Firewall Detection

#11 (permalink)

July 18th, 2005

sberlin

Software Developer

Join Date: November 4th, 2002

Location: New York

Posts: 1,366

That kind of check isn't 100% correct. Routers open up ports all the time in response to simply using it. The way connections work is that when a program makes an outgoing one, it uses what's called an "ephemeral port", that is, a random port. Routers generally open up those ports for incoming access.

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