前言

• linux （CentOS 7.7）

命令1

shell> ip address

執行結果：

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000link/ether 00:16:3e:02:7b:f2 brd ff:ff:ff:ff:ff:ffinet 172.21.156.57/20 brd 172.21.159.255 scope global dynamic eth0valid_lft 315225364sec preferred_lft 315225364sec 3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000link/ether 52:54:00:e7:b2:a9 brd ff:ff:ff:ff:ff:ffinet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0valid_lft forever preferred_lft forever 4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000link/ether 52:54:00:e7:b2:a9 brd ff:ff:ff:ff:ff:ff

命令2

shell> ifconfig

執行結果：

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet 172.21.156.57 netmask 255.255.240.0 broadcast 172.21.159.255ether 00:16:3e:02:7b:f2 txqueuelen 1000 (Ethernet)RX packets 170963958 bytes 159713167507 (148.7 GiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 73149117 bytes 23172228834 (21.5 GiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536inet 127.0.0.1 netmask 255.0.0.0loop txqueuelen 1000 (Local Loopback)RX packets 8212 bytes 414073 (404.3 KiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 8212 bytes 414073 (404.3 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255ether 52:54:00:e7:b2:a9 txqueuelen 1000 (Ethernet)RX packets 0 bytes 0 (0.0 B)RX errors 0 dropped 0 overruns 0 frame 0TX packets 0 bytes 0 (0.0 B)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

優化命令

ifconfig|grep netmask|awk '{print $2}'

執行結果：

172.21.156.57 127.0.0.1 192.168.122.1

總結

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