A little iptables help

[t004 at kbocek.com (Kirk Bocek)]

Rodrigo Barbosa wrote:
> 
> Humm, that should be relatively simple:
> 
> iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j ACCEPT
> iptables -t nat -A PREROUTING -p tcp --destination-port 8000 -j DNAT --to-destination ${DESTINATION_SERVER}
> 
> iptables -A FORWARD -p tcp --destination-port 8000 -d ${DESTINATION_SERVER} -s ${SOURCE1} -j ACCEPT
> iptables -A FORWARD -p tcp --destination-port 8000 -d ${DESTINATION_SERVER} -s ${SOURCE2} -j ACCEPT
> iptables -A FORWARD -p tcp --destination-port 8000 -d ${DESTINATION_SERVER} -s ${SOURCE3} -j ACCEPT
> iptables -A FORWARD -p tcp --destination-port 8000 -d ${DESTINATION_SERVER} -s ${SOURCE4} -j ACCEPT
> iptables -A FORWARD -p tcp --destination-port 8000 -d ${DESTINATION_SERVER} -j REJECT --reject-with tcp-reset
> 

Rodrigo, wouldn't the port filtering take place in the INPUT chain?

iptables -P INPUT DROP
iptables -A INPUT -p tcp --destination-port 80 -j ACCEPT