iptables setup debian pptp vpn

i follow manual here for install vpn pptp already is done and works well

but how i block port 80 ? for people dont surf web


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In order to block port 80, you would add this to your iptables shell script:

# /sbin/iptables -A INPUT -p tcp --destination-port 80 -j DROP
# /sbin/service iptables save