You take the time to Dim $defaultgw but then use an undefined var $NIC.
Essentially, your code is:
$defaultgw = EnumIPInfo(,3)
or:
$defaultgw = EnumIPInfo(0,3)
It is only by the good grace of Ruud and his forgiving code that lets you get away with it. What if 0 isn't the NIC index you need? Your code is too optimistic.
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