On Tue, 15 Jan 2008, Roland Abt wrote:
Ian,
If my question is too general, it's because it was meant to be I am
interested in your experience with gratuitous ARP because I need to implement
a failover software that also will strongly rely on G.ARP when announcing a
IP/MAC address change. I do not know all Ethernet-capable devices every built
and how they react on G.ARP, so I appreciate if you share your experience
with me. My guess was that this is a vital issue for HA as well, but so far I
could not find a lot of resources on the net addressing this subject.
What I have in mind is something like the following list:
OS/Device Uses G.ARP Request for Uses G.ARP
Reply for
-------------------------------------------------------------------------------
Windows XP nothing nothing
Windows Vista only updating an arp entry nothing
Linux Kernel xxx nothing updating an
existing and inserting a new arp entry
Cisco IOS ... ...
...
we don't have a table like this. the details of getting things to work were
hashed out back in the very early days (go back to the earliest mailing list
archives). initially there was one method used, and it didn't work for all
devices, we identified a second method and the fact that it also didn't work for
all devices. We then tested that if we did both everything that people were
running into was handled, and it's worked ever since.
David Lang
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