error while blocking this websites bittorrent & edonkey using iptables .

[saravanang86]

HI.,
when i was try to execute this command in my router device it will show error...

First execution :-

# iptables -I OUTPUT -p tcp --dport 80 -m string --string "bittorrent.com" -j DROP
iptables v1.4.0: Couldn't find match `string'

Try `iptables -h' or 'iptables --help' for more information.

Second Execution :-

# iptables -I OUTPUT -p tcp --dport 80 -m string --string "edonkey.com" -j DROP
iptables v1.4.0: Couldn't find match `string'

Try `iptables -h' or 'iptables --help' for more information.

so I Need to block this kind of websites ...kindly tell me what i have to rectify & change..
here i didnt execute this command...


Regards
Saravanan G

[HROAdmin26]

Man iptables

string

This modules matches a given string by using some pattern matching strategy. It requires a linux kernel >= 2.6.14.
--algo bm|kmp
Select the pattern matching strategy. (bm = Boyer-Moore, kmp = Knuth-Pratt-Morris)
--from offset
Set the offset from which it starts looking for any matching. If not passed, default is 0.
--to offset
Set the offset from which it starts looking for any matching. If not passed, default is the packet size.
--string pattern
Matches the given pattern. --hex-string pattern Matches the given pattern in hex notation.

A) Kernel >= 2.6.14

B) Support for "string" matching compiled into the version of iptables you're using.