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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
[root@localhost ~]# cd /etc/sysconfig/network-scripts
[root@localhost 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
[root@localhost 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
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 192.168.133.133/24 brd 192.168.133.255 scope global dynamic eno16777736
valid_lft 1252sec preferred_lft 1252sec
inet6 fe80::20c:29ff:fec9:9b0b/64 scope link
valid_lft forever preferred_lft forever
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。
[root@localhost ~]# 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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原文地址：http://www.cnblogs.com/my-jin/p/5242217.html
