Linux Network Configuration Command (i)--ifconfig

Linux Network configuration commands (i)--ifconfig ifconfig

View and configure network card information. Deprecated, using IP commands is recommended

Format:

Ifconfig [interface] To view specified NIC information, do not specify

Ifconfig interface [Aftype] options |   　　　　　　Address ... Setting the specified NIC information

Options

Interface NIC Name

Up activates the NIC

Down network card

[-]arp allows/disables the use of the ARP protocol

[-]promisc allows/disables promiscuous mode, and if allowed, the network card will receive all packets packet

Example

1. viewing network card information

IFCONIFG # View all network cards in use

Ifconfig–a # View all network cards

Ifconfig eth0 # View information for eth0 NIC

2. Setting Network card information

Ifconfig eth0 172.16.0.50/24 Up # Sets the IP and subnet mask of the NIC Eth0 and immediately opens

Ifconfig eth1 168.10.0.6 netmask 255.255.0.0 #设置网卡eth1的信息

Netstate

View information such as network connections, routing tables, network card data, spoofing connections, and multicast members

--route,-R View routing information

-T,--tcp view connection information related to TCP protocol

-U,--UDP

-L,--listen-ing view connection information in the listening state

-A,--all view all connection information

-N Displays IP and port information in numeric format

Example

View routing table information

Netstat-rn

View the network card bundle and accept packet data

[[Email protected] ~] #netstat-I

Kernel Interface Table

Iface MTU Met rx-ok rx-err rx-drp rx-ovr tx-ok tx-err tx-drp TX-OVR FLG

Eth0 0 294166 0 0 0 5889 0 0 0 Bmru

Eth1 0 646 0 0 0 1165 0 0 0 Bmru

Lo 65536 0 202 0 0 0 202 0 0 0 LRU

View TCP-related connections

Netstat–tan

Viewing UDP-related connections

Netstat–uan

To view a TCP connection in the listening state

Netstat-tnl

Route

View, set the routing table. This command is obsolete and it is recommended to use IP route

Format

Route [-cfvnee]

Route Add [-net |-host] target[netmask NM] [GW GW] # Add routing Records

Route del [-net |-host] TARGET [GW GW] [netmask Nm] [[Dev] If] # Delete route record

Options

-net represents network routing

-host indicates host routing

Target refers to a specific IP

Netmask refers to the subnet mask

GW Gateway

Dev refers to a specific NIC

Example

View the routing table

Route-rn

Add a route to the destination network address 11.11.0.0/16, via the gateway 172.16.0.1

Route add-net 11.11.0.0/16 GW 172.16.0.1

Set default gateway to 172.16.0.1

Route add–net 0.0.0.0 netmask 0.0.0.0 GW 172.16.0.1

Delete previous route record

Route Del-net 11.11.0.0/16

Linux Network Configuration Command (i)--ifconfig