Questions about ARP

Dave Ellis DGE at
Wed Aug 13 00:05:40 EST 2003

Steven Scholz wrote:

> Windows is checking for duplicate addresses using ARP packets
> with source _and_
> destination address set to the address in question. So of
> course Linux won't answer it!
> But I can't find a single word in the RFC2131
> (
> saying that the
> Source Address _must_ set to!!!!

It is actually in RFC1541 "... The client may
   perform a check on the suggested address to ensure that the address
   is not already in use.  For example, if the client is on a network
   that supports ARP, the client may issue an ARP request for the
   suggested request.  When broadcasting an ARP request for the
   suggested address, the client must fill in its own hardware address
   as the sender's hardware address, and 0 as the sender's IP address,
   to avoid confusing ARP caches in other hosts on the same subnet."


Dave Ellis
SIXNET - "Leading the Industrial Ethernet Revolution"
331 Ushers Road,   P.O. Box 767, Clifton Park, NY 12065 USA
Tel +1 (518) 877-5173   Fax +1 (518) 877-8346
Email me at: dge at
Detailed product info:

** Sent via the linuxppc-embedded mail list. See

More information about the Linuxppc-embedded mailing list