gdt@ir.bbn.com (Greg Troxel) writes:
> Linux has a mechanism that marks an arp entry fresh when a TCP packet
> is received that acks something, as that validates that the arp entry
> at least caused the packet to get delivered.

Thats an interesting idea but it has to be done carefully when one is
dealing with proxy-arps and wireless access points.  A mobile user
might have moved out of range of one AP and onto another.  The TCP
stream would still be following them, but "their" MAC address has
changed.  (Or perhaps the linux folks are counting on the AP's sending
gratuitous arps when the users shift from one to the other???)

-wolfgang