conntrack-tools 0.9.14 can not block the connection

[Richard Feng <rfeng@wurldtech.com>]

Hi,

I am using Linux 2.6.29. I have the problem for using 'conntrack' 
(version:0.9.14) to block the traffic.
Using the following command as example:
  conntrack -D -s 1.1.1.1 -d 2.2.2.2
After execution, it appears the connection info was deleted -
  conntrack -L | grep 1.1.1.1 -- shows the entry was deleted.

However, the connection is still active - is this the correct behaviour? 

From the documentation (from conntrack-tools.netfilter.org), somewhere it says 
that "have to set /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_be_liberal to 
zero".There is simply no 'netfilter' folder under my 
folder '/proc/sys/net/ipv4'. Is this the problem? How could I fix it?


Thanks,
Richard Feng