linux 设置固定ip和dns

1. centos
2. ubuntu

1. centos

1.1 ifconfig 查看网卡名称

# ifconfig

ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.137.128  netmask 255.255.255.0  broadcast 192.168.137.255

        inet6 fe80::91b0:54db:c4f3:d9a9  prefixlen 64  scopeid 0x20<link>

        ether 00:0c:29:67:b4:aa  txqueuelen 1000  (Ethernet)

        RX packets 150  bytes 24587 (24.0 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 162  bytes 21607 (21.1 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1000  (Local Loopback)

        RX packets 738  bytes 1245656 (1.1 MiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 738  bytes 1245656 (1.1 MiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

由上面信息可知，系统目前是使用网卡ens33访问Internet的，我们要设置的就是ens33的IP地址。

1.2 设置固定ip和dns

# vim /etc/sysconfig/network-scripts/ifcfg-ens33

TYPE=Ethernet

PROXY_METHOD=none

BROWSER_ONLY=no

BOOTPROTO=static  #静态IP

DEFROUTE=yes

IPV4_FAILURE_FATAL=no

IPV6INIT=yes

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_FAILURE_FATAL=no

IPV6_ADDR_GEN_MODE=stable-privacy

NAME=ens33

UUID=1d993961-7171-4a50-a17b-089cc70f96e4

DEVICE=ens33

ONBOOT=yes  #开机启动

IPV6_PRIVACY=no

CONNECTION_METERED=no

IPADDR=172.16.31.186 #本机地址

NETMASK=255.255.0.0 #子网掩码

GATEWAY=172.16.0.1 #默认网关

DNS1=172.16.0.10

DNS2=8.8.8.8

注意，后有备注的部分，按实际要求更改。

1.3 重启网络

# service network restart

2. ubuntu

2.1 ifconfig 查看网卡名称

# ifconfig

eno1      Link encap:Ethernet  HWaddr dc:f4:01:e7:11:88

          inet addr:172.16.36.212  Bcast:172.16.255.255  Mask:255.255.0.0

          inet6 addr: fe80::def4:1ff:fee7:1188/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:13838092 errors:0 dropped:23139 overruns:0 frame:0

          TX packets:613652 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:3479806143 (3.4 GB)  TX bytes:65456575 (65.4 MB)

          Interrupt:56 

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:65536  Metric:1

          RX packets:266991 errors:0 dropped:0 overruns:0 frame:0

          TX packets:266991 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1

          RX bytes:971472461 (971.4 MB)  TX bytes:971472461 (971.4 MB)

由上面信息可知，系统目前是使用网卡ens33访问Internet的，我们要设置的就是eno1的IP地址。

2.2 设置固定ip和dns

# sudo vim /etc/network/interfaces

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface

auto lo

iface lo inet loopback

auto eno1 # 设置网卡自启动

iface eno1 inet static  # 设置使用固定ip

address 172.16.36.212 # 设置ip

netmask 255.255.0.0 # 设置子网掩码

gateway 172.16.0.1  # 设置网关

dns-nameserver 172.16.0.10  # 设置DNS

dns-nameserver 8.8.8.8

2.3 重启网络

# sudo /etc/init.d/networking restart

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