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

[Wes Sisk]

yes, but the dependence on DNS will still affect you intermittently.

/wes

On Monday, September 28, 2009 3:28:57 PM, Lelio Fulgenzi 
<lelio at uoguelph.ca> wrote:
> 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)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "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
>     <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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>
>
>     -- 
>     Ed Leatherman
>
>
>
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