On Saturday, 08/26/2006 at 07:41 EST, Harold Grovesteen
<[EMAIL PROTECTED]> wrote:
> Gratuitous ARP's are usually used to allow the registration of a MAC
> address into a Layer-2 switch's forwarding data base.  In essence, the
> gratuitous ARP lets the device tell the switch what physical port to use
> to send a frame when the MAC address is encountered as the destination
> MAC address in a frame.  They are also frequently encountered when a
> Layer-2 based virtual address changes host residency, for example
> Virtual Router Redundancy Protocol, as opposed to Layer-3 based virtual
> IP addresses which utilize a routing protocol such as OSPF to report
> it's new location.

Grat ARPs are absolutely required.  Trying to stop them would be a Bad
Thing.  The problem (IMO) is with the OAT IP address registration process,
not with grat ARPs, per se.

Alan Altmark
z/VM Development
IBM Endicott

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