Impact of ARP lookup on local NTP traffic

[Frank Nicholas]

> On May 31, 2016, at 12:18 PM, Gary E. Miller <gem at 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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