Creating OCS Access Edge DNS SRV records in BIND

Published 22 April 08 07:25 PM

The OCS deployment guides have step-by-step instructions on creating the necessary DNS SRV records in Windows DNS Server, but what if you're using BIND as your external Internet-facing DNS server?

First you'll need an A record for the external IP address of your Access Edge:

e.g. sip.contoso.com -> 192.168.0.1

And you'll need the relevant SRV records for federation and remote user access:

e.g. _sipfederationtls._tcp.contoso.com and _sip._tls.contoso.com

So what should these look like in BIND?

_sipfederationtls._tcp.contoso.com. 86400 IN SRV 0 0 5061 sip.contoso.com.

_sip._tls.contoso.com. 86400 IN SRV 0 0 443 sip.contoso.com.

If we break that down:

_sipfederationtls._tcp.contoso.com. - that is the SRV record name. Notice the '.' on the end.

86400 - that is the TTL, in seconds.

IN - class

SRV - the record type

0 - priority

0 - weight

5061 - port number

sip.contoso.com. - the A record of the Access Edge. Notice the '.' on the end.

More information on this at http://www.zytrax.com/books/dns/ch8/srv.html

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by jkruse
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# Mohamed said on June 13, 2008 5:07 PM:

what about the FQDN's of the webconferencing and A/V edge, do i have to creat DNS A-Record for them as well??, i dont think so, but just wanna make sure

# jkruse said on June 16, 2008 9:42 PM:

Actually these will require A records as well.  Sorry I left them out of this post - this was intended more as an example of the SRV records only.

Here are some of the other DNS requirements (from the OCS Planning Guide):

An external A record that resolves the external Web farm FQDN to the external IP address of the reverse proxy. The client uses this record to connect to the reverse proxy.

An external DNS A record that resolves to the external name of the Web Conferencing Edge Server to the external IP address of the Web Conferencing Edge Server.

An external DNS A record that resolves the external FQDN of the A/V Edge Server to the external IP address of the A/V Edge Server. This IP address must be a publicly routable IP address.

The planning guide can be downloaded from http://technet.microsoft.com/en-us/library/bb676082.aspx

Cheers,

Johann

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