[cisco-voip] DNS client on CUCM, Unity servers?

[Lelio Fulgenzi]

Wes, 

Can we enable DNS but still program the IP address of the CUCM nodes ? 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
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"Bad grammar makes me [sic]" - Tshirt 


----- Original Message ----- 
From: "Wes Sisk" <wsisk at cisco.com> 
To: "Ed Leatherman" <ealeatherman at gmail.com> 
Cc: "cisco-voip mailinglist" <cisco-voip at puck.nether.net> 
Sent: Monday, September 28, 2009 3:26:26 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [cisco-voip] DNS client on CUCM, Unity servers? 

Enabling DNS will affect all operations. It's not a component-wise defined feature, think all or nothing. 

All code calls gethostbyname(), gethostbyip(),gethostentry().. which invokes host name resolution features. 

Just make sure: 
1. forward resolution for all servers work 
2. reverse resolution for all servers work 
3. all servers use same dns suffix 

CLI 'set network dns...' is the command set to set and enable dns. 

/Wes 

On Monday, September 28, 2009 3:09:26 PM, Ed Leatherman <ealeatherman at gmail.com> wrote: 


Follow-up question about DNS.. 

Originally I did not enable DNS on any nodes, as it was not needed. I would now like to configure an SMTP server for alerts, and our systems group wants me to use a name instead of IP. Are there any ramifications to turning on DNS, regarding things like database replication or intracluster communications? My servers are all defined by IP addresses, so it should be using that through-out, right? 

I'm assuming various "set network dns*" commands will turn this on if I decide to do that. 


On Tue, Aug 18, 2009 at 10:46 AM, Wes Sisk < wsisk at cisco.com > wrote: 



On the surface this seems an odd question so I'm sure there is misunderstanding. 

CM needs access to DNS to perform forward and reverse lookups on: 
SIP endpoints 
h323 endpoints 
AD servers 
other nodes in the cluster 

There are deployments which do not use any of these and therefore do not need access to a DNS server. On those, DNS can be disabled. 

/Wes 



On Tuesday, August 18, 2009 1:54:37 AM , ciscozest <ciscozest at gmail.com> wrote: 






We have 3 CUCM 7.0 servers and only one Unity Connection 7.0 server. 

We use a load balancer for IP Phone services redundancy. There is no integration with any third party components. When I check our UC system, I found out that DNS client service is enabled on both CUCM and Unity servers which I don’t quite understand why is needed. The Services URL on CUCM is pointing to load balancer IP. Would there be any other reason we have to enable DNS client on CUCM and Unity server? Also is there a load impact by enabling DNS client service? 



Thank you. 
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-- 
Ed Leatherman 



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