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Using B43, when connected with wireless, only some sites, like google, youtube and wikipedia work and most others simply return server not found. All work when using the ethernet port.
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It's a bit of a shot in the dark, but have you tried disabling IPv6?
I have to disable IPv6 when on my works network or I can't connect to much of anything.
"UNIX is simple and coherent..." - Dennis Ritchie, "GNU's Not UNIX" - Richard Stallman
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