DNS Problems

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I hope someone can help wit this. I have a client who is
running SBS2000 sp4 with 2 nic's in the server one on the
LAN and one as a gateway to a ADSL router.

I have configured the LAN NIC to use the SBS DNS server
(On 10.0.0.1) and I have configured the DNS Server to
forward requests to external DNS servers.

The problem Im having is as follows if you attempt to
resolve a url sometimes it works and sometimes it does
not.

When its working it will resolve perfectly but then it
just stops working and you get the host unknown messege
weather you do it from the server or a client. It wont
work for arround 10 mins then it starts working again for
a short while. This repeats consistantly.

Some of the things I have tried are:

Using different forwarders in DNS Server.

Assigning Multiple DNS servers to the Server NIC manually
and the clients using DHCP. Keeping the internal DNS
server 10.0.0.1 as the primary and having multiple
external DNS servers as the secondary ones.

Disabling WINS

Flushing the DNS cash using ipconfig /flushdns

The current config is all DNS requests go to the SBS DNS
Server 10.0.0.1 and it is set to forward. This includes
DNS requests for internet access and Exchange Server.

Using NSLOOKUP the correct server is responding weather it
resolves or not.


This problem is driving my client nuts and its getting
embarrasing. There are no errors occuring in the event log.

Please can any one help.
Top

Re: DNS Problems by Marina

Marina
Tue Dec 23 15:20:35 CST 2003

Can you post the ipconfig/all from the server please? Have you checked the
bindingorder of your nics (Network Connections, Advanced, advanced) and made
sure the internal nic is on top?
Make sure the external nic has only TCP/IP bound to it.
Make sure the external IP-range is not in the LAT of ISA.
Of course you have run the ICW-wizard, right?

--
Regards,

Marina

"James Hughes" <james@matrixdigital.co.uk> schreef in bericht
news:018901c3c98e$13fccee0$a401280a@phx.gbl...
> I hope someone can help wit this. I have a client who is
> running SBS2000 sp4 with 2 nic's in the server one on the
> LAN and one as a gateway to a ADSL router.
>
> I have configured the LAN NIC to use the SBS DNS server
> (On 10.0.0.1) and I have configured the DNS Server to
> forward requests to external DNS servers.
>
> The problem Im having is as follows if you attempt to
> resolve a url sometimes it works and sometimes it does
> not.
>
> When its working it will resolve perfectly but then it
> just stops working and you get the host unknown messege
> weather you do it from the server or a client. It wont
> work for arround 10 mins then it starts working again for
> a short while. This repeats consistantly.
>
> Some of the things I have tried are:
>
> Using different forwarders in DNS Server.
>
> Assigning Multiple DNS servers to the Server NIC manually
> and the clients using DHCP. Keeping the internal DNS
> server 10.0.0.1 as the primary and having multiple
> external DNS servers as the secondary ones.
>
> Disabling WINS
>
> Flushing the DNS cash using ipconfig /flushdns
>
> The current config is all DNS requests go to the SBS DNS
> Server 10.0.0.1 and it is set to forward. This includes
> DNS requests for internet access and Exchange Server.
>
> Using NSLOOKUP the correct server is responding weather it
> resolves or not.
>
>
> This problem is driving my client nuts and its getting
> embarrasing. There are no errors occuring in the event log.
>
> Please can any one help.


Top

Re: DNS Problems by Jim

Jim
Tue Dec 23 17:03:22 CST 2003

I have suffered this at two accounts. I just turned off forwarders and
the problems stopped. Your server dns has root hints which work fine.

As Marina mentions, post ipconfig/all form the server and at least one
workstation to make sure you do not have something missconfigured.

"James Hughes" <james@matrixdigital.co.uk> wrote:

>I hope someone can help wit this. I have a client who is
>running SBS2000 sp4 with 2 nic's in the server one on the
>LAN and one as a gateway to a ADSL router.
>
>I have configured the LAN NIC to use the SBS DNS server
>(On 10.0.0.1) and I have configured the DNS Server to
>forward requests to external DNS servers.
>
>The problem Im having is as follows if you attempt to
>resolve a url sometimes it works and sometimes it does
>not.
>
>When its working it will resolve perfectly but then it
>just stops working and you get the host unknown messege
>weather you do it from the server or a client. It wont
>work for arround 10 mins then it starts working again for
>a short while. This repeats consistantly.
>
>Some of the things I have tried are:
>
>Using different forwarders in DNS Server.
>
>Assigning Multiple DNS servers to the Server NIC manually
>and the clients using DHCP. Keeping the internal DNS
>server 10.0.0.1 as the primary and having multiple
>external DNS servers as the secondary ones.
>
>Disabling WINS
>
>Flushing the DNS cash using ipconfig /flushdns
>
>The current config is all DNS requests go to the SBS DNS
>Server 10.0.0.1 and it is set to forward. This includes
>DNS requests for internet access and Exchange Server.
>
>Using NSLOOKUP the correct server is responding weather it
>resolves or not.
>
>
>This problem is driving my client nuts and its getting
>embarrasing. There are no errors occuring in the event log.
>
>Please can any one help.

Jim B. SBS MVP
remove the mvp to send email
Top