2 NIC, no internet connection

HI all
I have a windows 2003 server with 2 NICs. One NIC to ADSL modem and the other to LAN. I can't access Internet from this box when 2 NICs are enabled. I have to diable the LAN connection. Why? How browser decide which NIC to use when browsing internet?

Here are my settings:

IP Routing Enabled. . . . . . . . : Yes

NIC#1 (connect to ADSL modem)
    IP Address. . . . . . . . . . . . : 172.16.0.2
    Subnet Mask . . . . . . . . . . . : 255.255.0.0
    Default Gateway . . . . . . . . . : 172.16.0.1 (the ADSL modem)
    DNS Servers . . . . . . . . . . . : 172.16.0.1 (the ADSL modem)

NIC#2 (Connect to LAN)
   IP Address. . . . . . . . . . . . : 192.168.0.1
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 172.16.0.2 (NIC#1)
   DNS Servers . . . . . . . . . . . : 172.16.0.1 (the ADSL modem)

I do have ISA 2006 installed, but even I dsiable all the services related to ISA, same thing happens

Also, I can get the other LAN machines connect to this box. Do I have to use Routing services? Anyone can point to a good tutorial on setting up a basic ISA environment?

Thanks
bigapple9Asked:
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bigapple9Author Commented:
Sorry the typo of the last paragraph. I mean I CAN'T get other Lan machines....
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PirtatePeteCommented:
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Keith AlabasterEnterprise ArchitectCommented:
Firstly - you cannot have a default gateway on both nics. If you ARE using ISA you cannot have entries for the same subnet on both nics either.
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bigapple9Author Commented:
Thanks Keith! I just removed the default gateway from the LAN NIC (192.168.0.1) and it works! Could you please explain the reason behind it to me? It's still like a mystery to me.

BTW, as I mentioned in my post, I can't get other machines (for example 192.168.0.10) on the LAN connect to this box (192.168.0.1). I can ping to other machine from this box, but no the opposite way - This happened even when ISA is disabled. Also, windows firewall is disabled as well.

What I am trying to do is get all LAN machines connect to internet through this machine. I am new to ISA, please help.

Thanks
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elawadCommented:
concerning the gateway question, while your trying to get into the internet your computer will try to get to your default gateway to reach the internet network since the internet asyou know is on different subnet rather than your private networl so you need a default gateway to get their. and when you were inserting two different gateways on your 2 nics of the isa server makes the computer comfused from which gateway to access internet that is why you were not able to acces the internet.

2nd: you can not ping the ISA server from your internal network, this highly depends on your ISA server configuration, did you create internal network and bind it to your internal network card yes or no, if yes go to your firewall rules and create a rule that allow all outbound trafic fron internal network to your local host for all users and vice versa. after doing this try ping the ISA server from the internal network.  
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bigapple9Author Commented:
Thansk
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