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TANDBERG Border Controller User Manual
A Appendix: Configuring DNS Servers
In the examples below, we 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 gatekeeper1.example.com
which is listening on port 1719, the default registration port.
It is assumed that an A record already exists for gatekeeper1.example.com. If not, you will need
to add one.
A.1 Microsoft DNS Server
It is possible to 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 service data
Where domain is the domain into which you wish to insert the record, service name the name
of the service you’re adding and service
data the priority, weight, port and server providing the
service as defined by RFC 2782. For example:
dnscmd . /RecordAdd example.com
h323ls. udp SRV 1 0 1719 gatekeeper1.example.com
A.1.1 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.
BIND is sometimes run chrooted for increased security. This gives the program a new root
directory, which means that the configuration files may not appear where you expect them to be.
To see if this is the case on your system, run
ps aux grep named
This will give the command line that named (the BIND server) was invoked with. If there is a -t
option, then the path following that is the new root directory and your files will be located relative
to that root.
In /etc/named.conf look for a directory entry within the options section. This will give the directory
in which the zone files are stored, possibly relative to a new root directory. In the appropriate
zone section, a file entry will give the name of the file containing the zone details.
For more details of how to configure BIND servers. and the DNS system in general see [6]
A.2 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
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