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I have a problem with internet explorer (ver. 6.0.2900.2180.xpsp_sp2_rtm.040803-2158).
The problem is that I can’t view any site. They work fine with mozilla (ver. 1.0.6) but not with IE. It does...

Yes, it must be a gateway.
The only time you don't need a gateway is when you have
Communication between computers on the same network
(with the same mask).

But you have to give us some more...