Both James Youngman @gnu.org and Eric Pozharski @comp.os.linux.networking
explained the actual meaning of "icmp unreach port":
... these ICMP port-unreachable errors indicate that the remote systems are
trying to communicate with a network port you're not listening on.
... those hosts attempt to open port on yours address...; then, since you
(supposedly) don't have those services enabled on your host, yours kernel
REJECTs them (that's what "icmp unreach port" means).
Knowing this, I feel much relieved.
> First of all, these are very small numbers. This almost certainly is
> not a summary of what's using up all your bandwidth (if that's indeed
The explanation for this is that I didn't list all the traffic. There are
many and they do add up to all my bandwidth.
The actual reason, I think, is that I've used a Bittorrent client
before. But it was *hours* before -- didn't expect the Bittorrent clients
on other side were so persistent...
Thanks again to everybody!
Tong (remove underscore(s) to reply)
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