Re: Ping a mac address

[neil () ncsconsulting com]

Quoting "Thor (Hammer of God)" <thor () hammerofgod com>:

> absence of an "already assigned" IP in the config. I had an extra
> camera in the closet (bad color element, but it still works).  I
> powered it up, added the MAC to an arbitrary IP via static ARP , and 
> captured the traffic while connecting.  The reply packet did
> indeed come *from* the arbitrary IP address during the 3-way and
> all subsequent HTTP replies.  When I went to config it, it already
> had the arbitrary IP in place.  Upon saving the config, I could
> remove the static entry and get to the unit with normal dynamic
> resolution.

As a related note, i was working with an IP addressable network print
server a number of years ago that had an interesting option to
configure its IP address: you could setup a static ARP entry in your
laptop then ping the device to assign it an IP address.  The device's
MAC was stamped on the back and once it acquired the IP address from
the ping packet it would assign that address and you could connect to
it (from the local network of course) for more detailed configuration.
 Also, once the address had been assigned you couldn't assign another
address without resetting it (using a pin to press a tiny hidden
switch).

At time (guessing 8-10 years ago) I thought that was a neat trick but
can't for the life of me remember the name of the device.  Could be
your camera also does that my design.


          -neil



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