DNS Server on xDSL

From: CraigC (CraigC_at_discussions.microsoft.com)
Date: 12/13/04 

Date: Sun, 12 Dec 2004 22:31:01 -0800

Really hope someone can help here.

I have a SDSL service with a static IP address. The service has a single IP
address and we use port forwarding at the firewall to route traffic to the
appropriate Win2K servers.

Our business requires that we be able to test web and email services and for
this we need to maintain our own DNS server. I have established a DNS server
on a Win2K box in the DMZ on a private address subnet and forwarded UDP and
TCP ports 53 to the server. The external IP address has been registered as a
DNS
service. I have set up a couple of test domains and created host entries and
correctly delegated the domains to our external IP address. If I ping these
hosts from the Internet, the returned address correctly identifies our
external IP address. Web servers on the private network are correctly
accessible by name from the Internet (port 80 is also forwarded). This
implies that the server is correctly responding.

My problem is this. Email doesn't work (port 25 is forwarded). I have
created mail.domainname.com zones and corresponding MX records. The mail
host is pingable from the 'net. Email sent to any address returns the
following error:

----- The following addresses had permanent fatal errors -----
<account@domainname.com>

----- Transcript of session follows -----

550 5.1.2 <account@domainname.com>... Host unknown (Name server:
nameserver.com: no data known)

At this point I am stumped. I know I've missed something or misunderstood
something but I can't figure it. Maybe I can't do what I want on a DSL line.
I thought it might be something to do with reverse lookup, the problem here
being that the ISP's address for the IP address is returned. However, I'm
not sure that that matters as there are plenty of mail servers running
multiple domains which don't return the correct domain name in a reverse
lookup.

One thing that might help is that if I do a "dig" against the server, the MX
record appears in "addisitonal records" rather than "answers" - as I've
noticed on onther DNS server. If this is an issue, how do I fix it?

Help ... what am I doing wrong. This is important.

Thanks

Craig

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