day30-有关网络的一些命令

ifconfig：查看设置IP

查看网卡设备IP

[root@oldboy ~]$ ifconfig      <===查看所有网卡的IP
eth0: flags=4163  mtu 1500
        inet 10.0.0.201  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::ee8d:f3d3:c194:40b4  prefixlen 64  scopeid 0x20
        ether 00:0c:29:be:01:b3  txqueuelen 1000  (Ethernet)
        RX packets 31  bytes 4411 (4.3 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 50  bytes 6401 (6.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        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

[root@oldboy ~]$ ifconfig eth0      <===查看指定网卡的IP
eth0: flags=4163  mtu 1500
        inet 10.0.0.201  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::ee8d:f3d3:c194:40b4  prefixlen 64  scopeid 0x20
        ether 00:0c:29:be:01:b3  txqueuelen 1000  (Ethernet)
        RX packets 51  bytes 6071 (5.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 62  bytes 8571 (8.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

关闭网卡

[root@oldboy ~]$ ifconfig down eth0

开启网卡

[root@oldboy ~]$ ifconfig eth0 up
配置ip地址
[root@oldboy ~]$ ifconfig eth0 10.0.0.201  
[root@oldboy ~]$ ifconfig eth0      <===查看IP是否修改

配置ip地址和子网掩码

[root@oldboy ~]$ ifconfig eth0 10.0.0.201 netmask 255.255.255.0
[root@oldboy ~]$ ifconfig eth0      <===查看IP和子网掩码是否修改

删除IP地址

[root@oldboy ~]$ ifconfig eth0 del 192.168.1.100

ip：查看和设置网络和IP

查看IP地址

[root@oldboy ~]$ ip a
2: eth0:  mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:be:01:b3 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.201/24 brd 10.0.0.255 scope global noprefixroute eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::ee8d:f3d3:c194:40b4/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

ping：检查网络是否通畅

[root@oldboy ~]$  ping baidu.com  
PING baidu.com (220.181.57.216) 56(84) bytes of data.
64 bytes from 220.181.57.216 (220.181.57.216): icmp_seq=1 ttl=128 time=18.4 ms

traceroute：查看到达主机的网络路由信息

参数
-d不做反向解析

route：查看设置网关、路由

参数：
-n 查看路由信息

telnet：检测远程端口是否通畅