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Good points, DNS required for reverse resolution of SIP endpoints.
Most presence deployments will use CUPS which has heavy AD dependence
which will require AD which will necessitate DNS. In short, yes,
presence will likely require DNS as well.<br>
<br>
NAT explanation:<br>
Whatever is configured under system->server is what gets populated
into TFTP configuration files passed to devices. Since there is
nothing out there to fixup XML, and especially encrypted/signed XML
files, the hostname would be passed to endpoint. Endpoint would
attempt DNS resolution. That DNS query would be fixedup to return the
outside IP of CUCM. If you specified an IP under system->server the
endpoint would attempt to contact that IP directly. You could only
redirect/NAT that session if you controlled IP routing in the remote
subnet. DNS fixup is a more friendly/transparent option.<br>
<br>
AD explanation:<br>
AD sync must be configured with servername. Name to IP resolution
requires DNS.<br>
<br>
/Wes<br>
<br>
On Monday, September 28, 2009 3:43:34 PM, Lelio Fulgenzi
<a class="moz-txt-link-rfc2396E" href="mailto:lelio@uoguelph.ca"><lelio@uoguelph.ca></a> wrote:<br>
<blockquote
cite="mid:118551312.9031391254167014822.JavaMail.root@simcoe.cs.uoguelph.ca"
type="cite">
<style type="text/css">p { margin: 0; }</style>
<div
style="font-family: Verdana; font-size: 10pt; color: rgb(0, 0, 0);">Yowza
- Can you elaborate on what you mean by NAT and/or AD? <br>
<ul>
<li>Endpoints doing NAT somewhere out there? Not sure why you'd
need DNS for that.</li>
<li>As for AD, do you mean AD/LDAP integration/synchroniation?</li>
</ul>
I would have though you need DNS for SIP endpoints, presence, etc.<br>
<br>
<br>
<br>
---<br>
Lelio Fulgenzi, B.A.<br>
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>
"Bad grammar makes me [sic]" - Tshirt<br>
<br>
<br>
----- Original Message -----<br>
From: "Wes Sisk" <a class="moz-txt-link-rfc2396E" href="mailto:wsisk@cisco.com"><wsisk@cisco.com></a><br>
To: "Lelio Fulgenzi" <a class="moz-txt-link-rfc2396E" href="mailto:lelio@uoguelph.ca"><lelio@uoguelph.ca></a><br>
Cc: "cisco-voip mailinglist" <a class="moz-txt-link-rfc2396E" href="mailto:cisco-voip@puck.nether.net"><cisco-voip@puck.nether.net></a>, "Ed
Leatherman" <a class="moz-txt-link-rfc2396E" href="mailto:ealeatherman@gmail.com"><ealeatherman@gmail.com></a><br>
Sent: Monday, September 28, 2009 3:40:39 PM GMT -05:00 US/Canada Eastern<br>
Subject: Re: [cisco-voip] DNS client on CUCM, Unity servers?<br>
<br>
<link href="/zimbra/css/msgview.css?v=081117021119" rel="stylesheet">
If doing NAT or AD it is required. Otherwise it is still a liability.
Example: <br>
CSCsw88022 Database should still start and function when DNS is
unavailable <br>
<br>
In this case Informix will not start if configured DNS servers are
unreachable.<br>
<br>
/Wes<br>
<br>
On Monday, September 28, 2009 3:33:41 PM, Lelio Fulgenzi
<a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:lelio@uoguelph.ca" target="_blank"><lelio@uoguelph.ca></a>
wrote:<br>
<blockquote
cite="mid:968576007.9025891254166421807.JavaMail.root@simcoe.cs.uoguelph.ca">
<style>p { margin: 0; }</style>
<div
style="font-family: Verdana; font-size: 10pt; color: rgb(0, 0, 0);">interesting.
is the recommendation still to <span
style="font-weight: bold; font-style: italic; text-decoration: underline;">not</span>
enable DNS on CUCM servers?<br>
<br>
---<br>
Lelio Fulgenzi, B.A.<br>
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>
"Bad grammar makes me [sic]" - Tshirt<br>
<br>
<br>
----- Original Message -----<br>
From: "Wes Sisk" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E" href="mailto:wsisk@cisco.com"
target="_blank"><wsisk@cisco.com></a><br>
To: "Lelio Fulgenzi" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E" href="mailto:lelio@uoguelph.ca"
target="_blank"><lelio@uoguelph.ca></a><br>
Cc: "cisco-voip mailinglist" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E" href="mailto:cisco-voip@puck.nether.net"
target="_blank"><cisco-voip@puck.nether.net></a>, "Ed
Leatherman" <a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:ealeatherman@gmail.com" target="_blank"><ealeatherman@gmail.com></a><br>
Sent: Monday, September 28, 2009 3:31:18 PM GMT -05:00 US/Canada Eastern<br>
Subject: Re: [cisco-voip] DNS client on CUCM, Unity servers?<br>
<br>
yes, but the dependence on DNS will still affect you intermittently.<br>
<br>
/wes<br>
<br>
On Monday, September 28, 2009 3:28:57 PM, Lelio Fulgenzi <a
moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:lelio@uoguelph.ca" target="_blank"><lelio@uoguelph.ca></a>
wrote:<br>
<blockquote
cite="mid:1561852362.9023051254166137273.JavaMail.root@simcoe.cs.uoguelph.ca">
<style>p { margin: 0; }</style>
<div
style="font-family: Verdana; font-size: 10pt; color: rgb(0, 0, 0);">Wes,<br>
<br>
Can we enable DNS but still program the IP address of the CUCM nodes ?<br>
<br>
---<br>
Lelio Fulgenzi, B.A.<br>
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>
"Bad grammar makes me [sic]" - Tshirt<br>
<br>
<br>
----- Original Message -----<br>
From: "Wes Sisk" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E" href="mailto:wsisk@cisco.com"
target="_blank"><wsisk@cisco.com></a><br>
To: "Ed Leatherman" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E" href="mailto:ealeatherman@gmail.com"
target="_blank"><ealeatherman@gmail.com></a><br>
Cc: "cisco-voip mailinglist" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E" href="mailto:cisco-voip@puck.nether.net"
target="_blank"><cisco-voip@puck.nether.net></a><br>
Sent: Monday, September 28, 2009 3:26:26 PM GMT -05:00 US/Canada Eastern<br>
Subject: Re: [cisco-voip] DNS client on CUCM, Unity servers?<br>
<br>
Enabling DNS will affect all operations. It's not a component-wise
defined feature, think all or nothing. <br>
<br>
All code calls gethostbyname(), gethostbyip(),gethostentry().. which
invokes host name resolution features.<br>
<br>
Just make sure:<br>
1. forward resolution for all servers work<br>
2. reverse resolution for all servers work<br>
3. all servers use same dns suffix<br>
<br>
CLI 'set network dns...' is the command set to set and enable dns.<br>
<br>
/Wes<br>
<br>
On Monday, September 28, 2009 3:09:26 PM, Ed Leatherman <a
moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:ealeatherman@gmail.com" target="_blank"><ealeatherman@gmail.com></a>
wrote:<br>
<blockquote
cite="mid:94a1afde0909281209u6f6319f9w6f4f095bc84e3299@mail.gmail.com">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 moz-do-not-send="true"
href="mailto:wsisk@cisco.com" target="_blank">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>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 class="h5"><br>
<br>
On Tuesday, August 18, 2009 1:54:37 AM , ciscozest <a
moz-do-not-send="true" href="mailto:ciscozest@gmail.com"
target="_blank"><ciscozest@gmail.com></a> wrote:<br>
</div>
</div>
<blockquote>
<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>
</div>
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-- <br>
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<br>
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