Follow-up question about DNS.. <br><br>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?<br>
<br>I'm assuming various "set network dns*" commands will turn this on if I decide to do that.<br><br><div class="gmail_quote">On Tue, Aug 18, 2009 at 10:46 AM, Wes Sisk <span dir="ltr"><<a href="mailto:wsisk@cisco.com">wsisk@cisco.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">
On the surface this seems an odd question so I'm sure there is
misunderstanding.<br>
<br>
CM needs access to DNS to perform forward and reverse lookups on:<br>
SIP endpoints<br>
h323 endpoints<br>
AD servers<br>
other nodes in the cluster<br>
<br>
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.<br>
<br>
/Wes<div><div></div><div class="h5"><br>
<br>
On Tuesday, August 18, 2009 1:54:37 AM , ciscozest
<a href="mailto:ciscozest@gmail.com" target="_blank"><ciscozest@gmail.com></a> wrote:<br>
</div></div><blockquote type="cite"><div><div></div><div class="h5">
<p style="margin: 0cm 0cm 0pt;"><font face="Times New Roman" size="3">We have 3 CUCM 7.0 servers and only
one Unity Connection 7.0 server.</font></p>
<p style="margin: 0cm 0cm 0pt;"><font face="Times New Roman" size="3">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?</font></p>
<p style="margin: 0cm 0cm 0pt;"><font face="Times New Roman" size="3"> </font></p>
<p style="margin: 0cm 0cm 0pt;"><font face="Times New Roman" size="3">Thank you.</font></p>
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