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03.10.2008 at 12:37PM PDT, ID: 23229658
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8.6

IP address conflict - need to find computer name from MAC address

Zone: Windows Programming
Tags: IP Address Conflict
I just logged into my domain controller and got an error message stating that there appears to be an IP address conflict. I have not added any new hardware to the network in the past several weeks so I find this error message very strange. I have the MAC address of the conflicting system from the event logs. Is there a way to do some sort of reverse lookup to find the computer name of the offending computer from it's MAC address?
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Question Stats
Zone: Programming
Question Asked By: alan2938
Solution Provided By: rickiswpg
Participating Experts: 4
Solution Grade: A
Views: 340
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03.10.2008 at 12:47PM PDT, ID: 21089722
rickiswpg:

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03.10.2008 at 12:47PM PDT, ID: 21089728
droyden:

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03.10.2008 at 01:47PM PDT, ID: 21090259

Rank: Genius

jkr:

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03.10.2008 at 03:03PM PDT, ID: 21090899
mattleb:

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03.10.2008 at 03:21PM PDT, ID: 21091022
droyden:

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03.10.2008 at 03:29PM PDT, ID: 21091071
alan2938:

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03.10.2008 at 09:04PM PDT, ID: 21092964
mattleb:

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03.11.2008 at 06:31AM PDT, ID: 21095489
alan2938:

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03.11.2008 at 06:46AM PDT, ID: 21095629
rickiswpg:

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03.11.2008 at 06:51AM PDT, ID: 21095687
alan2938:

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03.11.2008 at 07:00AM PDT, ID: 21095765
rickiswpg:

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03.11.2008 at 07:47AM PDT, ID: 21096197
alan2938:

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03.10.2008 at 12:47PM PDT, ID: 21089722
rickiswpg:
Is it a conflict with your DC and another system or 2 systems?

You could run nmap on your network. It Displays IP addresses, device name, and and mac address.

http://nmap.org/download.html


Accepted Solution
 
03.10.2008 at 12:47PM PDT, ID: 21089728
droyden:
You could try this program:

http://www.youngzsoft.net/cc-get-mac-address/

Alternately If you can change the IP of the DC temporarily then you could try to use WINS to resolve the IP (the conflict) into the PC name using:

ping -a ip

from a dos prompt.
Assisted Solution
 
03.10.2008 at 01:47PM PDT, ID: 21090259

Rank: Genius

jkr:
Open a Command Prompt and type

arp -a

and locate the MAC adress on the list that is shown.
 
03.10.2008 at 03:03PM PDT, ID: 21090899
mattleb:
If you have access to the local network switches you can issue a "show ip arp" command if Cisco or "show arp" if Foundry.
There may be a lot of devices so you can filter the output for your specific IP "show arp | inc 10.10.10.x"
Hope this helps.
 
03.10.2008 at 03:21PM PDT, ID: 21091022
droyden:
he has the mac address already guys

another idea I just thought of is if you are part of a domain you could try to see what services the IP is running, if its on the domain try to connect to c$ share. See if its running a webserver etc etc, you may be able to figure out what the machine is called from that.
you can use nmap (www.nmap.org) to finger print it and see what OS it is running - nmap will also map the MAC address to the manufactuer which may also help figuring out what the device is.

Thanks
 
03.10.2008 at 03:29PM PDT, ID: 21091071
alan2938:
Ya, I downloaded nmap and started an intensive scan on my entire subnet about 2 hours ago.... I learned the hard way that I should have just done the specific IP in question. Oh well. Maybe I'll find out some other useful information once the scan is complete.

But yes you are correct, I already have the MAC address. I need to try and trace it to a computer.
 
03.10.2008 at 09:04PM PDT, ID: 21092964
mattleb:
If you have the Mac then you can track down which port on the switch it is connected to.
 
03.11.2008 at 06:31AM PDT, ID: 21095489
alan2938:
When I use nmap it just shows results for my domain controller, not the machine that is conflicting with it. Also, none of my switches are managed except my gateway (Cisco 1800 series) so I can't track down a MAC address from the switch.
 
03.11.2008 at 06:46AM PDT, ID: 21095629
rickiswpg:
Hmmm, well aside from temporarily changing the ip of your DC I'm not sure how you are going to be able to find it. You could change the ip of your dc, nmap the ip in question. That should give you a computer name.

I'd do this after hours of course.

Anyone else got any ideas?
 
03.11.2008 at 06:51AM PDT, ID: 21095687
alan2938:
I went ahead and changed the IP of my dc. The scan result from the nmap didn't really give me anything useful. It showed that only telnet and http ports were open. Here are the fingerprints from the scan: 
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Not shown: 1712 closed ports
PORT   STATE SERVICE VERSION
23/tcp open  telnet?
80/tcp open  http?
|_ HTML title: Site doesn't have a title.
2 services unrecognized despite returning data. If you know the service/version, please submit the following fingerprints at http://www.insecure.org/cgi-bin/servicefp-submit.cgi :
==============NEXT SERVICE FINGERPRINT (SUBMIT INDIVIDUALLY)==============
SF-Port23-TCP:V=4.53%I=7%D=3/11%Time=47D68B1E%P=i686-pc-windows-windows%r(
SF:NULL,C,"\xff\xfb\x03\xff\xfd\x01\xff\xfd\x1f\xff\xfb\x05")%r(GenericLin
SF:es,C,"\xff\xfb\x03\xff\xfd\x01\xff\xfd\x1f\xff\xfb\x05")%r(GetRequest,C
SF:,"\xff\xfb\x03\xff\xfd\x01\xff\xfd\x1f\xff\xfb\x05")%r(HTTPOptions,C,"\
SF:xff\xfb\x03\xff\xfd\x01\xff\xfd\x1f\xff\xfb\x05")%r(RTSPRequest,C,"\xff
SF:\xfb\x03\xff\xfd\x01\xff\xfd\x1f\xff\xfb\x05");
==============NEXT SERVICE FINGERPRINT (SUBMIT INDIVIDUALLY)==============
SF-Port80-TCP:V=4.53%I=7%D=3/11%Time=47D68B1E%P=i686-pc-windows-windows%r(
SF:GetRequest,101,"HTTP/1\.1\x20403\x20Forbidden\r\nServer:\x20GoAhead-Web
SF:s\r\nPragma:\x20no-cache\r\nCache-Control:\x20no-cache\r\nContent-Type:
SF:\x20text/html\r\n\r\n<html><head><title>Forbidden</title></head>\r\n\x2
SF:0\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20<body><h2>
SF:Access\x20Denied:\x20Access\x20to\x20the\x20Server\x20is\x20Disabled</h
SF:2>\r\n</body></html>\r\n")%r(HTTPOptions,13C,"HTTP/1\.1\x20400\x20Page\
SF:x20not\x20found\r\nServer:\x20GoAhead-Webs\r\nPragma:\x20no-cache\r\nCa
SF:che-Control:\x20no-cache\r\nContent-Type:\x20text/html\r\n\r\n<html><he
SF:ad><title>Document\x20Error:\x20Page\x20not\x20found</title></head>\r\n
SF:\t\t<body><h2>Access\x20Error:\x20Page\x20not\x20found</h2>\r\n\t\twhen
SF:\x20trying\x20to\x20obtain\x20<b>\(null\)</b><br><p>Bad\x20request\x20t
SF:ype</p></body></html>\r\n\r\n")%r(RTSPRequest,13C,"HTTP/1\.1\x20400\x20
SF:Page\x20not\x20found\r\nServer:\x20GoAhead-Webs\r\nPragma:\x20no-cache\
SF:r\nCache-Control:\x20no-cache\r\nContent-Type:\x20text/html\r\n\r\n<htm
SF:l><head><title>Document\x20Error:\x20Page\x20not\x20found</title></head
SF:>\r\n\t\t<body><h2>Access\x20Error:\x20Page\x20not\x20found</h2>\r\n\t\
SF:twhen\x20trying\x20to\x20obtain\x20<b>\(null\)</b><br><p>Bad\x20request
SF:\x20type</p></body></html>\r\n\r\n")%r(FourOhFourRequest,101,"HTTP/1\.1
SF:\x20403\x20Forbidden\r\nServer:\x20GoAhead-Webs\r\nPragma:\x20no-cache\
SF:r\nCache-Control:\x20no-cache\r\nContent-Type:\x20text/html\r\n\r\n<htm
SF:l><head><title>Forbidden</title></head>\r\n\x20\x20\x20\x20\x20\x20\x20
SF:\x20\x20\x20\x20\x20\x20\x20\x20\x20<body><h2>Access\x20Denied:\x20Acce
SF:ss\x20to\x20the\x20Server\x20is\x20Disabled</h2>\r\n</body></html>\r\n"
SF:);
MAC Address: 00:30:AB:23:95:85 (Delta Networks)
No OS matches for host
Open in New Window
 
03.11.2008 at 07:00AM PDT, ID: 21095765
rickiswpg:
It's showing Delta Networks next to the MAC Address... I wonder if it's a switch or something else.

Do you have anything made by delta networks? http://www.dninetworks.com
Assisted Solution
 
03.11.2008 at 07:47AM PDT, ID: 21096197
alan2938:
Hm... tracked it down to my Dell PowerConnect 3024. I have no reason why this has happened now since I haven't changed any configuration in over a month. Thanks for your help!
 
 
rickiswpg
03.11.2008 at 09:01AM PDT, ID: 21097049
Glad you found it. Kind of weird that it would just start doing that though.
 
 
 
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