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U.S. Robotics SureConnect ADSL Ethernet/USB Router User Guide
that is used in routing, indicating that this network is reachable through these interfaces. The mask
can be specified as a single hexadecimal number with a leading 0x, for example 0xffffff00, or with
a dot-notation Internet address of 255.255.255.00
broadcast <addr>
Broadcasting is used when it makes sense to send the same message to multiple recipients on the
LAN. This option is used to specify the broadcast address to be used in the network. The default
broadcast address is the address with a host part as all 1’s in the IP address. For example,
192.168.2.255 is a broadcast address for network 192.168.2.0
down
Mark an interface “down’’. When an interface is marked “down", the system will not attempt to
transmit messages through that interface.
up
Mark an interface “up’’. This may be used to enable an interface after an interface was
marked as “down’’. By enabling the interface, messages can be transmitted through that
interface.
mtu <n>
Sets the maximum transmission unit of the interface to n, the default is interface specific.
The MTU is used to limit the size of packets that are transmitted on an interface. Not all
interfaces support setting the MTU, and some interfaces, like ethernet, have range
restrictions (72 – 1500).
-a
Displays detailed information about all the interfaces.
-l
Lists the current interfaces.
Examples:
[root @ home] ifconfig –o -a
eth0: flags=ffff8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST>
mtu 1500 inet 192.168.2.185 netmask 0xffffff00 broadcast 192.168.2.255
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