Linux Network configuration

First, view 1.ip A//Simply view the network card IP information for the current host

1: lo（本地回环网卡）: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00    inet 127.0.0.1/8 scope host lo    inet6 ::1/128 scope host        valid_lft forever preferred_lft forever2: eth0（eth代表Ethernet、0表示第一块网卡）: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP（网卡工作正常，DOWN代表网卡未启用或未配置IP，UNKNOWN代表网卡异常或网线问题、IP地址配置错误） qlen 1000    link/ether 00:0c:29:77:21:e6（网卡的MAC地址） brd ff:ff:ff:ff:ff:ff（网卡的MAC广播地址）    inet 192.168.10.118/24（网卡的IP地址和子网掩码） brd 192.168.10.255（当前IP的广播地址） scope global eth0    inet6 fe80::20c:29ff:fe77:21e6/64（网卡的IPv6地址） scope link        valid_lft forever preferred_lft forever

2.ifconfig//Detailed view of network card IP information for the current host

 eth0 Link encap:ethernet HWaddr 00:0c:29:77:21:e6 (the MAC address of the network card) inet addr:192.168.10.118 (IP address of the network card) Bcas T:192.168.10.255 (the broadcast address of the network card) mask:255.255.255.0 (subnet mask of the network card) Inet6 ADDR:FE80::20C:29FF:FE77:21E6/64 (the IPV6 address of the network card) scope:l Ink up Broadcast RUNNING multicast mtu:1500 metric:1 RX packets:27592 errors:0 dropped:0 overruns:0 fr ame:0 (number of packets sent, multiple sent) TX packets:2250 errors:0 dropped:0 overruns:0 carrier:0 (number of packets received, less received) collisions:0 T xqueuelen:1000 RX bytes:18178026 (17.3 MiB) (total size of sending packets) TX bytes:265125 (258.9 KiB) (total size of received packets) Lo (local loopback nic) 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:65536 metric:1 RX packets:28 errors:0 dropped:0 overruns:0 frame:0 TX packets:28 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2240 (2.1 KiB) TX bytes:2240 (2.1 KiB) 

3.ip r//view routing information (default behavior defaults gateway address)

192.168.10.0/24 dev eth0  proto kernel  scope link  src 192.168.10.118 169.254.0.0/16 dev eth0  scope link  metric 1002 default via 192.168.10.1 dev eth0  //eth0网卡的网关地址为192.168.10.1

4.route-n//View routing information (verbose)

Kernel IP routing tableDestination     Gateway         Genmask         Flags Metric Ref    Use Iface（目标网段）   （网关地址） （目标网段子网掩码）（路由状态U代表UP、G代表Gateway、H代表Host）   （出口网卡）192.168.10.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth00.0.0.0         192.168.10.1    0.0.0.0         UG    0      0        0 eth0

5.cat/etc/resolv.conf//View DNS information

nameserver 192.168.3.5

6.hostname//view current host name (Identity host role) II. configuration 1. Temporary configuration (effective immediately, no restart required.) Lost after reboot) IP address

（1）ip a add [IP地址/子网掩码] dev 网卡设备名称    //给指定网卡新增临时IP地址

Cases:
[[Email protected] ~]# IP a add 192.168.10.223/24 dev eth0//Configure temporary IP address for eth0 NIC

（2）ip a del [IP地址/子网掩码] dev 网卡设备     //临时删除指定网卡的指定IP地址

Cases:
[[Email protected] ~]# ip a del 192.168.10.233/24 dev eth0//temporarily delete eth0 address of network card

（3）ifconfig 网卡设备 [IP地址/子网掩码]    //替换指定网卡IP地址

Cases:
[[email protected] ~]# ifconfig eth0 192.168.10.233/24//Replace the NIC's original IP address

Gateway Address

（4）route add default gw [网关地址]  dev [网卡设备名称]  //为指定网卡临时设置网关地址

Cases:
[[email protected] ~]# route add default GW 192.168.10.1 dev eth0//set eth0 NIC Gateway to 192.168.10.1

（5）route del default gw [网关地址] dev [网卡设备]    //临时删除指定网卡的默认地址

Cases:
[[email protected] ~]# route del default GW 192.168.10.1 dev eth0//Temporary delete eth0 NIC gateway address

DNS Address

（6）vim /etc/resolv.conf     //配置当前主机DNS服务器地址nameserver [DNS地址]

Note: General nameserver configuration Two, the system reads from the top down. Switch to the next DNS server only if the previous one does not work.

Host Name

（7）hostname 主机名 && bash      //临时设置主机名

Cases:
[[email protected] ~]# hostname www.hiahia.org && bash//temporarily set current host name www.hiahia.org

2. Permanent configuration (takes effect after reboot, still exists after reboot) IP address

（1）vim /etc/sysconfig/network-scripts/ifcfg-eth0   //编辑网卡配置文件DEVICE=eth0  //网卡设备TYPE=Ethernet  //网卡类型ONBOOT=yes  //开机自启NM_CONTROLLED=no  //禁用networkmanagerBOOTPROTO=static  //网卡地址为静态IPIPADDR=192.168.10.123  //网卡IPNETMASK=255.255.255.0  //网卡子网掩码GATEWAY=192.168.10.1  //网卡网关DNS1=192.168.3.5  //网卡首选DNSDNS2=114.114.114.114  //网卡备用DNS

（2）reboot | service network restart | /etc/init.d/network restart  //重启或重启服务生效

Host Name

（1）vim /etc/sysconfig/network  //修改当前系统主机名配置文件NETWORKING=yesHOSTNAME=www.hiahia.org  //当前系统的主机名

（2）reboot   //只能重启生效

Linux Network configuration