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Split DNS and External web - 19.Jun.2007 11:04:34 AM

TrevorW

Posts: 3
Joined: 7.Apr.2005
From: United Kingdom, Milton keynes
Status: offline

Hi Folks ('specially Tom ;-))
After reading Toms article on Split DNS and having a requirement to publish OWA for local and external users I have implemented same and all basically OK.

Only problem is that the domain has an external website. This needs to be accessed by internal and external users too.

So I have SBS2003R2 premium with Exchange2003 and ISA2004 deployed (two NICs 192.168.3.1 internal and 192.168.100.251 External). The local domain name is XXX.local and the external domain name is YYY.com.

I have setup a Host A record in the public DNS to create server.YYY.com and pointed it at the public IP of the network concerned 11.22.33.01. I have also added the new zone as instructed by Tom in his article. The zone is YYY.com and has Host A record for 'server' pointing to the local IP of the SBS server (192.168.3.1)

I've run the ICW and allowed the certificates to be named and created. All works for OWA using https://server.YYY.com/exchange. The problem is I have an external website at www.YYY.com and need both internal and external users to have access to it.

Is this scenario practical with a split DNS as above ?
If so how does one resolve to the external IP for www.YYY.com internally ??

I'm not an expert DNSer but learning like the clappers, if anyone can speed the learning process I'd appreciate it.

Regards
Trevor

Post #: 1

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RE: Split DNS and External web - 19.Jun.2007 11:35:46 AM

Rotorblade

Posts: 1002
Joined: 27.Feb.2007
Status: offline

Hi Trevor,

Create a A host record "www" in your local "YYY.com" zone and use the external's website IP. Internal clients and ISA will be able to resolve your external website IP with a local lookup.

HTH
Regards,
RB

(in reply to TrevorW)

Post #: 2

RE: Split DNS and External web - 20.Jun.2007 5:24:21 AM

TrevorW

Posts: 3
Joined: 7.Apr.2005
From: United Kingdom, Milton keynes
Status: offline

Hi RotorBlade,
Yeah that seemed like the sensible way forward but I was concerned with internal/external consistency. However, accepting that its not an ideal solution anyway, I had a bash.

Adding the www to the YYY.com zone as 81.21.75.29 (this just for test purposes and relates to www.whytec.com my ISP gave the IP) results in a warning stating that :

"The associated pointer (ptr) record cannot be created, probably because the referenced reverse lookup zone cannot be found."

The A record appears in the forward lookup table though. If I use nslookup to see if resolution is working the correct IP is returned. But if I use IE to browse to www.whytec.com I get an HTTP 404 error.

I feel there is something fundamental that I'm not appreciating here, can you or any others help ???

Thanks
Trevor

(in reply to Rotorblade)

Post #: 3

RE: Split DNS and External web - 20.Jun.2007 6:33:17 AM

TrevorW

Posts: 3
Joined: 7.Apr.2005
From: United Kingdom, Milton keynes
Status: offline

Hi RotorBlade,
With your help things have taken a turn for the better (ho ho

) . . . sorry about that.

The ISP gave me the wrong IP and after flushing the DNS cache I can now resolve www.YYY.com using the A record entry that you mentioned.

Thanks for your help.

(in reply to TrevorW)

Post #: 4