Re: Preventing IP conflict

On Fri, Dec 21, 2007 at 05:16:40PM +1000, Julian De Marchi wrote:
> <snip>
>
>> The network administrator should have tools to detect the problem but you
>> can try this method (i never use it when i have an ip conflict)
>>
>> First : launch "ifconfig" and see your ip address/netmask. I assume that
>> is 192.168.1.2 with a netmask 255.255.255.0
>>
>> Second : launch "nmap 192.168.1.0-255" (adapt according your ip and
>> netmask). I take some minutes (less than 5 in most of cases). This method
>> works if the machine on the network don't block each reply from nmap, but
>> i think it's so if your network adminstrator did his job ;)
>> Now you will see each ip used on your network.
>>
>> Third : Switch to a static address that has not been listed by nmap and
>> see if you have problem. If you have one, try another till you find
>> temporary a ip address which is not used
>>
>> Fourth : in root, do "arp 192.168.1.2"(your first ip address which gives
>> the conflict). Normally, it will show you its mac address. With this one,
>> you can see your network administrator.
>>
>> I repeat that i never used this method with an ip conflict. I may not work
>> but if it works, i'm glad to know it.
>
> Great suggestion Chris! I never though of using nmap for this type of
> troubleshooting.

some company would consider this hacking if not done by the it department and the user could get ping'ed!

>
> Well done Chris!
>
> --
> Cheers,
> Julian De Marchi
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> OpenNIC user - http://www.opennicproject.org/
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