What you need to do is to limit the dl/up speed of LWs on each machine so they don't slow down the network [total bandwidth (up then down) available minus 25% / number of people using LW]. Go in Options -> downloads to limit dl speed, go in Options -> transfers -> basic to limit upload speed.

There is no way you'll be able to block totally LW from your netgear without serioulsy impairing basic internet traffic on your network. You would need a software solution acting as a router/gateway ie a linux/openbsd box.

Ciao

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