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Description of problem: While in theory it's not necessary, because both mdns and upnp operate on the local subnet and thus link-layer broadcasting is enough to ensure all hosts get the packets, my switch+router (Alice Gate VoIP AGPF_4.5.0sx, by Pirelli) refuses to switch packets between ethernet and wi-fi unless all hosts declare they partecipate in a multicast group using IGMP. This means that effectively mDNS and UPnP communication is blocked, and the relevant options in the firewalld GUI have no effect. I believe the correct solution would be for firewalld to offer a configuration option inside service XML files to mark that multicast is required. Version-Release number of selected component (if applicable): firewalld-0.3.8-1.fc20.noarch How reproducible: Always Steps to Reproduce: 1. Enable a multicast service such as mDNS from firewall-config or firewall-cmd 2. Have a switch/router that requires IGMP for local multicast 3. Attempt to send multicast packets to the other host and to get replies (for example with "getent hosts <hostname>.local") Actual results: Packets are not delivered, because the hosts are not marked as inside the multicast group. wireshark shows no activity, and neither does iptables -j LOG Expected results: Packets are delivered fine, reach the appropriate filter rule, and then are forwarded to the application or rejected as configured. Additional info: A successful workaround is firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT 0 -p igmp -j ACCEPT For the record, this problem affects old system-config-firewall on EL 6 too, and in there one can solve this problem by editing /etc/sysconfig/iptables.
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