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
