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

[Wes Sisk]

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 
> <mailto: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> <mailto: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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>>       
>
>
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>
>
> -- 
> Ed Leatherman
>

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