There was a fix to the way that the PowerDNS recursor returns UDP replies. The fix changed the behavior of the recursor so that it would return as much information as it could in a single UDP packet, this should be sufficient for nearly all applications (read, I can't think of a situation where it would be a problem). Initially if a domain administrator configured a very large number of MX records for their domain (earthlink was where I ran into the issue) then reply would be too large to send in a UDP packet. The reply would be truncated and you get the behavior that you're seeing. You can work around this by allowing your recursor to answer TCP queries, or upgrade to a later version of the PowerDNS recursor that includes the fix.
Tony Adams Sr. Systems Engineer E Solutions Corporation > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:pdns-users- > [EMAIL PROTECTED] On Behalf Of John Williams > Sent: Tuesday, August 15, 2006 2:22 PM > To: [email protected] > Subject: [Pdns-users] Host looks causing issues > > I've encountered a problem that seems to have been caused by PDNS. > A number of emails being sent are failing after retries this is because > the > MX lookups are having issues. > For instance: > > > # host -t mx tiscali.co.uk > ;; Warning: Message parser reports malformed message packet. > ;; Truncated, retrying in TCP mode. > ;; connection timed out; no servers could be reached > > > I know the MX records exist since I can do an MX lookup on another server > not using our PDNS server to do the lookup via. > Any ideas how I can get around this issue? > > We are running version 2.9.18 > > > Thanks > John > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.405 / Virus Database: 268.10.9/417 - Release Date: 11/08/2006 > > > _______________________________________________ > Pdns-users mailing list > [email protected] > http://mailman.powerdns.com/mailman/listinfo/pdns-users _______________________________________________ Pdns-users mailing list [email protected] http://mailman.powerdns.com/mailman/listinfo/pdns-users
