Today I solved a networking problem that was caused because the speed and duplex of a network interface on a printer was set to 100 Mbit/full duplex. Both the printer and the switch it was connected to were gigabit ethernet interfaces. With the switch set to autonegotiation I ended up with a link that was 100/full on the printer side and 100/half on the switch side. Printing seemed to work but users complained about scans being slow. After setting the printer to do autonegotiation I ended up with a gigabit link and everything was well.
My question: what would be a valid reason for using any other setting than autonegotiate other than "there was a problem so we fiddled with it and this seems to work"? Backwards compatibility for very old networking gear perhaps?
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