K.J. Mansley wrote:
On Wed, 2004-03-31 at 18:37, Kelly Chan wrote:
Hello,
We can use ARP to query MAC address for a particular IP? How about the
other way such that is there any protocol or broadcast messages we can
use to query IP address for a particular MAC address?
Yes. Funnily enough it's called Reverse ARP (RARP):
http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?query=rarp&action=Search
Except RARP isn't really supported on most networks. It's really more
of an early alternative to BOOTP (which then, in turn, got superceded by
DHCP.)
For a MAC address for an already configured host on the local network,
one can send a ICMP ECHO (ping) packet with the appropriate unicast MAC
address and the broadcast IP address. You should get a response back,
at which time you know the MAC.
-hpa
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