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Re: This (new to me) ip thingy




	Hi.

On Tue, Oct 03, 2017 at 04:04:56AM -0400, Gene Heskett wrote:
> On Tuesday 03 October 2017 03:02:42 Reco wrote:
> 
> > ip -r n s
> returns this unsorted list:
> rock64Sheldon.coyote.den dev eth0 lladdr 3e:1b:98:17:e3:8c STALE
> scanner.coyote.den dev eth0 lladdr 30:05:5c:8a:2d:c8 STALE
> picnc.coyote.den dev eth0 lladdr b8:27:eb:d3:47:2d STALE
> lathe.coyote.den dev eth0 lladdr 38:60:77:cd:f3:2f STALE
> router.coyote.den dev eth0 lladdr 4c:e6:76:ad:34:0a STALE
> GO704.coyote.den dev eth0 lladdr 00:1a:a0:a7:a8:d4 STALE
> shop.coyote.den dev eth0 lladdr 38:60:77:4e:38:1b STALE
> 
> No clue why it should mark them all as stale except they've been up since 
> the last power failure. This room is the only UPS and not all of it is 
> on the UPS.  I also have a 20kw nat-gas standby in the backyard, so 
> failures are just short enough to screw up the auto-reboot settings.

STALE has nothing to do with it. A typical ARP record (MAC-IP
correspondence) has very limited lifetime (30 seconds by default IIRC).
STALE shows you that this host haven't send any packets to these hosts
in last 30 seconds.

Also, ip-neighbour(8).


> >Frankly I'm not surprised that it failed to resolve 224.0.0.251. Nobody
> >sane would add a DNS record for this anyway.
> 
> I think thats from avahi, is definitely is not anything I have 
> configured.

Multicasts are not anything that *anyone* should configure.
The whole idea of them is that your L2 network segment configures by
itself.

Reco