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MTU Changed in Cable Modem?


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Is it possible that a Motorola SB 5120 has a preset for MTU? I haven't been able to find a way to check this, as I am trying to determine what has dropped my MTU down to 1440. I'm on Mediacom cable, if that makes any difference. My registry has the proper DWORD value for 1500 MTU, yet all tests show it to be 1440.

This happens on *any* machine on my network, so I suspect it is somewhere external to the machines. I also have Netgear router, which does have an MTU setting, and it is at 1500.

Any info appreciated.


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