Mac OS X Server Command-Line Administration - Apple

Viewing or Changing MTU Values
You can use these commands to change the maximum transmission unit (MTU) size for
a port.
To view the MTU value for a hardware port:
$ sudo networksetup -getMTU (devicename|"portname")
To list valid MTU values for a hardware port:
$ sudo networksetup -listvalidMTUrange (devicename|"portname")
To change the MTU value for a hardware port:
$ sudo networksetup -setMTU (devicename|"portname")
Viewing or Changing Media Settings
To view the media settings for a port:
$ sudo networksetup -getMedia (devicename|"portname")
To list valid media settings for a port:
$ sudo networksetup -listValidMedia (devicename|"portname")
To change the media settings for a port:
$ sudo networksetup -setMedia (devicename|"portname") subtype [option1]
[option2] [...]
Network Port Configurations
Network port configurations are sets of network preferences that can be assigned to a
particular network interface and then enabled or disabled. The Network pane of
System Preferences stores and displays network settings as port configurations.
Creating or Deleting Port Configurations
To list existing port configuration:
$ sudo networksetup -listallnetworkservices
To create a port configuration:
$ sudo networksetup -createnetworkservice configuration hardwareport
To duplicate a port configuration:
$ sudo networksetup -duplicatenetworkservice configuration newconfig
To rename a port configuration:
$ sudo networksetup -renamenetworkservice configuration newname
To delete a port configuration:
$ sudo networksetup -removenetworkservice configuration
Activating Port Configurations
To see if a port configuration is on:
$ sudo networksetup -getnetworkserviceenabled configuration
38 Chapter 5 Network Preferences