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Arping

 

Arping is a util to find out it a specific IP address on the LAN is 'taken' and what MAC address owns it. Sure, you *could* just use 'ping' to find out if it's taken and even if the computer blocks ping (and everything else) you still get an entry in your ARP cache. But what if you aren't on a routable net? Or the host blocks ping (all ICMP even)? Then you're screwed. Or you use arping.

 

Installation:

 

tar -zxvf arping-2.06.tar.gz

make

make install

 

It is available from here.

 

Execution:

 

Usage: arping [-fqbDUAV] [-c count] [-w timeout] [-I device] [-s source] destination

-f : quit on first reply

-q : be quiet

-b : keep broadcasting, don't go unicast

-D : duplicate address detection mode

-U : Unsolicited ARP mode, update your neighbours

-A : ARP answer mode, update your neighbours

-V : print version and exit

-c count : how many packets to send

-w timeout : how long to wait for a reply

-I device : which ethernet device to use (eth0)

-s source : source ip address

destination : ask for what ip address

 

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