>>>>> "yy" == yukku yukkoooooo <yukku19752000@xxxxxxxxx> writes: yy> -A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j yy> ACCEPT So that you can receive multicast DNS packets which are part of zeroconf, enabling you to find available network services without configuration. yy> -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT So that you can receive the CUPS printer availability broadcasts from the network. - J<