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ethtool is used for querying settings of an ethernet device and changing them. In this example I setup 100 Mb/s full duplex on my Linux Box
There are 4 alternatives - vote for the best!
If you can do better, submit your command here.
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This depends entirely on how the switch behaves/is configured. Configuration of speed and duplex, or autonegotiation must match.
With modern switches and NICs, nine times out of ten its better to leave this as autonegotiation.
Shouldn't your ethernet automatically come up at the fastest speed that works?
thanks for the comments, unfortunately there are always devices that working as they should, in this case I solved so