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RE : [lwip-users] MAC Question????
From: |
Frédéric BERNON |
Subject: |
RE : [lwip-users] MAC Question???? |
Date: |
Thu, 20 Mar 2008 08:56:34 +0100 |
To be sure, do you answer to a thread post in... 2004 ? Else, it seems I miss
some emails??? ;)
====================================
Frédéric BERNON
HYMATOM SA
Chef de projet informatique
Microsoft Certified Professional
Tél. : +33 (0)4-67-87-61-10
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====================================
P Avant d'imprimer, penser à l'environnement
-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de H. Peter Anvin
Envoyé : mercredi 19 mars 2008 23:10
À : Mailing list for lwIP users
Objet : Re: [lwip-users] MAC Question????
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of an early alternative to BOOTP (which then, in turn, got superceded by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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