Linux ifconfig command

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Linux ifconfig command is used to display or set network devices.

ifconfig can set the status of the network device or display the current settings.

Syntax

ifconfig [Network Device][down up -allmulti -arp -promisc][add<address>][del<address>][<hw<Network Device Type><Hardware Address>][io_addr<I/O address>][irq<IRQ address>][media<Network Media Type>][mem_start<Memory Address>][metric<Number>][mtu<Bytes>][netmask<Subnet Mask>][tunnel<address>][-broadcast<address>][-pointopoint<address>][IP address]

Parameter Description:

• add<address> Set the IPv of the network device.6IP address.
• del<address> Delete the IPv of the network device.6IP address.
• down Close the specified network device.
• <hw<Network Device Type><Hardware Address> Set the type and hardware address of the network device.
• io_addr<I/O address> Set the I/O address.
• irq<IRQ address> Set the IRQ of the network device.
• media<network medium type> Set the medium type of the network device.
• mem_start<memory address> Set the starting address occupied by the network device in the main memory.
• metric<number> Specify the number to be added when calculating the number of packet transmissions.
• mtu<bytes> Set the MTU of the network device.
• netmask<subnet mask> Set the subnet mask of the network device.
• tunnel<address> Establish IPv4and IPv6Tunnel communication address between.
• up Start the specified network device.
• -broadcast<address> Treat the packets to be sent to the specified address as broadcast packets.
• -pointopoint<address> Establish a direct connection with the network device at the specified address, this mode has confidentiality features.
• -promisc Turn on or off the promiscuous mode of the specified network device.
• [IP Address] Specify the IP address of the network device.
• [Network Device] Specify the name of the network device.

Online example

Display network device information

# ifconfig        
eth0   Link encap:Ethernet HWaddr 00:50:56:0A:0B:0C 
     inet addr:192.168.0.3 Bcast:192.168.0.255 Mask:255.255.255.0
     inet6 addr: fe80::250:56ff:fe0a:b0c/64 Scope:Link
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
     RX packets:172220 errors:0 dropped:0 overruns:0 frame:0
     TX packets:132379 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:1000 
     RX bytes:87101880 (83.0 MiB) TX bytes:41576123 (39.6 MiB)
     Interrupt:185 Base address:0x2024 
lo    Link encap:Local Loopback 
     inet addr:127.0.0.1 Mask:255.0.0.0
     inet6 addr: ::1/128 Scope:Host
     UP LOOPBACK RUNNING MTU:16436 Metric:1
     RX packets:2022 errors:0 dropped:0 overruns:0 frame:0
     TX packets:2022 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:0 
     RX bytes:2459063 (2.3 MiB) TX bytes:2459063 (2.3 MiB)

Start and stop specified network card

# ifconfig eth0 down
# ifconfig eth0 up

Configure and delete IPv for network card6Address

# ifconfig eth0 add 33ffe:3240:800:1005::2/ 64 //Set IPv for network card6Address
# ifconfig eth0 del 33ffe:3240:800:1005::2/ 64 //Delete IPv for network card6Address

Modify MAC address using ifconfig

# ifconfig eth0 down //Close network card
# ifconfig eth0 hw ether 00:AA:BB:CC:DD:EE //Modify MAC Address
# ifconfig eth0 up //Start network card
# ifconfig eth1 hw ether 00:1D:1C:1D:1E //Close network card and modify MAC address 
# ifconfig eth1 up //Start network card

Configure IP Address

# ifconfig eth0 192.168.1.56 
//Configure IP address for eth0 network card
# ifconfig eth0 192.168.1.56 netmask 255.255.255.0 
// Configure IP address for eth0 network card, and add subnet mask
# ifconfig eth0 192.168.1.56 netmask 255.255.255.0 broadcast 192.168.1.255
// Configure IP address for eth0 network card, add subnet mask, and add a broadcast address

Enable and Disable ARP Protocol

# ifconfig eth0 arp  //Open
# ifconfig eth0 -arp  //Close

Set the Maximum Transmission Unit

# ifconfig eth0 mtu 1500 
//Set the maximum packet size that can be passed through 1500 bytes

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