Cisco Cisco 7815I Media Convergence Server Troubleshooting Guide
This is a list of known DNS problems with Cisco CallManager 3.0(1):
CSCdr64159 (registered customers only) Cisco CallManager does not start if DNS suffix is conf
in Network Ident tab
in Network Ident tab
•
CSCdr43467 (registered customers only) Intracluster calls fail because Cisco CallManager relies
on reverse−DNS entries
on reverse−DNS entries
•
CSCdr66639 (registered customers only) Cisco CallManager does not work with fully qualified
domain names
domain names
•
If you want to use DNS, this is the recommended way to install it:
Configure the DNS server in the TCP/IP Properties Control Panel:
1.
Click the Advanced button, and then click the DNS tab. Make sure the DNS server you entered
appears under the DNS server addresses, in order of use field. Make sure the Append primary and
connection specific DNS suffixes and the Append parent suffixes of the primary DNS suffix
options are checked. Define the DNS suffix for this machine in the DNS suffix for this connection
box. Finally, uncheck the Register this connection's addresses in DNS box.
appears under the DNS server addresses, in order of use field. Make sure the Append primary and
connection specific DNS suffixes and the Append parent suffixes of the primary DNS suffix
options are checked. Define the DNS suffix for this machine in the DNS suffix for this connection
box. Finally, uncheck the Register this connection's addresses in DNS box.
2.
Right−click on My Computer on your desktop, and then select Properties. This dialog box appears:
3.
Click the Properties button. In this box your "Computer name" must match what is configured in
DNS as the hostname for this machine.
DNS as the hostname for this machine.
4.
Click the More button. In the dialog, make sure the Primary DNS suffix of this computer field is
blank and the Change primary DNS suffix when domain membership changes box is unchecked.
blank and the Change primary DNS suffix when domain membership changes box is unchecked.
5.
If any changes are made to the computer name or the dialog, the computer must be restarted. You are
prompted to restart after you answer OK to all the dialogs.
prompted to restart after you answer OK to all the dialogs.
6.
For the Cisco CallManager in question, ensure that the DNS server that contains the hostname
contains both a host entry and a PTR record for the reverse−DNS entry.
contains both a host entry and a PTR record for the reverse−DNS entry.
Note: Without this reverse DNS entry, Cisco CallManager clustering does not work.
7.
If DNS is not used, then ensure that all of the DNS configuration dialog boxes are empty so that the
server does not have any DNS servers configured at all. If the server does contain DNS servers, and if
IP addresses are used as Cisco CallManager names, the server still relies on reverse−DNS.
server does not have any DNS servers configured at all. If the server does contain DNS servers, and if
IP addresses are used as Cisco CallManager names, the server still relies on reverse−DNS.
8.
From the Cisco CallManager Administration web page, complete these steps in order to configure
Cisco CallManager:
Cisco CallManager:
Go to the System > Server menu.
a.
Click on each of the servers and make sure they are either configured as DNS hostnames (not
fully qualified domain names) or IP addresses. In this example, DNS hostnames are used.
fully qualified domain names) or IP addresses. In this example, DNS hostnames are used.
b.
9.
Change the DNS Server and Domain Name in Cisco Unified
Communications Manager 5.x/6.x/7.x
Communications Manager 5.x/6.x/7.x
A DNS server represents a device that resolves a hostname into an IP address or an IP address into a
hostname. If you have a DNS server, Cisco recommends that you enter Yes to enable DNS at the time of
installlation. Disabling DNS limits the system ability to resolve some domain names.In order to change the
DNS server name and domain name follow the below mentioned commands:−
hostname. If you have a DNS server, Cisco recommends that you enter Yes to enable DNS at the time of
installlation. Disabling DNS limits the system ability to resolve some domain names.In order to change the
DNS server name and domain name follow the below mentioned commands:−