= 2011-10-30 =

== SSH port forward ==

 * <情境> 有些網路環境綁得很死，像是會擋 VNC (5800~59**) 連線埠，這時候就只能用 SSH 穿牆術了～
 * <解法> 語法：ssh -L 5902:localhost:5901 user@A.B.C.D
{{{
}}}
{{{
#!txt
  +-------------------+                      +-------------------------+
  |                   |          Firewall    |                         |
  |         vncviewer +-------------XX       + 0.0.0.0:5901 vnc server |
  |                   |             ||       |                         |
  |        ssh client +-------------OO-------+ 0.0.0.0:22   ssh server |
  |                   |             ||       |                         |
  +-------------------+                      +-------------------------+
       My Notebook                                   Remote Server
        localhost                               IP address : A.B.C.D

                                    |||
         on localhost               |||
     Run following command          |||
  'ssh -L 5902:localhost:5901       |||
        user@A.B.C.D'              VVVVV
                                    VVV
                                     V

  +-------------------+                      +-------------------------+
  |                   |          Firewall    |                         |
  |  + 127.0.0.1:5902 +===+         ||   +===+ 0.0.0.0:5901 vnc server |
  |  |                |   |         ||   |   |                         |
  |  |     ssh client +---+---------OO---+---+ 0.0.0.0:22   ssh server |
  |  |                |             ||       |                         |
  |  +----- vncviewer |             ||       |                         |
  +-------------------+                      +-------------------------+
       My Notebook                                   Remote Server
        localhost                               IP address : A.B.C.D
}}}