Technical data

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ifconﬁg

Assigns an address to a network interface, and conﬁgures and displays network

interface parameters.

Format

ifconﬁg interface_id [address_family][address[/bitmask]] [dest_address][parameters]

ifconﬁg -a [-d] [-u] [-v] [address_family]

ifconﬁg -l [-d] [-u] [-v] [address_family]

ifconﬁg [-v] interface-id [address_family]

Description

Use the

ifconfig

command to deﬁne the network address of each interface. You

can also use the

ifconfig

command at other times to display all interfaces that

are conﬁgured on a system, to redeﬁne the address of an interface, or to set other

operating parameters.

Note

If you want to redeﬁne the interface address or the net mask, you should

stop TCP/IP Services. Otherwise, any TCP/IP process currently running

will continue to use the old address and net mask and will fail.

Any user can query the status of a network interface; only a privileged user can

modify the conﬁguration of network interfaces.

You specify an interface with the

ifconfig interface-id

syntax. (See your

hardware documentation for information on obtaining an interface ID.)

If you specify only interface-id, the

ifconfig

program displays the current

conﬁguration for the speciﬁed network interface only.

If a protocol family is speciﬁed by the address_family parameter,

ifconfig

reports

only the conﬁguration details speciﬁc to that protocol family.

When changing an interface conﬁguration, if the address family cannot be

inferred from the address parameter, an address family must be speciﬁed. The

address family is required because an interface can receive transmissions in

different protocols, each of which can require a separate naming scheme.

The address parameter is the network address of the interface being conﬁgured.

For the

inet

address family, the address parameter is either a host name or an

IP address in the standard dotted-decimal notation with or without the optional

Classless Inter-Domain Routing (CIDR) bit mask (/bitmask). If you specify

bitmask, do not use the netmask parameter.

The destination address (dest_address) parameter speciﬁes the address of the

correspondent on the remote end of a point-to-point link.

Troubleshooting Utilities Reference A–11