Centos 7 网络配置

Posted 2020-06-18 My_Jin

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Centos 7开始使用ip命令替换了以前的ifconfig

ip [选项] 操作对象{link|addr|route...}

# ip link show # 显示网络接口信息
# ip link set eth0 upi # 开启网卡
# ip link set eth0 down # 关闭网卡
# ip link set eth0 promisc on # 开启网卡的混合模式
# ip link set eth0 promisc offi # 关闭网卡的混个模式
# ip link set eth0 txqueuelen 1200 # 设置网卡队列长度
# ip link set eth0 mtu 1400 # 设置网卡最大传输单元
# ip addr show # 显示网卡IP信息
# ip addr add 192.168.0.1/24 dev eth0 # 设置eth0网卡IP地址192.168.0.1
# ip addr del 192.168.0.1/24 dev eth0 # 删除eth0网卡IP地址

# ip route list # 查看路由信息
# ip route add 192.168.4.0/24 via 192.168.0.254 dev eth0 # 设置192.168.4.0网段的网关为192.168.0.254,数据走eth0接口
# ip route add default via 192.168.0.254 dev eth0 # 设置默认网关为192.168.0.254
# ip route del 192.168.4.0/24 # 删除192.168.4.0网段的网关
# ip route del default # 删除默认路由

开启自动获取

首先查看自己的网卡信息

ip addr show

1: lo: <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
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c9:9b:0b brd ff:ff:ff:ff:ff:ff

可查看到网卡名称为eno16777736

进入network-scripts

[[email protected] ~]# cd /etc/sysconfig/network-scripts
[[email protected] network-scripts]# ls
ifcfg-eno16777736 ifdown-eth   ifdown-isdn    ifdown-sit       ifup          ifup-ib    ifup-plip   ifup-routes    ifup-tunnel        network-functions-ipv6
ifcfg-lo           ifdown-ib    ifdown-post    ifdown-Team      ifup-aliases ifup-ippp ifup-plusb ifup-sit       ifup-wireless
ifdown             ifdown-ippp ifdown-ppp     ifdown-TeamPort ifup-bnep     ifup-ipv6 ifup-post   ifup-Team      init.ipv6-global
ifdown-bnep        ifdown-ipv6 ifdown-routes ifdown-tunnel    ifup-eth      ifup-isdn ifup-ppp    ifup-TeamPort network-functions
[[email protected] network-scripts]#

可以查看到我们相应网卡的配置文件为ifcfg-eno16777736

使用vi ifcfg-eno16777736

进入编辑

TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777736
UUID=5b96b479-11f3-4aec-b984-129de5721e7b
DEVICE=eno16777736
ONBOOT=no

将ONBOOT=no修改为ONBOOT=yes并保存退出重启

重启后再次使用ip addr show可查看到

我们网卡已经自动获取到ip了

手工设置IP地址：

TYPE=Ethernet
#BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777736
UUID=5b96b479-11f3-4aec-b984-129de5721e7b
DEVICE=eno16777736
ONBOOT=yes
IPADDR0=192.168.133.130
PREFIX0=24
GETWAY0=192.168.133.2
DNS1=192.68.133.2
DNS2=218.85.152.99

通过上面配置。我们为系统指定ip 子网掩码网关以及DNS地址。

[[email protected] ~]# ip addr show
1: lo: <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
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c9:9b:0b brd ff:ff:ff:ff:ff:ff
    inet 192.168.133.130/24 brd 192.168.133.255 scope global eno16777736
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fec9:9b0b/64 scope link
       valid_lft forever preferred_lft forever

习惯使用ifconfig的可以实现联网后通过yum install net-tools安装net-tools组件使用ifconfig。

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