Linux networks: Common commands (i)

1.ifconfig can view the network card status of Linux

Ifconfig eth0 to view eth0 information

Set multiple IP addresses for a network card: Ifconfig eth0:0 192.168.1.12 255.255.255.0

Turn off and turn on the NIC Ifdown eth0 ifup eth0

Turn off all network cards using/etc/init.d/network restart

Set the network card to take effect permanently:

Method 1. In CentOS or Rhel (Rad hat) You can use the Setup tool if it is not installed yum-y instll Setup

Method 2. You can modify the configuration file directly/etc/sysconfig/network-script/ifcfg-eth0

2.netstat Querying network status

netstat [options] Of course netstat-rn-r lists the routing list, with the same functionality as the route command

-t lists TCP protocol Ports-U lists UDP protocol Port-N uses IP address and port number to display-l lists all network links in the Listening state Network service-A

1[Email protected] ~]# netstat-Tuln2 Active Internet connections (only servers)3Proto Recv-q send-Q Local Address Foreign address state4Tcp0      0 0.0.0.0:35086               0.0.0.0:*LISTEN5Tcp0      0 0.0.0.0:111                 0.0.0.0:*LISTEN6Tcp0      0 127.0.0.1:631               0.0.0.0:*LISTEN7Tcp0      0 127.0.0.1: -                0.0.0.0:*LISTEN8Tcp0      0 0.0.0.0:1992                0.0.0.0:*LISTEN9Tcp0      0:::111:::*LISTENTenTcp0      0:::58614:::*LISTEN OneTcp0      0::1:631:::*LISTEN ATcp0      0::1: -:::*LISTEN -Tcp0      0:::1992:::*LISTEN -Udp0      0 0.0.0.0:111                 0.0.0.0:* theUdp0      0 0.0.0.0:631                 0.0.0.0:* -Udp0      0 0.0.0.0:931                 0.0.0.0:* -Udp0      0 0.0.0.0:951                 0.0.0.0:* -Udp0      0 0.0.0.0:37596               0.0.0.0:* +Udp0      0:::111:::* -Udp0      0:::42503:::* +Udp0      0:::931:::*

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NETSTAT-RN Demo

1[Email protected] ~]# netstat-RN2 Kernel IP Routing table3 Destination Gateway genmask Flags MSS Window irtt Iface4 192.168.181.0   0.0.0.0         255.255.255.0U0 0          0eth05 169.254.0.0     0.0.0.0         255.255.0.0U0 0          0eth06 0.0.0.0         192.168.181.1   0.0.0.0Ug0 0          0Eth0

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3.route command to view the list of routes (you can view the gateway)

1[Email protected] ~]# route-N2 Kernel IP Routing table3 Destination Gateway genmask Flags Metric Ref use Iface4 192.168.181.0   0.0.0.0         255.255.255.0U0      0        0eth05 169.254.0.0     0.0.0.0         255.255.0.0U1002   0        0eth06 0.0.0.0         192.168.181.1   0.0.0.0Ug0      0        0Eth0

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4.nslookup Domain Name Resolution command

nslookup [host name or IP]

or run Nslookup directly after you enter the DNS server that server uses to view your current host

This command Windows DOS command line is also common because he is a network protocol command on some network devices is also common for example on Cisco routers

Linux networks: Common commands (i)