I have the USB modem internet connection. I am using ICS sharing in XP to share my internet connection.

ON window XP LAN i have set up the LAN IP as

192.168.137.1
255.255.255.0

Now i have joined the cable from that XP LAN to another LAPTOP running vista

Now if set the LAN on VISTA to get ip automatically them internet don't work but if manually set the ip to

192.168.137.3
255.255.255.0
gateway 192.168.137.1

Then my internet works

But i want to join that LAN cable from XP to rouer so that i can use router to divide internet.

But i don't know how i can give static ipto router because i think somehow

that LAN on XP is not giving the IP address