解决虚拟机不能上网ifconfig只显示127.0.0.1的问题

如果你在看了其他解决虚拟机不能上网的方法之后还是不行，或许可以试试下面的方法。

我的虚拟机网络设置为桥接模式，输入ifconfig只显示127.0.0.1，不能连上外网。

xxx@ubuntu:~$ ifconfig
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  (本地环回)
        RX packets 4749  bytes 287841 (287.8 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4749  bytes 287841 (287.8 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

先切换为root用户

xxx@ubuntu:~$ sudo -i
[sudo] xxx 的密码： 
root@ubuntu:~#

再输入dhclient -v

root@ubuntu:~# dhclient -v
Internet Systems Consortium DHCP Client 4.3.5
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/ens33/00:0c:29:3b:83:0b
Sending on   LPF/ens33/00:0c:29:3b:83:0b
Sending on   Socket/fallback
DHCPDISCOVER on ens33 to 255.255.255.255 port 67 interval 3 (xid=0x125c9b7b)
DHCPREQUEST of 10.203.2.196 on ens33 to 255.255.255.255 port 67 (xid=0x7b9b5c12)
DHCPOFFER of 10.203.2.196 from 10.203.2.193
DHCPACK of 10.203.2.196 from 10.203.2.193
bound to 10.203.2.196 -- renewal in 1729 seconds.

再输入ifconfig就可以看到多了一个ip地址

root@ubuntu:~# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.203.2.196  netmask 255.255.255.224  broadcast 10.203.2.223
        inet6 2001:da8:215:c316:20c:29ff:fe3b:830b  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::20c:29ff:fe3b:830b  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:3b:83:0b  txqueuelen 1000  (以太网)
        RX packets 8  bytes 1251 (1.2 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 54  bytes 8642 (8.6 KB)
        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  (本地环回)
        RX packets 4942  bytes 299699 (299.6 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4942  bytes 299699 (299.6 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

这样就可以正常上网啦，记得输入exit回到登录者用户哟