2 ip addresses one network card routing windows xp

What you do is the same as was mention by setting the registry entry: HKEY_LOCAL_MACHINE \SYSTEM\CurrentControlSet\Services\Tcpip \Parameters

subkey : "IPEnableRouter" entry ,default set to "0", change to "1".

Make sure it is set to 1 and reboot.

1) Right-click the "My Network Places" icon.
2) In the window you should see "Local Area Connetion"
3) Right-click that name.
4) Should now see Local Area Connection Properties
5) Find Internet Protocol (TCP/IP)
6) Double Click that (or just press Properties button)
7) You should see your Config and an Advanced... button
Press the Advanced button
9) In the IP Addresses, you should see the IP address for your NIC
10) Press the Add button
11) Add the new IP.
12) Press OK to all the windows
13) Open a cmd prompt
14) Enter "IPCONFIG"

You should see something like

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.122.30
Subnet Mask . . . . . . . . . . . : 255.255.255.0
IP Address. . . . . . . . . . . . : 192.168.122.7
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.122.11

As you can see there are now 2 IP addresses.

My old IPConfig, before I added the address looked like this:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.122.7
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.122.11

That should work fine as long as your other stations are correct.

thanks