IP address conflict with a system in the network. help!?

Question

My laptop used to have a bubble showing up saying I have an IP address conflict with a system in the network and I went to start then run all the way to ipconfig/renew and after I press enter, the bubble has stopped popping up,but it still won't let me connect to the internet. What can I now do to get my internet running again?

Answer 1

a few questions:



1) How many PC's on your network? - this includes both wired and wireless depending on the router you have in place

2) What type of router do you have? - depending on the router's DHCP range specified to be given out to LAN hosts, this has a lot to do with narrowing in on the problem.

3) Are your PC(s) obtaining IP information automatically? - if everything is being obtained automatically from the router then there should'nt be any type of conflict. If you have static IP(s) on your network within your routers DHCP range this could easily cause a conflict.





Typically you can use the command 'arp -a' to list any/all hardware MAC addresses on your LAN broadcasting netbios (filesharing requests). have you tried this?



To be blunt.. the whole situation is dependent on your network config. be sure if using any static IP addys that they're not within the routers DHCP range.



One last thing to consider is the ARP timeout. specified on your router for any DHCP clients. A lot of the time if one PC holds an IP address and then gets turned off/disconnected - the router will have issues interpreting if it is still in use or not.



One useful tool (it's free) is wireshark, although the output takes some getting used to.



In layman's terms: let your PCs (if multiple) obtain their own IP address information otherwise follow above recommendations to eliminate the problem.



good luck!



signed-

-Senior systems/network architect

Answer 2

Go to each computer and find out the IP address.



Run / Winipcfg

Or

Run / CMD / ipconfig



Depending on your OS.

Your looking for the IP addresses, they should all be different, but you will find that yours and one other have the same.

(Ex 192.168.0.100 or 192.168.1.101, or 192.168.0.XXX, XXX = 2-254)



Enter network properties / TCP/IP and adjust the last octet to any thing different (2-254), but make sure it does not match any other system.



The best bet, is to enable DHCP with in your Cable Router, and then go to each PC, and adjust for DHCP.

Answer 3

It is caused by the duplicate IP adress, you can configure your computer to attain the IP address automatically, or you can use the following tools to find out who are using the same IP with you and let them know and change it.

http://www.colasoft.com/mac_scanner/index.php/?prid=05080001