Technical data

ifconfig
Flags
-a
Displays information about all interfaces that are configured on a system.
-d
Displays information about interfaces that are down.
-l
Displays interface names that are configured on a system.
-u
Displays information about interfaces that are up.
-v
Displays detailed information about interfaces, such as hardware addresses.
Parameters
alias alias_address[/bitmask]
Establishes an additional network address for this interface. This can be useful
when changing network numbers and you want to continue to accept packets
addressed to the old interface.
If you do not specify a bit mask or net mask with the alias address, the default
net mask is based on the alias address’s network class.
If you are using the optional bit mask argument, do not use the net mask
argument.
-alias alias_address
Removes the network address specified. This can be used if you incorrectly
specified an alias or if an alias is no longer needed. The -alias parameter
functions in the same manner as the delete parameter.
aliaslist address_list[/bitmask]
Establishes a range of additional network addresses for this interface. The range
can be a comma-separated list or a hyphenated list, and is inclusive. You can also
specify the optional CIDR bit mask (/bitmask) argument at the end of the list. Do
not use both a comma-separated list and a hyphenated list for a range.
-aliaslist
Removes a range of network addresses for this interface. This can be useful when
deleting network numbers and you want to keep the primary interface address.
The
-aliaslist rules are the same as for the aliaslist parameter.
allmulti
Enables the reception of all multicast packets.
-allmulti
Disables the reception of all multicast packets.
arp
Enables the use of the Address Resolution Protocol (ARP) in mapping between
network-level addresses and link-level addresses. This parameter is on by
default.
A–12 Troubleshooting Utilities Reference