1、PC上启动代理，比如nginx

下载nginx：http://nginx.org/en/download.html
修改配置文件，在conf下：

http {include       mime.types;default_type  application/octet-stream;sendfile        on;keepalive_timeout  65;server {listen       888;server_name  localhost;location / {    proxy_pass http://archive.ubuntu.com;        proxy_set_header X-Real-IP $remote_addr;proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;}}

2、启动ssh

 ssh -R localhost:xxx1:localhost:xxx2 username@服务器IP

参数分别是：服务器端口:PC主机:PC端口

连上后设置代理：

export {http,https}_proxy='localhost:xxx1'

这时总体拓扑为：