Remote Control Is Not So Easy (Under CS Network)...
I've updated the firmware of the linksys router. Now I can redirect the ports like 22 to the blocked ports like 5800. If the CS lab didn't block so much ports, I don't have to do SO much things... =__=
Hope that I can remote control my server using the PC at office in this way.
P.S. I've tested http://minghong.no-ip.com:5800 at one of the terminals at floor 4, and it works! So I'm very pretty sure that the CS lab had blocked the port 5800 and 5900.