[Techtalk] arp

Jeff Dike jdike at karaya.com
Mon Nov 5 16:29:43 EST 2001

raven at oneeyedcrow.net said:
> No -- the router or whatever device will update the arp cache from the
> source of packets that it recieves.  So if it gets a packet from
> with a source MAC address of 0A:32:B4:whatever, it will
> automatically enter that into its arp cache.  So any machine that's
> sending packets (which would be most networked machines) should have
> an updated entry in the arp cache.

Hmmm, that sounds slightly bad to me.  I could imagine a little-used server
in a closet falling out of the router's arp cache.  Then someone on the wrong
side of the router would find it impossible to contact that machine...


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