I have manually set one interface to 10mbit, full duplex.
Network-Hardware
However, the setting is not sticking, if I reboot, the system defaults back to Auto negotiate.
(Settings below after manual reset again).
eth1 [Marvell Technology Group Ltd. Belkin F5D5005 Gigabit Desktop Network PCI Card]
Auto negotiation: Off
Link mode: 10 Mbps, fullduplex
Supported link modes: 10baseT/Full,10baseT/Half,100baseT/Full,100baseT/Half,1000baseT/Full
MAC Address: 00:30:bd:ba:ae:a5
Interrupt (IRQ): 50
PCI Device ID: 0x5005:0x5005
MII capable: No
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