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70 Chapter 6 Setting Network Preferences
Enabling TCP/IP
Use the serversetup tool to enable or disable TCP/IP on a computer.
To enable TCP/IP on a particular port:
$ serversetup -EnableTCPIP [(
devicename
|"
portname
")]
If you don’t provide an interface, en0 is assumed.
To disable TCP/IP on a particular port:
$ serversetup -DisableTCPIP [(
devicename
|"
portname
")]
If you don’t provide an interface, en0 is assumed.
Working with VLANs
A virtual local area network (VLAN) connects devices that may be on separate physical
LANs to perform and communicate as if they were on the same physical LAN. Use the
networksetup tool to configure and modify a VLAN.
To create a VLAN:
$ networksetup -createVLAN
name
parentdevice
tag
To delete a VLAN:
$ networksetup -deleteVLAN
name
parentdevice
tag
To list available VLANs:
$ networksetup -listVLANs
To list the devices that support VLANs:
$ networksetup -listdevicesthatsupportVLAN
IEEE 802.3ad Ethernet Link Aggregation
Apple introduced the implementation of the IEEE 802.3ad Ethernet Link Aggregation
standard as part of the ifconfig tool. IEEE 802.3ad is a standard for bonding or
aggregating multiple Ethernet ports into one virtual interface. The aggregated ports
appear as a single IP address internally to your computer and tools and externally to
other clients on the Internet. Any tool or server that relies on your IP address will
continue to work seamlessly without any modifications. The advantage of aggregation
is that the virtual interface provides increased bandwidth by merging the bandwidth of
the individual ports. The TCP connection load is then balanced across the ports. In
addition to load balancing, IEEE 802.3ad provides automatic failover in the event any
port or cable fails. All traffic that was being routed over the failed port is automatically
rerouted to use one of the remaining ports. This failover is completely transparent to
the software using the connection. This feature provides increased bandwidth and
automatic failover for the server environment.