JD wrote: > On 03/19/2011 02:19 PM, Bill Davidsen wrote: >> erikmccaskey64 wrote: >>> 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? >>> >> You don't want to do that, if you block everything on OUTPUT things like DHCP, >> ARP, ICMP, etc, fail. You would need pages of ACCEPT rules. >> >> iptables -A OUTPUT -p tcp ! --dport 80 -j REJECT >> >> Would at least block only tcp, although I bet you will find that you want to do >> mail and such. You are rapidly entering deep waters, I fear, but it's your machine. >> > Blocking output on port 80 will render your web browsers largely useless, > because web browsers send connection requests to web servers on port 80 > using the TCP protocol. > Reread that command again, it blocks all tcp EXCEPT port 80 -- Bill Davidsen <davidsen@xxxxxxx> "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
