I have a single DNS server for internal use. Two more, OPENDNS servers,
complete the list of three DNS servers given out via DHCP.

Certain web servers are inside our network with one private address, and
outside in the big bad world on a different public address.

I would expect that any internal request for DNS should go to our
internal DNS server, (it is at the top of the list, first in line,) and
return out internal address. This is a good thing since we can not
access the external address from inside our network.

However, it does not appear to be working consistently. For some
people, sometimes, they can not get to the webservers, and pinging the
address returns the outside address.

How can I tell what DNS server is giving the results that a system is
using? Not supposed to be, but actually?

Any ideas why some systems some times would not be getting the proper
replies?

The DNS server is a win2003 server.

Phil

-------- Original-Nachricht --------

> I have a single DNS server for internal use. Two more, OPENDNS servers,
> complete the list of three DNS servers given out via DHCP.
>
> Certain web servers are inside our network with one private address, and
> outside in the big bad world on a different public address.
>
> I would expect that any internal request for DNS should go to our
> internal DNS server, (it is at the top of the list, first in line,) and
> return out internal address. This is a good thing since we can not
> access the external address from inside our network.
>
> However, it does not appear to be working consistently. For some
> people, sometimes, they can not get to the webservers, and pinging the
> address returns the outside address.
>
> How can I tell what DNS server is giving the results that a system is
> using? Not supposed to be, but actually?
>
> Any ideas why some systems some times would not be getting the proper
> replies?
>
> The DNS server is a win2003 server.
>
> Phil

NSLOOKUP - Cmd:

http://www.windowsnetworking.com/art...diagnosis.html

Bernd

Hi
There is Not enough info about your LAN arrangement to give a credible
answer.
DHCP is to provide IPs to computers and it is related directly to DNS.
The Internal DNS address has to on the computer's TCP/IP.
The External DNS (OPENDNS or ISP DNS) has to be on the WAN port of the
Routing mechanism.
Jack (MS, MVP-Networking).

"Phil Smith" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
>I have a single DNS server for internal use. Two more, OPENDNS servers,
>complete the list of three DNS servers given out via DHCP.
>
> Certain web servers are inside our network with one private address, and
> outside in the big bad world on a different public address.
>
> I would expect that any internal request for DNS should go to our internal
> DNS server, (it is at the top of the list, first in line,) and return out
> internal address. This is a good thing since we can not access the
> external address from inside our network.
>
> However, it does not appear to be working consistently. For some people,
> sometimes, they can not get to the webservers, and pinging the address
> returns the outside address.
>
> How can I tell what DNS server is giving the results that a system is
> using? Not supposed to be, but actually?
>
> Any ideas why some systems some times would not be getting the proper
> replies?
>
> The DNS server is a win2003 server.
>
> Phil