Problem located about my latency problem.
My Internet IP on the show box: A
The Internet IP of another show users in NW (same building): B
IP of show gateway in NW (dx2nw-g3): C
IP of my lab computer: D
Latency between A and B: over 1000ms
Latency between A and C : over 1000ms
Latency between A and D : over 1000ms
Latency between D and C : less than 10ms
Latency between D and B : less than 20ms
Latency between D and A : over 1000ms
It is pretty clear that the problem is about my show box. Since I have already diagnosed the problem for your guys, can you just send sombody to bring me a new show box? I've been suffered enough limited access.