How to stop an active network connection

[T o n g <mlist4suntong@yahoo.com>]

Hi, 

How can I stop an active network connection? e.g.,

 $ netstat 
 Active Internet connections (w/o servers)
 Proto Recv-Q Send-Q Local Address           Foreign Address         
State      
 tcp        0      0 192.168.0.100:ssh       ip-72-55-146-217.:35911 
ESTABLISHED

Because barbarians are pounding at my sshd gate again:

 . . .
 Dec  2 16:41:37 helios sshd[9201]: Invalid user chad from 72.55.146.217
 Dec  2 16:41:37 helios sshd[9201]: pam_unix(sshd:auth): check pass; user 
unknown
 Dec  2 16:41:37 helios sshd[9201]: pam_unix(sshd:auth): authentication 
failure; logname= uid=0 euid=0 tty=ssh ruser= 
rhost=ip-72-55-146-217.static.privatedns.com 
 Dec  2 16:41:39 helios sshd[9201]: Failed password for invalid user chad 
from 72.55.146.217 port 42328 ssh2
 . . .

I shut down my sshd daemon, but the network bandwidth did not drop. The
active connection went away in the netstat output, which is wrong, and 
iftop was able to reveal the still-live connection. 

Please help. 

thanks


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