Linux网络相关命令

1、ping命令

ping命令采用的协议是ICMP协议，例如ping www.baidu.com 检测是否可以访问百度；

[xuanmiao@192 ~]$ ping www.baidu.com
PING www.a.shifen.com (36.152.44.95) 56(84) bytes of data.
64 bytes from 36.152.44.95 (36.152.44.95): icmp_seq=2 ttl=128 time=24.9 ms
64 bytes from 36.152.44.95 (36.152.44.95): icmp_seq=4 ttl=128 time=19.2 ms
64 bytes from 36.152.44.95 (36.152.44.95): icmp_seq=5 ttl=128 time=21.0 ms
^C
--- www.a.shifen.com ping statistics ---
15 packets transmitted, 13 received, 13% packet loss, time 15115ms
rtt min/avg/max/mdev = 14.623/22.335/32.250/4.823 ms

 ping命令指定接收包的次数(例如接收两次)：ping -c  2 www.baidu.com

[xuanmiao@192 ~]$ ping -c 2 www.baidu.com
PING www.a.shifen.com (36.152.44.95) 56(84) bytes of data.
64 bytes from 36.152.44.95 (36.152.44.95): icmp_seq=1 ttl=128 time=18.1 ms
64 bytes from 36.152.44.95 (36.152.44.95): icmp_seq=2 ttl=128 time=26.3 ms

--- www.a.shifen.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1004ms
rtt min/avg/max/mdev = 18.199/22.282/26.366/4.086 ms

2、ifconfig命令

ifconfig查看网卡信息：

[xuanmiao@192 ~]$ ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.20.131  netmask 255.255.255.0  broadcast 192.168.20.255
        inet6 fe80::ea6c:36c2:62c6:7307  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:db:5e:d7  txqueuelen 1000  (Ethernet)
        RX packets 221599  bytes 322574694 (307.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 25051  bytes 1529699 (1.4 MiB)
        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 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:59:99:ab  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

 这里的ens33表示的是网卡，lo是本地环回接口，virbro是虚拟网络接口；看一下这个帖子：eth0，lo，virbr0分别是什么-云社区-华为云 (huaweicloud.com)