ifconfig - configure a network interface
NAME
ifconfig - configure a network interface
SYNOPSIS
ifconfig [-v] [-a] [-s] [interface]
ifconfig [-v] interface [aftype] options | address ...
OPTIONS
-a display all interfaces which are currently available, even if down
-s display a short list (like netstat -i)
up This flag causes the interface to be activated. It is implicitly specified if an address is
assigned to the interface; you can suppress this behavior when using an alias interface by
appending an - to the alias (e.g. eth0:0-). It is also suppressed when using the IPv4
0.0.0.0 address as the kernel will use this to implicitly delete alias interfaces.
down This flag causes the driver for this interface to be shut down.
[-]promisc
Enable or disable the promiscuous mode of the interface. If selected, all packets on the
network will be received by the interface.
$ ifconfig -h
Usage:
ifconfig [-a] [-v] [-s] <interface> [[<AF>] <address>]
[add <address>[/<prefixlen>]]
[del <address>[/<prefixlen>]]
[[-]broadcast [<address>]] [[-]pointopoint [<address>]]
[netmask <address>] [dstaddr <address>] [tunnel <address>]
[outfill <NN>] [keepalive <NN>]
[hw <HW> <address>] [mtu <NN>]
[[-]trailers] [[-]arp] [[-]allmulti]
[multicast] [[-]promisc]
[mem_start <NN>] [io_addr <NN>] [irq <NN>] [media <type>]
[txqueuelen <NN>]
[[-]dynamic]
[up|down] ...
<HW>=Hardware Type.
List of possible hardware types:
loop (Local Loopback) slip (Serial Line IP) cslip (VJ Serial Line IP)
slip6 (6-bit Serial Line IP) cslip6 (VJ 6-bit Serial Line IP) adaptive (Adaptive Serial Line IP)
ash (Ash) ether (Ethernet) ax25 (AMPR AX.25)
netrom (AMPR NET/ROM) rose (AMPR ROSE) tunnel (IPIP Tunnel)
ppp (Point-to-Point Protocol) hdlc ((Cisco)-HDLC) lapb (LAPB)
arcnet (ARCnet) dlci (Frame Relay DLCI) frad (Frame Relay Access Device)
sit (IPv6-in-IPv4) fddi (Fiber Distributed Data Interface) hippi (HIPPI)
irda (IrLAP) ec (Econet) x25 (generic X.25)
eui64 (Generic EUI-64)
<AF>=Address family. Default: inet
List of possible address families:
unix (UNIX Domain) inet (DARPA Internet) inet6 (IPv6)
ax25 (AMPR AX.25) netrom (AMPR NET/ROM) rose (AMPR ROSE)
ipx (Novell IPX) ddp (Appletalk DDP) ec (Econet)
ash (Ash) x25 (CCITT X.25)
# ifconfig # ifconfig eth0 <- only eth0
# ifconfig -a
-a display all interfaces which are currently available, even if down
$ ifconfig -s Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth0 1500 636048634 0 1481 0 81199240 0 0 0 BMRU lo 65536 1234171 0 0 0 1234171 0 0 0 LRU
# ifconfig eth0 up
# ifconfig eth0 down
# ifconfig add eth0 192.168.1.10 # ifconfig eth0 192.168.1.10 netmask 255.255.255.0 broadcast 192.168.1.1
# ifconfig del eth0 192.168.1.10
ifconfig <UP,BROADCAST,RUNNING,MULTICAST> <UP,BROADCAST,RUNNING,MULTICAST,PROMISC>
# ifconfig [NIC name] promisc
# ifconfig [NIC name] promisc off