Dns Configuration Examples; Verifying The Srv Record; Microsoft Dns Server; Bind 8 & 9 - Cisco TelePresence Administrator's Manual

DNS configuration examples

This section gives examples of DNS configuration using Microsoft DNS Server and BIND 8 & 9.
These examples show how to set up an SRV record to handle H.323 URIs of the form
user@example.com. These are handled by the system with the fully qualified domain name of
vcs.example.com which is listening on port 1719, the default registration port.
It is assumed that both A and AAAA records already exist for vcs.example.com. If not, you will need to
add them.

Verifying the SRV record

There are a range of tools available to investigate DNS records. One commonly found on Microsoft Windows
and UNIX platforms is nslookup. Use this to verify that everything is working as expected. For example:
nslookup -querytype=srv_h323ls._udp.example.com
and check the output.

Microsoft DNS server

Using Microsoft DNS Server you can add the SRV record using either the command line or the MMC snap-in.
To use the command line, on the DNS server open a command window and enter:
dnscmd . /RecordAdd domain service_name SRV Priority Weight
Port Target
where:
domain is the domain into which you want to insert the record
service_name is the name of the service you are adding
Priority is the priority as defined by
Weight is the weight as defined by
Port is the port on which the system hosting the domain is listening
Target is the FQDN of the system hosting the domain
For example:
dnscmd . /RecordAdd example.com_h323ls._udp SRV 1 0 1719
vcs.example.com
BIND 8 & 9
BIND is a commonly used DNS server on UNIX and Linux systems. Configuration is based around two sets
of text files: named.conf which describes which zones are represented by the server, and a selection of
zone files which describe the detail of each zone.
Cisco VCS Administrator Guide (X7.2)
RFC 2782
RFC 2782
Reference material
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