Linux配置ip地址的两种方法

Linux配置ip地址的两种方法，实验环境为centos7.6

方法1：nmcli工具配置 (centos7以下版本不支持该方法)

第一步，通过nmcli connection查看网卡名称

[root@localhost ~]# nmcli connection  
NAME UUID TYPE DEVICE  
eth0 09be0948-faf1-43b6-a5a4-c19efab0bb48 ethernet eth0 

第二步，配置ip，网关，dns，并设置网卡开机自动启动，最后开启网卡

[root@localhost ~]# nmcli connection modify eth0 ipv4.addresses "192.168.1.201/24" 

说明：配置地址和掩码

[root@localhost ~]# nmcli connection modify eth0 ipv4.gateway "192.168.1.1" 

说明：配置网关

[root@localhost ~]# nmcli connection modify eth0 ipv4.dns "180.76.76.76" 

说明：配置dns

[root@localhost ~]# nmcli connection modify eth0 ipv4.method manual 

说明：地址获取的方法为手动配置而不是dhcp

[root@localhost ~]# nmcli connection modify eth0 autoconnect yes 

说明：开机自动打开网卡

[root@localhost ~]# nmcli connection up eth0 

说明：立即打开网卡

Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/4) 

第三步，查看结果(这里使用ip addr命令查看，较新版本Linux系统支持该命令)

[root@localhost ~]# ip addr 
 
 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 
inet 127.0.0.1/8 scope host lo 
valid_lft forever preferred_lft forever 
inet6 ::1/128 scope host 
valid_lft forever preferred_lft forever 
 
 
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 
link/ether 00:0c:29:84:23:62 brd ff:ff:ff:ff:ff:ff 
inet 192.168.1.201/24 brd 192.168.1.255 scope global noprefixroute eth0 
valid_lft forever preferred_lft forever 
inet6 fe80::b7ad:e2ed:832e:99a9/64 scope link noprefixroute 
valid_lft forever preferred_lft forever 

测试通信

[root@localhost ~]# ping www.baidu.com 
PING www.a.shifen.com (61.135.169.121) 56(84) bytes of data. 
64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=1 ttl=53 time=34.7 ms 
64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=2 ttl=53 time=27.9 ms 
64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=3 ttl=53 time=24.1 ms 
64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=4 ttl=53 time=25.2 ms 
64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=5 ttl=53 time=24.2 ms 
^C 
--- www.a.shifen.com ping statistics --- 
5 packets transmitted, 5 received, 0% packet loss, time 4005ms 
rtt min/avg/max/mdev = 24.177/27.277/34.718/3.970 ms 

方法2：通过vi编辑网卡配置文件(最新版rhel8或centos8不推荐该方法，老版本rhel6及以下推荐该方法)

第一步，通过vi或vim打开配置文件

[root@localhost ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0 

第二步，编辑相关的参数

TYPE=Ethernet 
PROXY_METHOD=none 
BROWSER_ONLY=no 
BOOTPROTO=none 
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=eth0 
UUID=09be0948-faf1-43b6-a5a4-c19efab0bb48 
DEVICE=eth0 
ONBOOT=yes 
IPADDR=192.168.1.202 
PREFIX=24 
GATEWAY=192.168.1.1 
DNS1=180.76.76.76 
PEERDNS=no 

vi的编辑方法是，输入字母i，进行编辑，编辑完成后，按esc，再按:wq 保存退出。如果不保存，则是:q!退出

第三步，重启网络服务

[root@localhost ~]# service network restart  
Restarting network (via systemctl): [ OK ] 

第四步，查看结果并测试通信(这里用ifconfig命令来查看，各种版本Linux均支持该命令)

[root@localhost ~]# ifconfig eth0 
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 
inet 192.168.1.202 netmask 255.255.255.0 broadcast 192.168.1.255 
inet6 fe80::b7ad:e2ed:832e:99a9 prefixlen 64 scopeid 0x20<link> 
ether 00:0c:29:84:23:62 txqueuelen 1000 (Ethernet) 
RX packets 1117 bytes 127303 (124.3 KiB) 
RX errors 0 dropped 0 overruns 0 frame 0 
TX packets 564 bytes 69559 (67.9 KiB) 
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0  
 
 
[root@localhost ~]# ping www.baidu.com 
PING www.a.shifen.com (61.135.169.125) 56(84) bytes of data. 
64 bytes from 61.135.169.125 (61.135.169.125): icmp_seq=1 ttl=53 time=28.2 ms 
64 bytes from 61.135.169.125 (61.135.169.125): icmp_seq=2 ttl=53 time=30.9 ms 
^C 
--- www.a.shifen.com ping statistics --- 
3 packets transmitted, 2 received, 33% packet loss, time 2003ms 
rtt min/avg/max/mdev = 28.228/29.590/30.953/1.373 ms 
[root@localhost ~]# 

 

配置地址的两种方法就介绍到这里。

但是查看地址时，我们并没有看到网关和dns，那么网关和dns怎么看呢，用以下两条命令即可

[root@localhost ~]# route -n 通过查看路由表来知道网关 
 
Kernel IP routing table 
Destination Gateway Genmask Flags Metric Ref Use Iface 
0.0.0.0 192.168.1.1 0.0.0.0 UG 100 0 0 eth0 
[root@localhost ~]# cat /etc/resolv.conf 通过查看rsolv.conf文件来查看dns 
# Generated by NetworkManager 
nameserver 180.76.76.76