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VPN doesn't work in Windows 2000 when two network connections are present

Posted on 2004-08-28
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Last Modified: 2010-04-12
Hi,
I am trying to estabilish a VPN connection to an external VPN server from a computer with two NICs (internet and LAN)... It connects and authenticates normally but the problem is that I cannot ping any IP on the remote location while both connections are present... when I disable the LAN connection, VPN starts working immediately...

any ideas/suggestions?

Darko
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Question by:DarkoLord
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Expert Comment

by:grblades
ID: 11922707
Hi DarkoLord,
An additional network card should not cause any problems except when the IP address range on this network card is the same as being used on the other end of the VPN. If this is the case then traffic will be going to your local network instead of over the VPN. I suggest you change the IP address to one which is on a different network and try again.
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by:DarkoLord
ID: 11922795
Hmmm, maybe the problem is ICS which uses the same IP range for its DHCP? As far as I know there is no way of disabling its DHCP (and also no way of upgrading Win 2000 Pro to Server)...

Here is the ipconfig output:

Ethernet adapter Internet:
        Connection-specific DNS Suffix  . :
        IP Address. . . . . . . . . . . . : 82.xx.xx.xx
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 82.xx.xx.1
Ethernet adapter LAN:
        Connection-specific DNS Suffix  . :
        IP Address. . . . . . . . . . . . : 10.0.0.2
        Subnet Mask . . . . . . . . . . . : 255.0.0.0
        Default Gateway . . . . . . . . . :
PPP adapter VPN:
        IP Address. . . . . . . . . . . . : 192.168.90.67
        Subnet Mask . . . . . . . . . . . : 255.255.255.255
        Default Gateway . . . . . . . . . : 192.168.90.67

Thanks,
Darko
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Accepted Solution

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grblades earned 2000 total points
ID: 11922818
10.0.0.2/255.0.0.0 is a very big range. If the remote network uses this or any subset of it then it wont work. Do you know an example IP address used at the other end of the VPN?
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LVL 22

Author Comment

by:DarkoLord
ID: 11922852
Yeah, that was the problem... I changed the subnet to 255.255.255.0 and it works... thanks!

Darko
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