~$ sudo nmcli dev show
   [sudo] password for carl:
   Usage: nmcli device { COMMAND | help }
        COMMAND := { status | list | disconnect | wifi }

    status
     list [iface <iface>]
     disconnect iface <iface> [--nowait] [--timeout <timeout>]
     wifi [list [iface <iface>] [bssid <BSSID>]]
     wifi connect <(B)SSID> [password <password>] [wep-key-type key|phrase] [iface <iface>] [bssid <BSSID>] [name <name>]
               [--private] [--nowait] [--timeout <timeout>]

错误：'dev' 命令 'show' 无效。

~$ ping -c 2 114.114.114.114
PING 114.114.114.114 (114.114.114.114) 56(84) bytes of data.

--- 114.114.114.114 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1008ms


~$ ping -c 2 mirrors.163.com
   ping: unknown host mirrors.163.com

~$ sudo dhclient -v eth0
Internet Systems Consortium DHCP Client 4.2.4
Copyright 2004-2012 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth0/34:17:eb:5f:a5:c9
Sending on   LPF/eth0/34:17:eb:5f:a5:c9
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0xd0acaa69)
DHCPREQUEST of 192.168.3.104 on eth0 to 255.255.255.255 port 67 (xid=0x69aaacd0)
DHCPOFFER of 192.168.3.104 from 192.168.3.1
DHCPACK of 192.168.3.104 from 192.168.3.1
RTNETLINK answers: File exists
bound to 192.168.3.104 -- renewal in 3214 seconds.



~$ sudo ifconfig -a
eth0      Link encap:以太网  硬件地址 34:17:eb:5f:a5:c9 
          inet 地址:192.168.3.104  广播:192.168.3.255  掩码:255.255.255.0
          inet6 地址: fe80::3617:ebff:fe5f:a5c9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  跃点数:1
          接收数据包:4270 错误:0 丢弃:10 过载:0 帧数:0
          发送数据包:1992 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:1000
          接收字节:343646 (343.6 KB)  发送字节:189720 (189.7 KB)

lo        Link encap:本地环回 
          inet 地址:127.0.0.1  掩码:255.0.0.0
          inet6 地址: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  跃点数:1
          接收数据包:4458 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:4458 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:0
          接收字节:369262 (369.2 KB)  发送字节:369262 (369.2 KB)

wlan0     Link encap:以太网  硬件地址 30:3a:64:58:35:e0 
          inet6 地址: fe80::323a:64ff:fe58:35e0/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  跃点数:1
          接收数据包:13267 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:14937 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:1000
          接收字节:9635273 (9.6 MB)  发送字节:2123471 (2.1 MB)


~$ sudo iwconfig
eth0      no wireless extensions.

wlan0     IEEE 802.11abgn  ESSID:off/any 
          Mode:Managed  Access Point: Not-Associated   Tx-Power=22 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:on
         
lo        no wireless extensions.



~$ sudo route -nv
内核 IP 路由表
目标            网关            子网掩码        标志  跃点   引用  使用 接口
0.0.0.0         192.168.3.1     0.0.0.0         UG    0      0        0 eth0
192.168.3.0     0.0.0.0         255.255.255.0   U     1      0        0 eth0


~$ sudo lshw -C network
  *-network               
       description: Ethernet interface
       product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: 07
       serial: 34:17:eb:5f:a5:c9
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8106e-1_0.0.1 06/29/12 ip=192.168.3.104 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       resources: irq:44 ioport:4000(size=256) memory:b0b00000-b0b00fff memory:b0800000-b0803fff
  *-network
       description: Wireless interface
       product: Wireless 3160
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlan0
       version: 83
       serial: 30:3a:64:58:35:e0
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=3.19.0-25-generic firmware=25.17.12.0 latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
       resources: irq:48 memory:b0a00000-b0a01fff



~$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 202.96.134.133
nameserver 202.96.128.68
nameserver 127.0.1.1

/etc/resolv.conf  //内容修改不了啊