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Getting reverse DNS Error in validate_network test

I am in the process of changing the ip addresses of my publisher/subscriber/unity servers (I have one of each).  Have to move them to a new subnet.  Since I am new to UCM, I would rather change the IP than reinstall/reconfigure everything.

In the changing IP address document for 9.1(1), it mentions running the validate_network rest.  When I ran it the first time, I the following error -

10-16-2013 10:23:12 validate_network:     Hostname: [CM-Publisher]

10-16-2013 10:23:12 validate_network:     found pub name [CM-Publisher]

options: q=quit, n=next, p=prev, b=begin, e=end (lines 21 - 40 of 42) :

10-16-2013 10:23:12 validate_network:     result: 7, message: Reverse DNS lookup mismatch

I went to the DNS server and found that there wasnt a Reverse DNS entry for the Call Manager server.  I fixed that problem and re-ran the test.

Still got the same error.  What should I look at next or can I ignore this ?  All the both of the UCM servers and unity are configured using ip address only.

Ron                  

5 REPLIES

Getting reverse DNS Error in validate_network test

Make sure the DNS server specified in UCM has the reverse DNS zone configured. Does the reverse lookup work from your PC? Does the domain on UCM match with what you have specifed on the DNS server?

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New Member

Getting reverse DNS Error in validate_network test

I ran a test of reverse dns and got these results -

rnutter@rnutter-VirtualBox:~$ host 10.34.150.100
100.150.34.10.in-addr.arpa domain name pointer cmpub.my-forest.local.
100.150.34.10.in-addr.arpa domain name pointer cm-publisher.my-forest.local.
100.150.34.10.in-addr.arpa domain name pointer cm-publisher.
rnutter@rnutter-VirtualBox:~$

could multiple records coming back be the cause of the problem ?

Ron

Getting reverse DNS Error in validate_network test

Yep, definitely.  Make sure the domain returned here matches your domain in UCM.

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New Member

Re: Getting reverse DNS Error in validate_network test

Not using a domain in UCM that I am aware of.  The person that helped me do the setup had me use only ip addresses for the publisher, subsciber and unity.

Took out both of the A records and the PTR records, refreshed the MS DNS server, put the A record back in.  It automatically created the PTR record.  The test passed in a matter of seconds instead of churning for 10 minutes.

Ron

Getting reverse DNS Error in validate_network test

Ron, if you have to specify DNS servers, you will have to specify a domain name. The domain name can be found by issuing show network eth0 after SSH-ing into the server. You can also get it from Cisco OS admin webpage.

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