Use of Linux ifconfig command

ifconfig [-v] [-a] [-s] [INTERFACE]
ifconfig [-v] INTERFACE [aftype] OPTIONS | ADDRESS ...

-a
	Display the status of all interfaces, including those that are down.
	Displays a brief list of interface status, similar to netstat -i
-v
	Verbose mode, error message will be reported if an error occurs INTERFACE
	The name of the interface. This is usually a driver name followed by a unit number, such as eth0 for the first Ethernet interface.
up
	This flag causes the interface to be activated. If an address is assigned to an interface, the interface is implicitly activated down
	This flag is used to shut down the driver of the interface [-]arp
	Enable or disable the interface to use the ARP protocol [-]promisc
	Enable or disable promiscuous mode for an interface. If checked, all packets on the network will be received by the interface [-]allmulti
	Enable or disable all multicast modes. If checked, the interface will receive all multicast packets on the network (mtu N).
	Set the maximum transmission unit of the interface dstaddr ADDR
	Sets the remote IP address for point-to-point links such as PPP. The dstaddr keyword is now obsolete. Use the pointopoint keyword instead. netmask ADDR
	Sets the IP network mask for the interface. This value defaults to the usual class A, B, or C network mask (derived from the interface IP address), but can be set to any value add ADDR/PREFIX_LEN
	Add an IPv6 address to the interface del ADDR/PREFIX_LEN
	Remove the IPv6 address tunnel::aa.bb.cc.dd from the interface
	Creates a new SIT (IPv6-in-IPv4) device that tunnels to the given destination irq ADDR
	Sets the interrupt line used by this device. Not all devices can change their IRQ dynamically Set io_addr ADDR
	Set the starting address mem_start ADDR in the I/O space for the device
	Sets the starting address of shared memory used by this device. Only a few devices require this media TYPE
	Set the physical port or media type to be used by the device. Typical type values ​​are 10base2 (thin Ethernet), 10baseT (10Mbps Ethernet over twisted pair), AUI (external transceiver), etc. Special media types can use auto to tell the driver to automatically sense them. Note that not all devices can change this setting [-]broadcast [ADDR]
	If the address argument is given, sets the protocol broadcast address for this interface. Otherwise set (or clear) the IFF_BROADCAST flag of the interface [-]pointopoint [ADDR]
	This keyword enables point-to-point mode of the interface, which means it is a direct connection between two machines with nobody else listening on it. If the address argument is given, it sets the protocol address of the other end, just like the obsolete dstaddr keyword. Otherwise, set or clear the IFF_POINTOPOINT flag of the interface hw CLASS ADDR
	Sets the physical address of this interface, if the device driver supports this operation. CLASS is the hardware type name and ADDR is the physical address. Currently supported hardware types include ether (Ethernet), ax25 (AMPR AX.25), ARCnet, and netrom (AMPR NET/ROM)
multicast
	Set the multicast flag on the interface. Normally no display settings are needed, as the driver itself will set the correct flag ADDRESS
	IP address of the interface txqueuelen LENGTH
	Sets the length of the device's transmit queue. For slower devices with high latency (modem links, ISDN), it is useful to set this to a small value to prevent fast bulk transfers from interfering too much with interactive communications such as telnet.

ifconfig
eth0 Link encap:Ethernet HWaddr 00:16:3E:00:1E:51 
     inet addr:10.160.7.81 Bcast:10.160.15.255 Mask:255.255.240.0
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
     RX packets:61430830 errors:0 dropped:0 overruns:0 frame:0
     TX packets:88534 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:1000
     RX bytes:3607197869 (3.3 GiB) TX bytes:6115042 (5.8 MiB)

lo Link encap:Local Loopback 
     inet addr:127.0.0.1 Mask:255.0.0.0
     UP LOOPBACK RUNNING MTU:16436 Metric:1
     RX packets:56103 errors:0 dropped:0 overruns:0 frame:0
     TX packets:56103 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:0
     RX bytes:5079451 (4.8 MiB) TX bytes:5079451 (4.8 MiB)

ifconfig -a

ifconfig eth0

# Start the network card ifconfig eth0 up
# Shut down the network card ifconfig eth0 down

ifconfig eth0 down
ifconfig eth0 hw ether 00:AA:BB:CC:DD:EE
ifconfig eth0 up

# Configure an IP address for the eth0 network card ifconfig eth0 192.168.1.56

# Configure an IP address and subnet mask for the eth0 network card ifconfig eth0 192.168.1.56 netmask 255.255.255.0 

# Configure an IP address for the eth0 network card, plus the subnet mask and broadcast address ifconfig eth0 192.168.1.56 netmask 255.255.255.0 broadcast 192.168.1.255

# Enable the arp protocol for network card eth0 ifconfig eth0 arp
# Disable the arp protocol of network card eth0 ifconfig eth0 -arp

# Set the maximum packet size that can pass to 1500 bytes
ifconfig eth0 mtu 1500