参考：
https://blog.csdn.net/zgf19930504/article/details/51955067
原文链接：https://www.f2er.com/ubuntu/349614.html1 先使用ifconfig查看网卡名称
$ ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.3.39 netmask 255.255.255.0 broadcast 192.168.3.255
inet6 fe80::279b:4479:ea46:ae99 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:ee:4b:bc txqueuelen 1000 (Ethernet)
RX packets 44187 bytes 21079541 (21.0 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 29266 bytes 9993375 (9.9 MB)
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 810 bytes 71857 (71.8 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 810 bytes 71857 (71.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
我的网卡名称为ens33.
2 修改文件添加网卡
修改文件/etc/network/interfaces，添加网卡，网卡名为：原来网卡（ens33）:1，可以创建多个，修改:后面的数字即可。
$ sudo vim /etc/network/interfaces原始内容为：
# interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback改为:
# interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback auto ens33:1 iface ens33:1 inet static address 123.1.0.123 netmask 255.255.255.0
3 使用ifconfig查看结果
$ sudo /etc/init.d/networking restart
$ ifconfig
ens33: flags=4163<UP,MULTICAST> mtu 1500
inet 192.168.3.39 netmask 255.255.255.0 broadcast 192.168.3.255
inet6 fe80::279b:4479:ea46:ae99 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:ee:4b:bc txqueuelen 1000 (Ethernet)
RX packets 44442 bytes 21113893 (21.1 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 29484 bytes 10015338 (10.0 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33:1: flags=4163<UP,MULTICAST> mtu 1500
inet 123.1.0.123 netmask 255.255.255.0 broadcast 123.1.0.255
ether 00:0c:29:ee:4b:bc txqueuelen 1000 (Ethernet)
lo: flags=73<UP,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 870 bytes 76225 (76.2 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 870 bytes 76225 (76.2 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
4 访问123.1.0.123，查看是否可以访问
先用Ubuntu访问http://123.1.0.123，确定是可以访问到内容的
Android设备未连接VPN的情况下访问http://123.1.0.123，访问不通
Android设备连接VPN后访问http://123.1.0.123，可以成功访问
PS：在这里我是先安装了apache（sudo apt-get install apache2 apache2-doc），访问http://123.1.0.123和访问http://127.0.0.1的效果相同。
