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Re: Duplex
If you fix the speed and duplex of only ONE end of a connection - ie the router but not the cable modem you will always get a duplex mismatch. Ie the router will be fixed at 100 / Full but the modem will then negotiate 100 / Half and you will end up getting collisions on the link between the two causing performance issues.
Duplex auto-negotation at 100 Mb/s only works correctly if both ends of link are set to auto.
This is why you are seeing better performance with the router at auto as then both it and the cable modem will negotiate correctly.
Since the cable modem doesn't have a fixed speed/duplex option the device connectd to it shoudl always be set to auto negotiate.
If you want to use fixed speed/duplex settings then you have to ensure both ends of a given connection are fixed.
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