[CUCM] Change DNS server IP

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09-19-2016 01:22 AM - edited 03-19-2019 11:36 AM
Hello,
How can I change the DNS server IP on the CUCM? Can i change it over the Web Gui ?
Regards,
Fird
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09-19-2016 01:44 AM
you cannot change DNS IP thru GUI, CLI is the only option
Refer below command
set network dns
This command sets the IP address for the primary or secondary DNS server.
set network dns { primary | secondary } ip-address
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/cli_ref/8_6_1/cli_ref_861.html#pgfId-39980
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09-19-2016 01:59 AM
Hi Mohammed,
Thanks.
What i need to do in case to change the DNS ?
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09-19-2016 02:06 AM
set network dns primary 4.2.2.2
Command will overwrite the existing DNS Server IP.
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09-21-2016 02:46 AM
Do i need to reboot the CUCM service?
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09-21-2016 03:12 AM
Reboot is not required,
this command causes a temporary loss of network connectivity. If you change the IP address of the DNS server, you must restart Cisco Tomcat.
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08-06-2018 04:11 AM
Does this mess around with the license side of things? DNS change should be pretty straight forward right?
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08-06-2018 07:35 AM
Only if you're running 8.x and below it would change the licenses.
java
if this helps, please rate
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09-11-2018 10:16 PM
Do you know if we have to restart all services or just tomcat?
We simply want to point our Cucm10x to a new internal DNS server.
Thanks Adam
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09-19-2016 03:45 AM
Changing the DNS settings may cause the server to reboot. It will also affect the license MAC that licenses are tied to.
GTG
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11-05-2018 09:18 PM
Im talking about changing the DNS of the interface of call manager. I don't understand how that would be tied into licensing? I would have thought it was just using DNS to resolve other servers in the cluster.
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11-05-2018 09:21 PM - edited 11-05-2018 09:21 PM
Example:
admin:show network eth0
Ethernet 0
DHCP : disabled Status : up
IP Address : 1xx.xx.1.x IP Mask : 255.255.255.000
Link Detected: yes Mode : Auto disabled, Full, 1000 Mbits/s
Duplicate IP : no
DNS
Primary : 1.1.1.1 Secondary : 2.2.2.2 ( I JUST WANT TO CHANGE THESE)
Options : timeout:5 attempts:2
Domain : adam.com.au
Gateway : 1xx.xx.1.1 on Ethernet 0
Do i only need to restart Tomcat for this?
Cheers
Adam
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11-15-2018 08:21 AM
Just found a customer that never set it on some subs and was doing research but yes it will interfer with licensing per cisco documentation below. I believe this is only 8.x but not 100%.
Usage Guidelines
If Cisco Unified Communications Manager or Cisco Unity Connection is installed on VMware, the set network dns primary command changes the calculated value of the license MAC and invalidates the Unified CM or Connection license.
For more information about replacement Unified CM licenses, see the section “Obtaining Rehosted Licenses When You Change License MAC Parameters” in the Installing Cisco Unified Communications Manager Release 8.0(2) guide at http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/install/8_0_2/install/cmins802.html#wp524389.
For information about replacement Connection licenses, see the “Managing Licenses in Cisco Unity Connection” chapter of the System Administration Guide for Cisco Unity Connection at http://www.cisco.com/en/US/products/ps6509/prod_maintenance_guides_list.html .
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05-10-2019 08:48 AM
Hi Adam,
do I need to remove and add PLM instance instance and reboot cluster for this DNS IP address change?
I am using CUCM 10.5 version
"DNS
Primary : 1.1.1.1 Secondary : 2.2.2.2 ( I JUST WANT TO CHANGE THESE)
Options : timeout:5 attempts:2
Domain : adam.com.au
Gateway : 1xx.xx.1.1 on Ethernet 0"
Please confirm!!!
Thanks,
Ganesh
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05-10-2019 09:19 AM
You only need to add/remove the PLM instance if the IP Address and/or hostname changed on the server it is referencing.
