Hi Noam,
I was about to say you could sniff how windows 7+ does it; but I don't
think they would do it in an elegant, not even standard, way... ;^)
I don't know if I get the whole picture, but I bet your problem is an
"application ping". Do you actually need to know link is present or
another device like yours or server or @ access or ?
Yes, ICMP Echo Requests might be discarded by the router, I think it is
a bad idea on an internal network, but some admins think otherwise.
That is why I suggest "application ping", as long as your devices can
see each other, you know you have a link. It is usually done on a
separate UDP port, but some guys like to dedicate in-band commands to
that purpose, like a keep-alive message. What I suggest is sort of a
discovery protocol on UDP broadcasts, or a directed app ping if you know
your neighbors addresses.
Toying with your DHCP server every half a second might pester some net
admins and get you enemies for free... I wouldn't go that way, I think
your application's problems have to be solved by your application. Just
my 2 cents.
Regards!
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