Apple Mac OS X Server Managing Network Interface Information, Viewing or Changing MTU Values

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Managing Network Interface Information

This section describes commands you address to a specific hardware device (for example, en0) or port (for example, Built-in Ethernet).

If you prefer to work with network port configurations following the approach used in the Network preferences pane of System Preferences, see the commands in “Managing Network Port Configurations” on page 65.

Viewing Port Names and Hardware Addresses

To list all port names:

$ serversetup -getAllPort

To list all port names with their Ethernet (MAC) addresses:

$ sudo networksetup -listallhardwareports

To list hardware port information by port configuration:

$ sudo networksetup -listallnetworkservices

An asterisk (*) in the results marks an inactive configuration.

To view the default (en0) Ethernet (MAC) address of the server:

$ serversetup -getMacAddress

To view the Ethernet (MAC) address of a particular port:

$ sudo networksetup -getmacaddress (devicename"portname")

To scan for new hardware ports:

$ sudo networksetup -detectnewhardware

This command checks the computer for new network hardware and creates a default configuration for each new port.

Viewing or Changing MTU Values

All data that is transmitted over a network travels in data packets. The size of the data packets is called maximum transmission units (MTU), which if too large or too small will affect performance. You can use the networksetup tool to change the 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")

Chapter 6 Setting Network Preferences