Two PCs ping with same IP

Posted on 2011-10-28
Last Modified: 2012-05-12

I had just built a new machine, machine01, which came up with the same IP as an existing machine on the network, machine02.  
I did the follow on machine01:
ipconfig /release
ipconfig /flushdns
ipconfig /renew
ipconfig /registerdns
Finally gave machine01 static ip address
Running ipconfig on machine01 shows the static address given to it

Did ipconfig /registerdns again
removed and re-added machine01 from the domain

Both machine01 and machine02 still ping with the same IP address even thought machine01 has a static IP.  I believe this is a DNS issue, but I don't know what to do about it.

Greatly appreciate any help on this.

Question by:maureen99
    LVL 20

    Expert Comment

    From which machine are you pinging them? You need to flush the DNS on the machine from which you make the ping, so if it is machine03, you should execute ipconfig /flushdns on it
    LVL 9

    Expert Comment

    Check DNS and make sure that they aren't configurd in there to point to the same IP.

    Author Comment

    Thanks for the quick responses.

    TheAvenger: I did flushdns on the machine I was pinging from and still get the same results.

    bill_lynch:  Can you tell me what exactly in DNS needs to be checked?


    LVL 20

    Expert Comment

    Can you run this command on both machine01 and machine02 and show us the result:

    ipconfig /all
    LVL 9

    Accepted Solution

    Look at the Name to IP Mapping and make sure that DNS isn't pointing both names to the same IP Address.

    Ping both IP Addresses (the ones that you expect them to have to see if that works)
    LVL 7

    Assisted Solution

    As bill lynch advised check in the DNS server forward lookup zone that the name of the two machines are not mapping to the same ip address and if they are delete the record for the machine that you changed its ip address then after taht do the ipconfig /registerdns on that machine you just deleted and restart both machines then try to ping again.
    LVL 15

    Expert Comment

    What are the MAC addresses of these machines?

    Author Comment

    Thanks for all the help!

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