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[Xen-devel] Re: [RFC] ARP notify option

On Tue, 6 Mar 2007, Chris Friesen wrote:
Stephen Hemminger wrote:
 +arp_notify - BOOLEAN
 +      Define mode for notification of address and device changes.
 +      0 - (default): do nothing
 +      1 - Generate gratuitous arp replies when device is brought up
 +          or hardware address changes.

Did you consider using gratuitous arp requests instead? I remember reading about some hardware that updated its arp cache on gratuitous requests but not gratuitous replies.

You might be interested in taking a look at:


There has been some follow-up discussion on this in the thread starting at:


In particular, you may be interested in this comment about ARP request and ARP reply for gratuitous ARP:


Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

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