Originally posted by: SystemAdmin
You will need to disable the active interface to make these changes
ifconfig en0 down; ifconfig en0 detach
chdev -l 'ent0' -a media_speed='100_Full_Duplex'
Or
smitty chdev
-> Communication
Then adapter - etc and change 'media speed' by selecting with F4
ifconfig en0 attach
ifconfig en0 up
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