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Date:      Fri, 29 May 1998 12:01:53 -0400 (EDT)
From:      Mike <mike@seidata.com>
To:        Brian Somers <brian@Awfulhak.org>
Cc:        Fernando Schapachnik <fpscha@ns1.sminter.com.ar>, hackers@FreeBSD.ORG
Subject:   Re: arplook 
Message-ID:  <Pine.BSF.3.96.980529115501.16830B-100000@ns1.seidata.com>
In-Reply-To: <199805290648.HAA01057@awfulhak.org>

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On Fri, 29 May 1998, Brian Somers wrote:

[snip]
> > > arplookup 102.255.209.107 failed: host is not on local network
> > > arplookup 102.255.207.132 failed: host is not on local network
[snip]

I've encountered this as well...  I asked a guru contact of mine and this
is what he had to say:

<transcript>

> Also, looking over 'messages' on ns1 today and I have some questions
> about the following errors:
>
> 'arplookup 1.2.3.45 failed: host is not on local network'
>
> I think we established that this one was related to improper usage of
> subnet masks before...  I'm getting sick of seeing dmesg flooded with
> these.  Is this definately a subnet/subnet mask issue?

This is actually caused because the server has some IP addresses from
1.2.3.X on it and so it believes it should be able to create an
arp entry for 1.2.3.45 but then notices that it can't because
it isn't on the same network :)

The solution is to move 1.2.3.45 to the 4.5.6 subnet along
with every other device on the LAN there... 1 LAN, 1 subnet... thats
the goal. This raises the issues of virtual addresses and async 
addresses also... but I'd definately start with the actual LAN
devices. Move every ethernet device to the 4.5.6 subnet.  Routing will
work better, accesses will be quicker, etc...

</transcript>

'ns1' is on the '4.5.6' class C with 30-40 '1.2.3' aliases.  Hope it
helps...

---
 Mike Hoskins				Email: mike@seidata.com
 SEI Data Network Services, Inc.	  WWW: http://www.seidata.com
 P.O. Box 7, 14005 U.S. 50 (BLD2)	Voice: 800.925.6746 ex. 251
 Dillsboro, IN 47018			  Fax: 812.744.8000


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