it's a normal desktop machines iptables firewall: 

If i want to block udp on dport 80 on the output chain, then is this enough? i 
want to only allow tcp on it!
iptables -P OUTPUT DROP
iptables -A OUTPUT -o $PUBIF --dport 80 -j ACCEPT


or i need this rule?
iptables -P OUTPUT DROP
iptables -A OUTPUT -o $PUBIF -p tcp --dport 80 -j ACCEPT


the second one is the good one?


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