[c-nsp] Re-thinking (remembering) how a switch operates
Niels Bakker
niels=cisco-nsp at bakker.net
Fri May 6 18:34:54 EDT 2005
* gert at greenie.muc.de (Gert Doering) [Thu 05 May 2005, 09:24 CEST]:
>On Wed, May 04, 2005 at 06:35:06PM +0200, Andre Beck wrote:
>>End stations of today usually have ARP cache timeouts of 120s to 300s.
>At least Linux is doing IPv4 ARP timeouting these days similar to way
>IPv6 NUD works - "if we see no traffic from this IP/MAC combination for
>a while, we do some ARP probing. Otherwise we assume that it's still
>valid" - which is a good thing in large networks, avoiding unnecessary
>ARPs...
Except they do that after 30 seconds, which makes Linux boxes generate
insane amounts of ARP traffic compared to any other host.
-- Niels.
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