how to solve a DNS conflict?

[Bill Brehm]

We've been happily running Win2k server on our LAN which I'll call
company.com. Since Win2k requires DNS, we have it set up. Our ISP provided
POP3 email for us for which senders to us used addresses like
(e-mail address removed). But we downloaded our mail by logging into pop3.isp.com.
Now the ISP has upgraded their email server and we have a conflict because
we now have to download our mail by accessing pop3.company.com. I solved
(bandaided) the problem by adding an A record called pop3 in our DNS and
pointing it to the IP address of our email server on the ISP. But now the
ISP has upgraded again to a round-robin server and we can't expect the IP
address to remain constant.

I need to figure out how to tell the DNS that for pop3.company.com, it
should look outside for resolution and not even cache the IP address it
finds. For anything else inside, *.company.com, it should continue to look
inside as it now does and for anything outside, *.*.com, it should look
outside, as it now does.

Using the A record was a kludge fix but I don't know the proper method.

Thanks,

Bill

 

[Kevin D. Goodknecht Sr. [MVP]]

We've been happily running Win2k server on our LAN which I'll call

company.com. Since Win2k requires DNS, we have it set up. Our ISP
provided POP3 email for us for which senders to us used addresses like
(e-mail address removed). But we downloaded our mail by logging into
pop3.isp.com. Now the ISP has upgraded their email server and we have
a conflict because we now have to download our mail by accessing
pop3.company.com. I solved (bandaided) the problem by adding an A
record called pop3 in our DNS and pointing it to the IP address of
our email server on the ISP. But now the ISP has upgraded again to a
round-robin server and we can't expect the IP address to remain
constant.

I need to figure out how to tell the DNS that for pop3.company.com, it
should look outside for resolution and not even cache the IP address
it finds. For anything else inside, *.company.com, it should continue
to look inside as it now does and for anything outside, *.*.com, it
should look outside, as it now does.

Using the A record was a kludge fix but I don't know the proper
method.

Open your company.com forward lookup zone, create a new Delegation, name it
pop3, give it your public DNS hosting providers DNS IP and names. This
delegation must be to the external authoritative DNS servers.