Truncated, retrying in TCP on Reverse lookup

[Kevin Darcy]

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.Nyamutenha at uct.ac.za>
> *To:* bind-users-request at lists.isc.org
> *Cc:* bind-users at 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?
>  
> ------------------------------------------------------------------------
>
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