Try the rules below, simple and clean:

EXT_IF='eth1'    # the interface connected to Internet
SERVER='192.168.0.1'    # or any else IP allocated to machine
SSH='22'
SSH_SERVER='12345'    # or another port you want
$IPTABLES -t nat -A PREROUTING -i $EXT_IF -p tcp --dport $SSH_SERVER -j DNAT
--to $SERVER:$SSH
$IPTABLES -t filter -A FORWARD -i $EXT_IF -p tcp --dport $SSH -d $SERVER -j
ACCEPT

note: server's sshd may listen on port 22 only.

Regards,

-- 
Márcio H. Parreiras @ Pedro Leopoldo - MG - Brazil


Por favor evite enviar-me anexos Excel (.xls), PowerPoint (.ppt) ou Word
(.doc);
Veja http://www.gnu.org/philosophy/no-word-attachments.pt.html

Please avoid sending me Excel (.xls), PowerPoint (.ppt) or Word (.doc)
attachments;
See http://www.gnu.org/philosophy/no-word-attachments.html


Navegue com segurança: http://br.mozdev.org

Surf safely: http://www.mozilla.com/en-US


Experimente http://www.broffice.org

Try http://www.openoffice.org


"A caixa dizia: Requer MS Windows ou superior, então eu instalei Debian/GNU
Linux!"
http://www.debian.org/index.pt.html

"The box said: Requires MS Windows or better, then I installed Debian/GNU
Linux!"
http://www.debian.org/index.en.html


http://pt.wikipedia.org/wiki/Linux

http://en.wikipedia.org/wiki/Linux


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