Windows 2000 Server Internet issues with different high-speed connections

[Dan]

Hello,

I have a client that is using a Windows 2000 Server setup as a domain
controller. It is setup with Active Directory and is configured as a
DHCP server and of course DNS is running but with an unqualified
domain name (i.e. server.local). We've been using a Sprint Broadband
connection that uses a cable modem for some time now without any
problems. From the Sprint cable modem I run the connection into a
Netgear Cable/DSL router which is performing NAT but not DHCP. I do
this to protect the network from the outside world. The Server
provides DHCP IP addresses and it's own IP as the DNS server for the
network. I have enabled DNS forwarders in the Server's DNS and have
deleted the root "." zone from the foward lookup zone per a set of
instructions I located on this type of configuration.

We recently switched over to a fractional T1 and that is when the
trouble began. As soon as I run a cable from the T1 router to the
cable/dsl router and configure the cable/dsl router for a static IP,
things get flaky...meaning that I can ping a site but I might only
receive two out of four packets in reply. Attempting to bring up any
website may or may not complete successfully and sometimes there's
just a lengthy delay.

I connected a PC directly to the T1 router and set it up with static
IP, DNS, GW, and SM that I have been using in the cable/dsl router and
everything worked fine. I've tried flushing the DNS cache on the
server but to no avail. I'm not sure what to try next. I believe the
issue lies somewhere in my DNS configuration on the server but I'm not
very knowledgable with regard to DNS configuration and setup.

Any help is greatly appreciated.

Dan

 

[Marina Roos]

Are you using a second nic in the server? If that's the case, is the gateway
on the internal nic blanc? Is the internal nic on top in the bindingorder
(Network Connections, advanced, advanced)? Got the server-IP in the
DNS-field of the external nic?

Marina