k.a. listed as spam source):
Quoth the previous URL (mail-abuse.org):
"The theory of operation is simple. Given a host address in its
dotted-quad form, reverse the octets and check for the existence of an
``A RR'' at that node under the blackholes.mail-abuse.org node. So if
you get an SMTP session from [18.104.22.168] you would check for the
22.214.171.124.blackholes.mail-abuse.org. IN A 127.0.0.2
We chose to use an ``A RR'' because that's what Sendmail makes easy to
do. The choice of [127.0.0.2] as the target address was arbitary but
will not change. As it happens, we supply a bogus MAPS RBLSM entry for
[127.0.0.2] so that mail transport developers have something to test
If an ``A RR'' is found by this mechanism, then there will also be a
``TXT RR'' at the same DNS node. The text of this record will be
suitable for use as a reason text for a bounced mail notification.
Currently the text is constant and currently there is no way to use it
from Sendmail, but there it is anyway."
Perhaps you have a mail filter installed, which queries one of those
RBLs, and then tries to do a reverse DNS lookup for 127.0.0.2?
> I've grepped all through /etc/, and have found no references to
> 127.0.0.2, and I certainly don't remember configuring anything (ever)
> with that particular address.
> What could be the cause of this mysterious bind behavior?
Cordula's Web. http://www.cordula.ws/
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