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

[Wes Sisk]

If doing NAT or AD it is required.  Otherwise it is still a liability.  
Example:
CSCsw88022    Database should still start and function when DNS is 
unavailable

In this case Informix will not start if configured DNS servers are 
unreachable.

/Wes

On Monday, September 28, 2009 3:33:41 PM, Lelio Fulgenzi 
<lelio at uoguelph.ca> wrote:
> interesting. is the recommendation still to not enable DNS on CUCM 
> servers?
>
> ---
> 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: "Lelio Fulgenzi" <lelio at uoguelph.ca>
> Cc: "cisco-voip mailinglist" <cisco-voip at puck.nether.net>, "Ed 
> Leatherman" <ealeatherman at gmail.com>
> Sent: Monday, September 28, 2009 3:31:18 PM GMT -05:00 US/Canada Eastern
> Subject: Re: [cisco-voip] DNS client on CUCM, Unity servers?
>
> 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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