Thanks Harry

I tried what you said. I pinged both 172.17.0.1 and 216.32.81.146. There is no reply at all.
Even I truncate the process by Ctrl+c, it says 100% net loss.
But when I ping 172.17.255.255, the response comes from 172.17.0.100 which is
my actual IP address. So the response time is zero.
Furthermore, when I look at my ROUTETECH, the light doesn't flash at all. I remember
it often does so, when I use internet.
In my ROUTETECH, I don't see any button or hook to change somethings, so I suspect
that I can't turn on or off something.
I tried to switch off the power of ROUTETECH to change the cycling power on a router.
( Hopefully, I guess this is the only thing to do so. )
No use.

I used netcardconfig and replying Yes, I get reply "eth0 Operation failed".
if I reply No to DHCP broadcasting, it asks bunch of IP addresses. I don't know it.

These are what I tried. Please inform me, if I have to supply other infos.

Regards
Bataa