Impact of ARP lookup on local NTP traffic

[Gary E. Miller]

Yo Frank!

On Tue, 31 May 2016 13:10:36 -0400
Frank Nicholas <frank at nicholasfamilycentral.com> wrote:

> > 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).

Wow, 20 mins, that is great.

So we have:

	Cisco : 4 hours
	OS X: 20 minutes
	Linux: 60 seconds
	Vista: 15 to 45 seconds.

Clearly no concensus...

> Is that what you were looking for on OS X?

Yes, thank you!

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588
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