My problem is I have 2 networks up at my office and 2 network cards installed in 3 of the machines. I have 1 internal network that does not have inernet access. I also have 1 lan setup for internet access. The internet is going through a wireless router. The problem is when I have both LANs enabled on one machine it defaults to the internal LAN so when I try to surf the net it doesn’t let me. But if I disable the internal network then my internet works.

Is there anyway I can use both? It seems that windows keeps defaulting to my internel(lan). Is there anyway to get around this?

Probably a misconfiguration on your IP assignments. Coul you list the IP numbers, subnet, gateways, etc. for each card and the address of the router to the internet??

It's a case of what each interface metric is set to. If the OS's are XP, the metrics will be set automatically. The interface that has the lowest metric is assumed to be superior and is tried first. I am not sure if the second interface will even be tried should the first one fail.

I presume that the LAN interface (with no internet access) has the lower metric, whether by automatic assignment or manually. Since the LAN has no internet access, it does not have a router/default gateway which will attempt to route the packets.

You have a bunch of different options. You could just turn both networks into one network and simply filter out the PC's that you don't want to access the internet. You could keep the two networks and mess around with the metric settings of the interfaces until you get your desired results, or you could do what I did and write a program to automatically calculate the appropriate interface and make a temporary adjustment to the routing table of the PC.

To access certain devices on our office LAN requires me to connect to our VPN. When I login to the VPN I am assigned an IP Address via the DHCP server on our LAN. This provides me with an IP address on the same subnet as all the machines on the office LAN. The office LAN is connceted to a router, which is connected to an additional logical subnet. The devices that I need to acccess are located on this additional subnet.

The office LAN is 192.168.1.0/24

The additional subnet is 192.168.0.0/24

Since my VPN settings are configured such that I am NOT set to use the default gateway on the remote network, I have to manually adjust my routing table in order to each the 192.168.0.0/24 network.

My program runs the ipconfig /all command and re-directs the output of that command to a flat text file. My program parses the text file and locates the IP address that was assigned to me when I connected to the VPN. It then takes that IP address and adds an entry to the routing table that looks something like:

route 192.168.0.0 255.255.255.0 <ip from VPN> <ip from VPN>.

When I try to access a device on the 192.168.0.0/24 network, my routing table is queried and it instructs my computer to send the packet out the interface which is connected to the VPN. This packet is then seen by the router on my network and is forwarded appropriately.

Ok here are my configurations when I perform an ipconfig /all.

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : D-Link AirPlus G DWL-G122 Wireless U
SB Adapter(rev.A2)
Physical Address. . . . . . . . . : 00-11-95-BD-71-E8
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.101
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 4.2.2.2
4.2.2.3
Lease Obtained. . . . . . . . . . : Monday, August 01, 2005 1:55:25 PM
Lease Expires . . . . . . . . . . : Tuesday, August 02, 2005 1:55:25 PM

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 3Com 3C920 Integrated Fast Ethernet
Controller (3C905C-TX Compatible)
Physical Address. . . . . . . . . : 00-06-5B-CC-47-4C
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.3.118
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.3.1
DHCP Server . . . . . . . . . . . : 192.168.3.1
DNS Servers . . . . . . . . . . . : 151.164.1.8
151.164.11.201
Lease Obtained. . . . . . . . . . : Monday, August 01, 2005 1:54:03 PM
Lease Expires . . . . . . . . . . : Monday, August 08, 2005 1:54:03 PM

Both the LAN and the WAN are behind a router. The lan is behind a cisco router and is for the internal network only. It is using 192.168.3.x subnet. The WAN is hooked up to my business DSL and is using a 192.168.1.x subnet. I really dont know what to.. It is so weird right when I disable the LAN the wan works and I can access the net.. but as soon as I renanble it the wan stops working. But it still has a valid ip and acts as though it is working.

You have a default gateway on each nic. You need to remove the gateway on the internal NIC. Now realize that will still give access to the .3.x network directly attached but not anything past it. Traffic for ALL other networks will default to the SINGLE gateway.
To reach any other internal networks that might exists past .3.x you will need to start adding specific routes for those networks or if these are servers use RRAS and then you have a choice between static routes (like above) or a routing protocol like RIP or OSPF.
Unless these are machines on your DMZ needing this setup it is a rather messy way of doing things.