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RedHat 9 (Linux i386) - man page for ifconfig (redhat section 8)

IFCONFIG(8)			    Linux Programmer's Manual			      IFCONFIG(8)

       ifconfig - configure a network interface

       ifconfig [interface]
       ifconfig interface [aftype] options | address ...

       Ifconfig  is used to configure the kernel-resident network interfaces.  It is used at boot
       time to set up interfaces as necessary.	After that, it is usually only needed when debug-
       ging or when system tuning is needed.

       If  no  arguments  are  given, ifconfig displays the status of the currently active inter-
       faces.  If a single interface argument is given, it  displays  the  status  of  the  given
       interface  only;  if  a	single -a argument is given, it displays the status of all inter-
       faces, even those that are down.  Otherwise, it configures an interface.

Address Families
       If the first argument after the interface name is recognized as the name  of  a	supported
       address	family,  that  address	family	is  used for decoding and displaying all protocol
       addresses.  Currently supported address families include  inet  (TCP/IP,  default),  inet6
       (IPv6),	ax25  (AMPR  Packet  Radio), ddp (Appletalk Phase 2), ipx (Novell IPX) and netrom
       (AMPR Packet radio).

	      The name of the interface.  This is usually a driver name followed by a  unit  num-
	      ber, for example eth0 for the first Ethernet interface.

       up     This  flag  causes the interface to be activated.  It is implicitly specified if an
	      address is assigned to the interface.

       down   This flag causes the driver for this interface to be shut down.

       [-]arp Enable or disable the use of the ARP protocol on this interface.

	      Enable or disable the promiscuous mode of the interface.	If selected, all  packets
	      on the network will be received by the interface.

	      Enable  or  disable  all-multicast mode.	If selected, all multicast packets on the
	      network will be received by the interface.

       metric N
	      This parameter sets the interface metric.

       mtu N  This parameter sets the Maximum Transfer Unit (MTU) of an interface.

       dstaddr addr
	      Set the remote IP address for a point-to-point link (such as PPP).  This keyword is
	      now obsolete; use the pointopoint keyword instead.

       netmask addr
	      Set the IP network mask for this interface.  This value defaults to the usual class
	      A, B or C network mask (as derived from the interface IP address), but  it  can  be
	      set to any value.

       add addr/prefixlen
	      Add an IPv6 address to an interface.

       del addr/prefixlen
	      Remove an IPv6 address from an interface.

       tunnel aa.bb.cc.dd
	      Create a new SIT (IPv6-in-IPv4) device, tunnelling to the given destination.

       irq addr
	      Set the interrupt line used by this device.  Not all devices can dynamically change
	      their IRQ setting.

       io_addr addr
	      Set the start address in I/O space for this device.

       mem_start addr
	      Set the start address for shared memory used by this device.  Only  a  few  devices
	      need this.

       media type
	      Set the physical port or medium type to be used by the device.  Not all devices can
	      change this setting, and those that can vary in what values they support.   Typical
	      values  for  type  are 10base2 (thin Ethernet), 10baseT (twisted-pair 10Mbps Ether-
	      net), AUI (external transceiver) and so on.  The special medium type of auto can be
	      used  to	tell  the  driver to auto-sense the media.  Again, not all drivers can do

       [-]broadcast [addr]
	      If the address argument is given, set  the  protocol  broadcast  address	for  this
	      interface.  Otherwise, set (or clear) the IFF_BROADCAST flag for the interface.

       [-]pointopoint [addr]
	      This  keyword enables the point-to-point mode of an interface, meaning that it is a
	      direct link between two machines with nobody else listening on it.
	      If the address argument is also given, set the protocol address of the  other  side
	      of  the link, just like the obsolete dstaddr keyword does.  Otherwise, set or clear
	      the IFF_POINTOPOINT flag for the interface.

       hw class address
	      Set the hardware address of this interface, if  the  device  driver  supports  this
	      operation.   The keyword must be followed by the name of the hardware class and the
	      printable ASCII equivalent of the hardware  address.   Hardware  classes	currently
	      supported  include  ether  (Ethernet),  ax25  (AMPR AX.25), ARCnet and netrom (AMPR

	      Set the multicast flag on the interface. This should not normally be needed as  the
	      drivers set the flag correctly themselves.

	      The IP address to be assigned to this interface.

       txqueuelen length
	      Set  the	length	of  the transmit queue of the device. It is useful to set this to
	      small values for slower devices with a high latency (modem links, ISDN) to  prevent
	      fast bulk transfers from disturbing interactive traffic like telnet too much.

       Since  kernel  release 2.2 there are no explicit interface statistics for alias interfaces
       anymore. The statistics printed for  the  original  address  are  shared  with  all  alias
       addresses  on  the same device. If you want per-address statistics you should add explicit
       accounting rules for the address using the ipchains(8) command.

       Interrupt problems  with  Ethernet  device  drivers  fail  with	EAGAIN.  See  http://ces-
       dis.gsfc.nasa.gov/linux/misc/irq-conflict.html for more information.


       While  appletalk  DDP  and  IPX addresses will be displayed they cannot be altered by this

       route(8), netstat(8), arp(8), rarp(8), ipchains(8)

       Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
       Alan Cox, <Alan.Cox@linux.org>
       Phil Blundell, <Philip.Blundell@pobox.com>
       Andi Kleen

net-tools				  14 August 2000			      IFCONFIG(8)

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