Two Computers Using the Same IP Address

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TechPerson32

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Apr 4, 2013
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Hello, recently my dad brought an old computer from his office for me and I decided to use it as a host for personal servers for a game called Minecraft. I do know how to port-forward with my router, but now I came across one problem: the IP addresses match (the servers won't work because of that). I think the cause is this: I originally used a USB wireless network adapter on my main computer, but then moved it to the computer I just got. I think the IP address was transferred. Is there a way I can get a new IP address?
 
Solution
Ijack
http://www.howtogeek.com/howto/19249/

Make sure that you use an address on the same network as your other computers (the first three numbers the same) but one that is not in the range of addresses assigned by your router (the web interface will tell you that information).
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TechPerson32

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Apr 4, 2013
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1. The computer's IP
2. I said my main computer and the computer I just got
3. I didn't assign them manually, so DHCP.

 
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bill001g

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Aug 9, 2012
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I suspect the computer you got has the ip hard coded. It unlikely DHCP would give both machine the same ip...that is the whole purpose of DHCP. Then again to properly port forward without have to change it all the time the IP must be set manually so just change it to something that is not a duplicate of your other computer.
 
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Ijack

Ijack

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Jul 30, 2008
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Quite a coincidence that a manual address just happens to coincide with a DHCP one, but it's certainly possible. If the addresses really are assigned by DHCP then just releasing and renewing the leases should fix things.

If you do assign a fixed address (and, as said, you really need to) then make sure it is not one covered by the DHCP zone on your router. Personally I give all fixed devices on my network manual addresses and leave DHCP to handle visitors and a few odd devices.

Re-reading your OP, yes the IP address would have transferred when you moved the network card (DHCP looks at the MAC address). But your main computer should have picked up a new address for its new network card.
 
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TechPerson32

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Apr 4, 2013
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How do I change it? I'm using Windows XP Professional 32-bit on the computer I recently got (not my main).
 
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Ijack

Ijack

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http://www.howtogeek.com/howto/19249/

Make sure that you use an address on the same network as your other computers (the first three numbers the same) but one that is not in the range of addresses assigned by your router (the web interface will tell you that information).
 
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