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TANDBERG D13691.03 user manual Appendix Configuring DNS Servers, Microsoft DNS Server, Bind 8

Models: D13691.03

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TANDBERG Border Controller User Manual

AAppendix: 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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TANDBERG D13691.03 user manual Appendix Configuring DNS Servers, Microsoft DNS Server, Verifying the SRV record, Bind 8
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D13691.03 specifications

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