- GUI: Go to the Network component of System Preferences, select
"Network Port Configurations" and duplicate the interface, give it
a new name and configure it.
Recommended, because it survives a restart.
- Command Line: Use ifconfig (man ifconfig) along the lines of
ifconfig en0 inet 123.456.789.666 netmask 255.255.255.255 alias
Not recommended, because you have to do this every time the machine
restarts.
Aloha mai Nai`a!
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