Re: arpresolve

[Jeff Nathan <jeff@wwti.com>]

Not to mention, ARP requests are broadcasts, everyone sees them.  When a
host broadcasts an ARP request, your machine caches the triplet
<protocol type, sender protocol address, sender hardware address> as
specified in RFC 826 and RFC 1122.  This is also a feature of
gratiuitous arp and a by-design mechanism to update the ARP cache of
machines on the network if somethinng on your host has changed.  In
fact, some systems send an ARP request at bootstrap purposely.

We should be happy that OpenBSD behaves this way and makes note of the
issue.

-Jeff


SethB@ClarkHill.com wrote:
> 
> > That's fairly clear, I think. The other machine should not be present on
> > this network, i.e a misconfigured network. (I could mention some RFCs
> > here... :)
> [snip]
> > Finally, I don't really see a point for having, say, a sysctl to disable
> > legitimate warnings such as these. Convince me otherwise and it might
> > happen. :)
> 
> There are legitimate reasons for wanting to run two logical subnets over the
> same physical network.  In particular, it can be very useful when
> renumbering a large network a few machines at a time.
> 
> Furthermore, if the message is intended to serve some diagnostic purpose,
> perhaps it should be rephrased for greater clarity.
> 
> --
> Seth L. Blumberg <sethb@clarkhill.com>
> Systems Analyst, Clark Hill PLC
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-- 
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"Common sense is the collection of prejudices acquired by age eighteen."
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