Marcel Birthelmer wrote:

> What about "arping"? It's like ping, but for ARP! of course this
> necessitates being on the same network, since routers don't generally
> forward ARP stuff.

AFAIK, arp (and arping) needs the IP address to start with. See also
http://en.wikipedia.org/wiki/Address_Resolution_Protocol:

"In computer networking, the Address Resolution Protocol (ARP) is the
method for finding a host's hardware address when only its IP address is
known."

Reverse ARP
http://en.wikipedia.org/wiki/Reverse_Address_Resolution_Protocol: 

"The primary limitations are that each MAC must be manually configured on a
central server, and it is limited to only the IP address, leaving
subnetting, gateways, and other information to be configured by hand."


In(verse)ARP http://www.networksorcery.com/enp/rfc/rfc2390.txt may work,
but I don't know of any tools, so you'd probably have to write your own.

Gerhard

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