Yeah, and what Kevin said :) Another example for why friends don't let friends use more than one PTR per IP address.
----- Original Message ---- From: Kevin Darcy <k...@chrysler.com> To: bind-us...@isc.org Sent: Thursday, July 9, 2009 12:35:54 PM Subject: Re: Truncated, retrying in TCP on Reverse lookup The SERVFAIL/timeout is probably because the original poster's firewall is misconfigured and doesn't allow TCP DNS transactions. - Kevin Fr34k wrote: > Hello, > As I understand it, there are so many PTRs for that IP address, that DNS >will change protocol from UDP to TCP. > So, the message you are getting is informational because of this protocol > change. > See the long list of PTRs below. > There should be one and only one PTR for that IP. > Making an SMTP connection to that IP address results in that host saying that > it calls itself "minserv.co.za" > Therefore, there should be only on PTR for that IP address with that hostname. > Note that none of the 15 PTRs match this hostname, which is even more silly. > HTH > $ host 196.7.126.38 > ;; Truncated, retrying in TCP mode. > 38.126.7.196.in-addr.arpa domain name pointer www.adventureservices.co.za > <http://www.adventureservices.co.za>. > 38.126.7.196.in-addr.arpa domain name pointer mail.penoc.org.za. > 38.126.7.196.in-addr.arpa domain name pointer mail.travelsense.net. > 38.126.7.196.in-addr.arpa domain name pointer mail.mantlemapper.com. > 38.126.7.196.in-addr.arpa domain name pointer mail.quintessentia.net. > 38.126.7.196.in-addr.arpa domain name pointer mail.datanetsolutions.co.za. > 38.126.7.196.in-addr.arpa domain name pointer mail.spatialdimension.co.za. > 38.126.7.196.in-addr.arpa domain name pointer mail.spatialwebserver.co.za. > 38.126.7.196.in-addr.arpa domain name pointer mail.spatialwebserver.com. > 38.126.7.196.in-addr.arpa domain name pointer mail.adventureservices.co.za. > 38.126.7.196.in-addr.arpa domain name pointer mail.explorationservices.co.za. > 38.126.7.196.in-addr.arpa domain name pointer > spa004-1.cust-gw.za.mtnbusiness.net. > 38.126.7.196.in-addr.arpa domain name pointer www.thewash.co.za > <http://www.thewash.co.za>. > 38.126.7.196.in-addr.arpa domain name pointer www.gisstaff.co.za > <http://www.gisstaff.co.za>. > 38.126.7.196.in-addr.arpa domain name pointer www.cheaprentalcars.co.za > <http://www.cheaprentalcars.co.za>. > telnet 196.7.126.38 25 > Trying 196.7.126.38... > Connected to 196.7.126.38. > Escape character is '^]'. > 220 minserv.co.za Microsoft ESMTP MAIL Service, Version: 6.0.3790.1830 ready > at Thu, 9 Jul 2009 14:45:58 +0200 > rset > q250 2.0.0 Resetting > uit > 221 2.0.0 minserv.co.za Service closing transmission channel > Connection closed by foreign host. > > > ------------------------------------------------------------------------ > *From:* Erisan Nyamutenha <erisan.nyamute...@uct.ac.za> > *To:* bind-users-requ...@lists.isc.org > *Cc:* bind-us...@isc.org > *Sent:* Thursday, July 9, 2009 3:34:09 AM > *Subject:* Truncated, retrying in TCP on Reverse lookup > > Hi All > In order for my email server to accept mail from an external source, it does >a reverse lookup on the source. I have email coming from a sender whose ip >address maps to several hostnames i.e there PTR records pointing to the same >IP. when I try to reverse lookup with my own DNS I get the following >;;Truncated, retrying in TCP mode then eventually I get a time out or server >can't find 38.126.7.196.in-addr.arpa: SERVFAIL. What could this be? > ------------------------------------------------------------------------ > > _______________________________________________ > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
