DNS Problem in Network with router

[Marco Keuthen]

Hi.
Perhaps someone can give me a clue. We have a broadbandrouter (German
T-DSL) in a network with one server (Win 2000) with DHCP enabled.
Gateway / DNS is the router.

Internet access works fine, but after an hour or so, DNS is no longer
functional. The router has a wan connection. We can ping external IPs,
etc, but DNS for external targes doesn't work any more.

We tried the client with and without DHCP, DNS the server and secondary
the router and vice versa.

Any ideas?

Thanks,
Marco

 

[Guest]

T-DSL) in a network with one server (Win 2000) with DHCP enabled.
Gateway / DNS is the router.

No Active Directory or internal DNS Server involved, correct?

Internet access works fine, but after an hour or so, DNS is no longer
functional. The router has a wan connection. We can ping external IPs,

Did you check if the router has been set to "Always-on" or "On-Demand"
access? If there are no WAN activity for n number of minutes, this could have
caused the situation you faced.

Do let us know if this helps. Thanks!

 

[Marco Keuthen]

No Active Directory or internal DNS Server involved, correct?

AD is involved.. and internal DNS.. that was the problem.
Thanks for your answer, nevertheless

Marco

 

[Guest]

If the only Win 2000 Server = Active Directory installed with DNS, the DHCP
(offered by this same server?) should include in its scope the IP address of
this internal DNS server, plus the IP of the gateway / router, etc.

On the DNS Server, configure Forwarders to point to the hardware Gateway /
router (assuming root hints sine exist). This enables any DNS zones not
resolved by your internal DNS Server to be sent out to the Internet.

Do let us know if you need more info (e.g. how to configure forwarders).

Please let us know if this helps. Thanks.