At 04:55 PM 2/18/00 -0800, Wolfgang Rupprecht wrote:
>
>phoffman@proper.com (Paul Hoffman) writes:
>> So if I ping some on my subnet (but not my own range of IPs, of course) 
>> that will cause it to say "who are you" and the router (the box I'm really 
>> interested in) will hear?
>
>Yes.  Thats how it should work.  As long as your machine tries to send
>a packet to the router you should be ok (if the router's arp stuff is
>written correctly).

Actually, now that you mention it, I recalled noticing that when I boot a
machine, it sends out an ARP request for its own IP:

01:45:16.464695 0:40:5:a3:a0:26 ff:ff:ff:ff:ff:ff 
                0806 60: arp who-has 10.0.20.129 tell 10.0.20.129

That should accomplish the same thing, shouldn't it? If so, the "program"
you're looking for is something already done by a machine when it boots
anyway.