problem with two NICs on same machine

[nadeem attarie]

hi Dear Mr MVP,

I have a following scenario:

I am running a LAN with windows 2000 advanced server as an
authentication server with AD up and perfectly running for
last 4 years. IP of this server is 192.168.1.1

users are provided with the Internet facility, for this
purpose we have proxy server which is a win2000 server
based machine with two network adapters and with ISA as a
proxy server.we have a DSL connection, which is terminated
at our end in a DSL router, provided by the local ISP.

1.follwing is the tcp/ip settings of eth0 on the proxy
server provided by the ISP.this NIC is terminated in the
DSL router.

Ip address: 192.168.1.235
subnet mask 255.255.255.0
default gateway: 192.168.1.212
preferred DNS 202.141.224.34
preferred DNS 202.141.229.34

2.tcp/ip settings of eth1 which serves the internal LAN.

Ip address: 192.168.1.226 (for LAN)
subnet mask: 255.255.255.0
default gateway: 192.168.1.235 (ip address of eth0)
preferred DNS: 192.168.1.1
no alternate DNS

the problem we are having with this setup is:

when both NICs are enabled I am unable to ping my ISP's
DNS or its gateway which is on eth0 and message I recieve
is "request timed out".

when I disable eth1 which is for LAN, I am perfectly able
to ping and browse the internet.

what I have already tried out is:
I've used ip address of eth0 on eth1 as its default
gateway which is mentioned above.

desperately waiting for your reply with solution.

thank you.

nadeem

Karachi, Pakistan

 

[Kris Shaw]

hi Dear Mr MVP,

I have a following scenario:

I am running a LAN with windows 2000 advanced server as an
authentication server with AD up and perfectly running for
last 4 years. IP of this server is 192.168.1.1

Hello,

You need to have IP addresses in different subnets for each interface
on the server, something like:

WAN - 192.168.1.100 / 255.255.255.0

LAN - 192.168.2.100 / 255.255.255.0

Kris.