Wrong IP Address

Question

I have a WRT610N v2 router (IP address is 192.168.1.1), three desktops, one laptop and one Windows Home Server. Two desktops are running Win XP and one is Win 7, the laptop is running Win 7. I am using Cisco Network Magic Pro on all of my computers and server. On my main desktop (Win XP) Network Magic Pro shows the routers IP address as 192.168.1.1, after resetting the router, my laptop had the same IP address (192.168.1.1) but after the laptop is turned off for awhile and then turned back on it has the wrong IP address (192.168.100.1). My other desktops have the wrong IP address also (192.168.100.1). I have tried to change the IP Address on the router but that just made it worse, I had to rest the router again. Please note: when I first purchased my router it was a different router, it was a WRT610N v1 and it stopped working, so now I have v2. How do I change the IP Address or Addresses to the correct one and make it stay? Please help me, my wife is driving nuts!!!!!

Answer 1

Are you saying that you are seeing two subnets (192.168.1.x   and  192.168.100. x  ) , and these subnets are being used by devices that are connected to the WRT610N  (wirelessly, or by wire to the LAN ports)  ?
If so, then this means that you have an extra DHCP server turned on on your network.  My suspicion is that perhaps the DHCP server in "Windows Home Server" is turned on.
Normally, all your computer addresses would be in the range of 192.168.1.100  thru  192.168.1.149  (the WRT610N's default DHCP server range).  
Normally, your Windows Home Server would be set to a fixed LAN IP address that is outside the DHCP server range, and does not end in 0, 1, or 255.
Rules for using fixed LAN IP addresses on Linksys routers:
With Linksys routers, a fixed (static) LAN IP addresses must be assigned in the device that is using the address. So you need to enter the fixed address in the computer or printer, not in the router.
When using a Linksys router, any fixed LAN IP address must be outside the DHCP server range (typically 192.168.1.100 thru 192.168.1.149), and it cannot end in 0, 1, or 255.
Therefore any fixed LAN IP address would normally need to be in the range of
192.168.1.2 thru 192.168.1.99 or
192.168.1.150 thru 192.168.1.254
assuming you are still using the default DHCP server range.
Also, in the computer, when you set up a static LAN IP address, you would need to set the "Subnet mask" to 255.255.255.0 and the "Default Gateway" to 192.168.1.1 and "DNS server" to 192.168.1.1
It is also important that no two devices on your network be set to the same static LAN IP address.
Check all of your static LAN IP addresses. If you have violated any of the above rules for static LAN IP addresses, it could be the cause for your problem, and you should fix it before attempting any other router repairs or changes.