On Jul 9, 8:13*pm, "Dave {Reply Address in.Sig}" <noon...@llondel.org>
wrote:

> If it's assigned by DHCP then chances are they'll both get the same one.

True. I can think of quite a few reasons they wouldn't get the same
one, but those are all rare.

> You'll find that very often there's a ping to an address as part of the DHCP
> transaction when a new address is assigned (as opposed to a refresh) just
> to check that there isn't already something out there using it.

Right, but we got here because we understand that 'ping' is not a good
test of IP usage.

> > You have to ask the network administrator.

> This is, of course, the best answer, especially if you happen to want a
> spare address for testing something.

Definitely.

In many cases, no response to an ARP query is good enough to find an
IP for short-term testing. It depends on how critical the network is,
of course.

DS