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Network IP Addressing
Summary: Two computers should never have the same IP address if they're on the same network. If they do, results are unpredictable.
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What happens if two computers have the same IP address? |
An IP address uniquely identifies every computer on the internet.
The key word there is unique.
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If two computers on the same network have the same IP address ... well, the results are unpredictable. It depends on how all the other equipment on the network handles the problem. In general it could be as bad as both machines not being able to communicate at all. More likely only one will not be able to, or perhaps there will simply be intermittent problems on both.
In short: don't do it.
Related:
Ask Leo! - How do I figure out who owns an IP address?
Ask Leo! - Why does my home network only work with one computer at a time?
Ask Leo! - What is DHCP?
Ask Leo! - Why is my IP blocked at a website I visit regularly after I changed ISPs?
Article C2262 - January 18, 2005
I am trying to run a server for a game on my computer but the problem is that everyone in my neighborhood has the same IP because of how the network is set up, is there any way to get around this without having to use programs like Log Me In - Hamachi
Posted by: Max at October 27, 2008 4:36 PMcan i give same ip address with different subnetmask to 2 computers i same network?
Posted by: samrat at November 5, 2008 1:45 AMLEO, my computer keeps saying that it has the same ip address as something else, i have an xbox up stairs and i use the ip address of the computer downstairs, i also have a labtop up stairs and i get internet from my neighbor. so do you think that my xbox is ruining it or my labtop, or something else? i need help
Posted by: Christian Taylor at November 25, 2008 4:52 PMam i to understand that if i two seperate emails come from two seperate people in two seperate towns yet both emails have the same ip addresses, that i am actually being fooled by one single person? i had my suspicions due to the wording being far to similar, so i checked the ip addresses and turns out they are the same. what if the mails are being sent via a mobile phone isp?
Posted by: gabi at December 13, 2008 1:51 PMHi Leo
My Home network and my work network computers, have the same IP addresses.I want to remote to my work network with my laptop that is networked at home.
Do I have to manually change the IP addresses at home? If I do, do I also change the router stetting?
thank you
Posted by: Claude Piccini at January 6, 2009 1:44 AMClaude
Call me crazy, but i got this warning message after being away from home all day and I only left one computer turned on that was connected to my router. Have you ever heard of this warning coming up falsely in XP Pro? My only other explanation is that someone plugged in a computer to my router while I was gone :'(
Posted by: JBourne at January 7, 2009 6:45 PMI got a laptop and sharing wirless with someone else in the house, it was working fine until yestersday when it was telling me that i have the same ip address as another computer and now my internet wont work .. why is this
Posted by: louise at January 27, 2009 2:57 PMif two systems have same IP address than congestion can occur on the network,slows down the data rate nd speed.
Posted by: aman at March 10, 2009 9:21 AMHow to find that two pc's using the same ip address.
Posted by: ATTAR at April 2, 2009 10:14 PMhi leo can u help me i am using modem dailup someone use same my computer ip and blackmaling peoples how that happen and how i trace him ? can u help me
Posted by: nikamma at May 17, 2009 3:14 AM