DNS issue

[DJ]

Hi all,

I got a problem with my DNS server. I got single DC with
DNS running on it. I got one NIC for the internal network
and USB DSL modem i use for internet access. IT makes
software emulation of another NIC. The IP address i get
from the ISP is dynamic. SO here's the prob. If i restrict
the IP address of the software NIC form the list of the
DNS's interfaces, the DNS server doesnt resolve neither
internal nor external addresses. It doesnt pass neither
simple query test nor the recursive one. The strange thing
is that if i use nslookup on the DC - it resolves internal
and external DNS. If i choose "All IP addresses" - it
starts working perfectly. I cut out inbound 53 TCP and UDP
on DSL interface, but does any1 has an idea what could be
the problem?
Thanks.

 

[Ace Fekay [MVP]]

In

Hi all,

I got a problem with my DNS server. I got single DC with
DNS running on it. I got one NIC for the internal network
and USB DSL modem i use for internet access. IT makes
software emulation of another NIC. The IP address i get
from the ISP is dynamic. SO here's the prob. If i restrict
the IP address of the software NIC form the list of the
DNS's interfaces, the DNS server doesnt resolve neither
internal nor external addresses. It doesnt pass neither
simple query test nor the recursive one. The strange thing
is that if i use nslookup on the DC - it resolves internal
and external DNS. If i choose "All IP addresses" - it
starts working perfectly. I cut out inbound 53 TCP and UDP
on DSL interface, but does any1 has an idea what could be
the problem?
Thanks.

What DNS addresses are being used on both NICs? That could be a factor. In
an AD environment, you can't use your ISP's in the NIC properties, or all
kinds of things go wrong.

--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory

 

[DJ]

-----Original Message-----
In DJ <[email protected]> posted his concerns then I replied down below:

What DNS addresses are being used on both NICs? That could be a factor. In
an AD environment, you can't use your ISP's in the NIC properties, or all
kinds of things go wrong.

--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory
--
=================================


.

Ok - i got for the internal network 192.168... and the
other one is dynamic external from my ISP. And when i
choose for my DNS to listen only on the internal NIC
(192.168..) it wont work (. Dns wont pass neither simple
nor recursive query tests. And as i mentioned - the
strange thing is that if i use NSLOOKUP on the DNS server -
it resolves both - internal and external. (

 

[Ace Fekay [MVP]]

In

Ok - i got for the internal network 192.168... and the
other one is dynamic external from my ISP. And when i
choose for my DNS to listen only on the internal NIC
(192.168..) it wont work (. Dns wont pass neither simple
nor recursive query tests. And as i mentioned - the
strange thing is that if i use NSLOOKUP on the DNS server -
it resolves both - internal and external. (

Dual NICs always cause this problem. It's a matter of configuration.

Move the internal NIC to the top of the binding order in Network & Dialup
Connections, Adv menu, Adv settings.
Force DNS to be your server on the outside NIC, but leave the IP part to get
it from your provider.
Delete the root zone (looks like a period) if it exists.
Setup a forwarder to your ISP's DNS in your DNS server properties.
On the outside NIC, disable NetBIOS, uncheck File & Print Svcs and the MS
Client service.
Set it to listen to the internal NIC.

Then it should work.


--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory