Re: IP address already in use

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

Hi,

one (easy?) way is by using command

arp -a

It will display current ARP cache on the computer where you run the command.
If you want to see whole network -- you would have to connect to all hosts
(e.g. by using ping command) and then repeat command

arp -a

to see current MAC addresses in ARP cache.

You can use command

arp -a > MAC.txt

to store the output from arp cache to file for easier searching

You can search the internet for tools that can help you with this. E.g.
search for tools such as "ping subnet"...


Let me know if you need more assistance on this.

--
Mike
Microsoft MVP - Windows Security

"Javan" <uejavan@xxxxxxxxxx> wrote in message
news:%23%23G$tW$YGHA.5116@xxxxxxxxxxxxxxxxxxxxxxx
I might should know this, but I havent had a need until now. How can I
search the network by MAC address?
Jon

"Miha Pihler [MVP]" <mihap-news@xxxxxxxxxxx> wrote in message
news:eNWKWP$YGHA.3848@xxxxxxxxxxxxxxxxxxxxxxx
Hi Javan,

You should be able to see something like this in your event log (at least
on the server)...

The system detected an address conflict for IP address 10.10.10.10 with
the system having network hardware address 00:0D:9D:93:E9:3B. Network
operations on this system may be disrupted as a result.

This "01:1D:9D:93:E9:3A" is a MAC address of the computer / device that
is causing the IP conflict. If you can locate this device by MAC address
you will know who/what is causing you the problems.

I hope this helps.

--
Mike
Microsoft MVP - Windows Security

"Javan" <uejavan@xxxxxxxxxx> wrote in message
news:eYXNrI$YGHA.4936@xxxxxxxxxxxxxxxxxxxxxxx
I have started getting the "IP address already in use" error. I started
getting this after I brought down our old NT server and brought up a new
2k3 server. The server is the system that is getting this error from
time to time. The DHCP is a Sonicwall with the servers mac address set to
a static IP address in the DHCP. The problem doesnt seem to be causing
any issues yet but something isnt right.

I am also started getting this at my house after I hooked up a linksys
wireless router. I secured the wireless with WEP encryption. It isnt
unusual for me to come home after work and have 5+ of these dialog boxes
to go through. I leave that computer on 24x7.

Any possible causes? Both of these cases are completely different but I
have not seen this problem since I moved to DHCP years ago. Seems wierd
that two of these instances pop up in two completely seperate networks.

Thanks

Jon







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