IFCONFIG(1M-SysV) RISC/os Reference Manual IFCONFIG(1M-SysV)
NAME
ifconfig - configure network interface parameters
SYOPNSIS
/etc/ifconfig interface address_family [ address [
dest_address ] ] [ parameters ]
/etc/ifconfig interface [ protocol_family ]
DESCRIPTION
ifconfig is used to assign an address to a network interface
and/or configure network interface parameters. ifconfig
must be used at boot time to define the network address of
each interface present on a machine; it may also be used at
a later time to redefine an interface's address or other
operating parameters. The interface parameter is a string
of the form ``name unit'', e.g. ``en0''.
Since an interface may receive transmissions in differing
protocols, each of which may require separate naming
schemes, it is necessary to specify the address_family,
which may change the interpretation of the remaining parame-
ters. The address families currently supported are ``inet''
and ``ns''.
For the DARPA-Internet family, the address is either a host
name present in the host name data base, hosts(4), or a
DARPA Internet address expressed in the Internet standard
``dot notation''. For the Xerox Network Systems(tm) family,
addresses are net:a.b.c.d.e.f, where net is the assigned
network number (in decimal), and each of the six bytes of
the host number, a through f, are specified in hexadecimal.
The host number may be omitted on 10Mb/s Ethernet inter-
faces, which use the hardware physical address, and on
interfaces other than the first.
The following parameters may be set with ifconfig:
up Mark an interface ``up''. This may be used to
enable an interface after an ``ifconfig down.''
It happens automatically when setting the first
address on an interface. If the interface was
reset when previously marked down, the hardware
will be re-initialized.
down Mark an interface ``down''. When an interface is
marked ``down'', the system will not attempt to
transmit messages through that interface. If pos-
sible, the interface will be reset to disable
reception as well. This action does not automati-
cally disable routes using the interface.
trailers Request the use of a ``trailer'' link level
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encapsulation when sending (default). If a net-
work interface supports trailers, the system will,
when possible, encapsulate outgoing messages in a
manner which minimizes the number of memory to
memory copy operations performed by the receiver.
On networks that support the Address Resolution
Protocol (see arp(7P); currently, only 10Mb/s Eth-
ernet), this flag indicates that the system should
request that other systems use trailers when send-
ing to this host. Similarly, trailer encapsula-
tions will be sent to other hosts that have made
such requests. Currently used by Internet proto-
cols only.
-trailers Disable the use of a ``trailer'' link level encap-
sulation.
arp Enable the use of the Address Resolution Protocol
in mapping between network level addresses and
link level addresses (default). This is currently
implemented for mapping between DARPA Internet
addresses and 10Mb/s Ethernet addresses.
-arp Disable the use of the Address Resolution Proto-
col.
metric n Set the routing metric of the interface to n,
default 0. The routing metric is used by the
routing protocol (routed(1M)). Higher metrics
have the effect of making a route less favorable;
metrics are counted as addition hops to the desti-
nation network or host.
rarp Enable the use of the Reverse Address Resolution
Protocol when mapping link level addresses and
network level addresses. This is currently imple-
mented for mapping between 10Mb/s Ethernet
addresses and DARPA Internet addresses.
-rarp Disable the use of the Reverse Addresses Resolu-
tion Protocol (Default).
promarp Enable proxy replies to Address Resolution Proto-
col requests. This permits machines connected to
multiple 10Mb/s Ethernets to respond to ARP
requests for hosts on other Ethernets in a proxy
fashion.
-promarp Disable the use of promiscuous ARP (Deault).
debug Enable driver dependent debugging code; usually,
this turns on extra console error logging.
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-debug Disable driver dependent debugging code.
netmask mask
(Inet only) Specify how much of the address to
reserve for subdividing networks into sub-
networks. The mask includes the network part of
the local address and the subnet part, which is
taken from the host field of the address. The
mask can be specified as a single hexadecimal
number with a leading 0x, with a dot-notation
Internet address, or with a pseudo-network name
listed in the network table. The mask contains
1's for the bit positions in the 32-bit address
which are to be used for the network and subnet
parts, and 0's for the host part. The mask should
contain at least the standard network portion, and
the subnet field should be contiguous with the
network portion.
dstaddr Specify the address of the correspondent on the
other end of a point to point link.
broadcast (Inet only) Specify the address to use to
represent broadcasts to the network. The default
broadcast address is the address with a host part
of all 1's.
ipdst (NS only) This is used to specify an Internet host
who is willing to receive ip packets encapsulating
NS packets bound for a remote network. In this
case, an apparent point to point link is con-
structed, and the address specified will be taken
as the NS address and network of the destinee.
ifconfig displays the current configuration for a network
interface when no optional parameters are supplied. If a
protocol family is specified, ifconfig will report only the
details specific to that protocol family.
Only the super-user may modify the configuration of a net-
work interface.
DIAGNOSTICS
Messages indicating the specified interface does not exit,
the requested address is unknown, or the user is not
privileged and tried to alter an interface's configuration.
SEE ALSO
rc0(1M), intro(7N).
netstat(1) in the User's Reference Manual.
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ORIGIN
4.3 BSD
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