Network Management Command of linux

This article mainly introduces the basic commands of network viewing and configuration under linux: ifconfig, ip, route, and then introduces the configuration of DNS, hostname and other information.

1. Network interface type:

Lo: local loopback interface

Eth [0-9]: Ethernet interface

Pppx: point-to-point connection

two。 The ifconfig / / of the network IP address configuration command can view the specific active Nic information

When I drop the lo down, enable or disable the network card as follows / / ifconfig lo down/up

[root@lys ~] # ifconfig eno16777736 192.168.2.110 / / temporarily modify the network card ip. Restart is invalid.

3. Management commands of network services

Usage format:

/ etc/init.d/network {start | stop | restart | status} or service network {start | stop | restart | status}

4. How to keep ip permanently. At this point we are going to edit the file. Cd / etc/sysconfig/network-scripts/

The above are network configuration files, what we need to edit is ifcfg-eno16777736

Route of the configuration command:

Route: you can view the routing information on our system directly

Route-n: displays routing information in digital form

Add rout

Route add-host: add host rout

Route add-net: add network rout

Route add-net 0.0.0.0: add default rout

Format: route add-net | host DEST gw NEXTHOP

Delete a rout

Route del-host: delete host rout

Route del-net: delete network routes / / or route delete 192.168.2.112 gw 192.168.2.1

Ip of the configuration command:

1.ip addr show: look at the network information, and the information you see is similar to that of ip link show, which is relatively brief.

Ip addr add IP dev ethX: configure IP address (the Nic information configured by this command cannot be viewed by ifconfig and needs to be viewed by ip addr show)

[root@lys ~] # ip addr add 192.168.2.112 dev eno16777736 / / ip addr show command view

Ip addr add IP dev ethx label ethX:X: configure the child Ip and give it an alias.

The configuration file of DNS is / etc/resolve.conf by default. The resolution process of a domain name is / etc/hosts first, then / etc/resolve.conf.

Check the network connection: / /-number of ping packets

A simple introduction to network tools:

Nmap-sTU localhost simultaneously scans the local TCP/UDP port

Nmap-sP 192.168.1.0 Universe 24 (check how many hosts are in the area network through the ICMP package)