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All the Perl that's Practical to Extract and Report

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  • Those symptoms sound like path MTU discovery going bad, and you send a full-sized packet that gets fragmented, and somewhere a router has the DF bit set. Or something like that, it's been a while.

    The problem is that when you fling small packets around you never reach the upper limit that causes bad things to happen. So pings and this and that go fine. It's only when you start sending big packets that things go bad.

    In short, try dropping the MTU on the interface down by 50 byte increments and see if throughput improves. If you wind up having halved the MTU, then it's something else, so you may as well go back to where you started from and try something different.

    • Good call. I'll give that a shot. I guess my next question is: why Ubuntu and not XP/OSX? Maybe their wireless drivers auto adjust better than madwifi.
    • Nope. Didn't make a crap of different. I did check OSX. The mtu is 1500 over wireless.