Duplicate IP problem in LAN

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stergios

Thread Starter
Joined
Sep 6, 2004
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19
Hello.

We are experiencing a problem in our LAN.

Yesterday, suddently, all the PCs on the LAN reported a duplicate IP problem. This was happening everytime a client PC was trying to logon to the network. A dialog box was displayed that notified the user that the PC's IP was used by another PC.

The problem was affecting all PCs thus I thought that it might be a network switch problem.

I switched off the main switch for 2 minutes and then I switched it on, again. This solved the problem but after 4 hours the problem occured again and we had to switch it off and on again.

Today, we did not experience the problem but I would like to ask if someone knows the root cause of such incidents.

Is it the switch, or PC network card?

Also, are there any equipment (hardware / software) tools that I can use in order to determine the root cause of the problem?

Thank you in advance.
 

etaf

Wayne
Moderator
Joined
Oct 2, 2003
Messages
65,442
do you have a DNS server on your network to resolve user names to IP allocation.

We had the same problem in a local office where after 20 people had logged on we started get those errors - it turned out to be two servers with overlapping IP address ranges causing the problem - this went on a few days and 1 person was even told to reload there software by the helpdesk!!!!!
 
Joined
Jul 7, 2004
Messages
7,235
I think etaf means DHCP server.

2 DHCP servers on the same lan can easily cause this type of problem. Check your servers/routers to see what has DHCP enabled.
 

etaf

Wayne
Moderator
Joined
Oct 2, 2003
Messages
65,442
opppsss yep - just answering a question about DNS sorry

exactly what a meant - thanks for the correction
 
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