The problem is seen in the first puzzle if you ping
pc0, and then edit the 0.0.0.0 gateway. It auto-fills in
the last-used pc0 IP address, and canceling saves that change
instead of leaving the gateway at 0.0.0.0.
lastIP nicely saves some typing (although it has also confused
my student quite a bit I think), but since it updates WhatToEdit,
that becomes the "saved" value even during a cancel.
Instead, save the original value as a copy, and set back to
the original value when cancellng.
Perhaps it would be worth creating a reparse( NB_IPAddress)
function, but this was easy to just hack together.
Tested by pinging pc0, then editing the gateway and cancellng,
editing the IP address and canceling.
Next: don't add a canceled route
Tim Young
06eb896558
