On Thu, Apr 14, 2011 at 10:28 AM, Vlado Peshov <[email protected]> wrote:

> I am using this on debian lenny and squeeze(not with those ports of course
> :) ). Rules line is like this:
>
> SSHKnock:info net $FW tcp 22,1111,3333,2222
>

Here is also the article:

http://www.esdebian.org/wiki/port-knocking

where I took the idea and netfilter/iptables implementation for the code I
pasted here. It is on Spanish, but I used google translate. Normally I also
used the main documentation site:

http://www.shorewall.net/PortKnocking.html

Regards,
Vlado
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