> On May 31, 2016, at 12:18 PM, Gary E. Miller <g...@rellim.com> wrote:
>
> RFC 826 defines ARP. It makes no mention of how long the timeout
> should be.
>
> Cisco uses 4 hours.
>
> I can not find the info on OS X.
From `man 4 arp` on OS X (El Capitan):
The ARP cache is stored in the system routing table as dynamically-created host
routes. The route to a directly-attached Ethernet network is installed as a
``cloning'' route (one with the RTF_CLONING flag set), causing routes to
individual hosts on that network to be created on demand. These routes time
out periodically (normally 20 minutes after validated; entries are not
validated when not in use).
Is that what you were looking for on OS X?
Thanks,
Frank
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