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f7fa522e95
in the man page. ifconfig -au affects all interfaces marked as up, and ifconfig -ad affects only the interfaces marked down. ifconfig -a still handles everything. This change is purely for compatibility with SunOS, for those who might be accustomed to the SunOS ifconfig's behavior.
306 lines
10 KiB
Groff
306 lines
10 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)ifconfig.8 8.3 (Berkeley) 1/5/94
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.\"
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.Dd January 5, 1994
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.Dt IFCONFIG 8
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.Os BSD 4.2
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.Sh NAME
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.Nm ifconfig
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.Nd configure network interface parameters
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.Sh SYNOPSIS
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.Nm ifconfig
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.Ar interface address_family
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.Oo
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.Ar address
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.Op Ar dest_address
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.Oc
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.Op Ar parameters
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.Nm ifconfig
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.Ar interface
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.Op Ar protocol_family
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.Nm ifconfig
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.Ar -a
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.Nm ifconfig
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.Ar -au
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.Nm ifconfig
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.Ar -ad
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.Sh DESCRIPTION
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.Nm Ifconfig
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is used to assign an address
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to a network interface and/or configure
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network interface parameters.
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.Nm Ifconfig
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must be used at boot time to define the network address
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of each interface present on a machine; it may also be used at
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a later time to redefine an interface's address
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or other operating parameters.
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.Pp
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Available operands for
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.Nm ifconfig:
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.Bl -tag -width Ds
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.It Ar Address
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For the
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.Tn DARPA-Internet
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family,
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the address is either a host name present in the host name data
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base,
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.Xr hosts 5 ,
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or a
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.Tn DARPA
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Internet address expressed in the Internet standard
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.Dq dot notation .
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For the Xerox Network Systems(tm) family,
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addresses are
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.Ar net:a.b.c.d.e.f ,
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where
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.Ar net
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is the assigned network number (in decimal),
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and each of the six bytes of the host number,
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.Ar a
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through
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.Ar f ,
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are specified in hexadecimal.
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The host number may be omitted on 10Mb/s Ethernet interfaces,
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which use the hardware physical address,
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and on interfaces other than the first.
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For the
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.Tn ISO
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family, addresses are specified as a long hexadecimal string,
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as in the Xerox family. However, two consecutive dots imply a zero
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byte, and the dots are optional, if the user wishes to (carefully)
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count out long strings of digits in network byte order.
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.It Ar address_family
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Specifies the
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.Ar address family
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which affects interpretation of the remaining parameters.
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Since an interface can receive transmissions in differing protocols
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with different naming schemes, specifying the address family is recommeded.
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The address or protocol families currently
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supported are
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.Dq inet ,
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.Dq iso ,
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and
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.Dq ns .
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.It Ar Interface
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The
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.Ar interface
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parameter is a string of the form
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.Dq name unit ,
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for example,
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.Dq en0
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.El
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.Pp
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The following parameters may be set with
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.Nm ifconfig :
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.Bl -tag -width dest_addressxx
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.It Cm alias
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Establish an additional network address for this interface.
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This is sometimes useful when changing network numbers, and
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one wishes to accept packets addressed to the old interface.
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.It Cm arp
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Enable the use of the Address Resolution Protocol in mapping
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between network level addresses and link level addresses (default).
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This is currently implemented for mapping between
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.Tn DARPA
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Internet
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addresses and 10Mb/s Ethernet addresses.
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.It Fl arp
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Disable the use of the Address Resolution Protocol.
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.It Cm broadcast
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(Inet only)
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Specify the address to use to represent broadcasts to the
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network.
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The default broadcast address is the address with a host part of all 1's.
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.It Cm debug
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Enable driver dependent debugging code; usually, this turns on
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extra console error logging.
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.It Fl debug
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Disable driver dependent debugging code.
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.It Cm delete
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Remove the network address specified.
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This would be used if you incorrectly specified an alias, or it
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was no longer needed.
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If you have incorrectly set an NS address having the side effect
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of specifying the host portion, removing all NS addresses will
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allow you to respecify the host portion.
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.It Cm dest_address
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Specify the address of the correspondent on the other end
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of a point to point link.
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.It Cm down
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Mark an interface ``down''. When an interface is
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marked ``down'', the system will not attempt to
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transmit messages through that interface.
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If possible, the interface will be reset to disable reception as well.
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This action does not automatically disable routes using the interface.
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.It Cm ipdst
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This is used to specify an Internet host who is willing to receive
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ip packets encapsulating NS packets bound for a remote network.
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An apparent point to point link is constructed, and
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the address specified will be taken as the NS address and network
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of the destination.
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IP encapsulation of
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.Tn CLNP
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packets is done differently.
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.It Cm metric Ar n
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Set the routing metric of the interface to
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.Ar n ,
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default 0.
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The routing metric is used by the routing protocol
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.Pq Xr routed 8 .
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Higher metrics have the effect of making a route
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less favorable; metrics are counted as addition hops
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to the destination network or host.
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.It Cm mtu Ar n
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Set the maximum transmission unit of the interface to
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.Ar n ,
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default is interface specific.
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The mtu is used to limit the size of packets that are transmitted on an
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interface.
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Not all interfaces support setting the mtu, and some interfaces have
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range restrictions.
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.It Cm netmask Ar mask
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(Inet and ISO)
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Specify how much of the address to reserve for subdividing
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networks into sub-networks.
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The mask includes the network part of the local address
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and the subnet part, which is taken from the host field of the address.
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The mask can be specified as a single hexadecimal number
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with a leading 0x, with a dot-notation Internet address,
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or with a pseudo-network name listed in the network table
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.Xr networks 5 .
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The mask contains 1's for the bit positions in the 32-bit address
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which are to be used for the network and subnet parts,
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and 0's for the host part.
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The mask should contain at least the standard network portion,
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and the subnet field should be contiguous with the network
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portion.
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.\" see
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.\" Xr eon 5 .
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.It Cm nsellength Ar n
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.Pf ( Tn ISO
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only)
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This specifies a trailing number of bytes for a received
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.Tn NSAP
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used for local identification, the remaining leading part of which is
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taken to be the
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.Tn NET
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(Network Entity Title).
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The default value is 1, which is conformant to US
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.Tn GOSIP .
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When an ISO address is set in an ifconfig command,
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it is really the
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.Tn NSAP
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which is being specified.
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For example, in
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.Tn US GOSIP ,
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20 hex digits should be
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specified in the
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.Tn ISO NSAP
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to be assigned to the interface.
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There is some evidence that a number different from 1 may be useful
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for
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.Tn AFI
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37 type addresses.
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.It Cm trailers
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Request the use of a ``trailer'' link level encapsulation when
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sending (default).
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If a network interface supports
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.Cm trailers ,
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the system will, when possible, encapsulate outgoing
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messages in a manner which minimizes the number of
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memory to memory copy operations performed by the receiver.
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On networks that support the Address Resolution Protocol (see
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.Xr arp 4 ;
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currently, only 10 Mb/s Ethernet),
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this flag indicates that the system should request that other
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systems use trailers when sending to this host.
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Similarly, trailer encapsulations will be sent to other
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hosts that have made such requests.
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Currently used by Internet protocols only.
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.It Fl trailers
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Disable the use of a ``trailer'' link level encapsulation.
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.It Cm link[0-2]
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Enable special processing of the link level of the interface.
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These three options are interface specific in actual effect, however,
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they are in general used to select special modes of operation. An example
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of this is to enable SLIP compression. Currently, only used by SLIP.
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.It Fl link[0-2]
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Disable special processing at the link level with the specified interface.
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.It Cm up
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Mark an interface ``up''.
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This may be used to enable an interface after an ``ifconfig down.''
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It happens automatically when setting the first address on an interface.
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If the interface was reset when previously marked down,
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the hardware will be re-initialized.
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.El
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.Pp
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.Pp
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.Nm Ifconfig
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.Ar -a
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displays information on all interfaces. When followed by a configuration
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parameter, it will also set the configuration on all interfaces.
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.Pp
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.Nm Ifconfig
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.Ar -au
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is similar to
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.Nm ifconfig
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.Ar -a ,
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except it only affects interfaces that are currently marked as up.
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Conversely,
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.Nm ifconfig
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.Ar -ad
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affects only interfaces that are marked down.
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.Pp
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.Nm Ifconfig
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displays the current configuration for a network interface
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when no optional parameters are supplied.
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If a protocol family is specified,
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Ifconfig will report only the details specific to that protocol family.
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.Pp
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Only the super-user may modify the configuration of a network interface.
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.Sh DIAGNOSTICS
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Messages indicating the specified interface does not exit, the
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requested address is unknown, or the user is not privileged and
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tried to alter an interface's configuration.
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.Sh SEE ALSO
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.Xr netstat 1 ,
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.Xr netintro 4 ,
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.Xr rc 8 ,
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.Xr routed 8 ,
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.\" .Xr eon 5
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.2 .
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