For this test, please have an Apple device on the network, and select the print function on the device, as this will initiate an mDNS ...
The firewall should be set to pass all traffic (rule 9), and by blocking port 5353 (rule 8) the error messages will stop,
of course this will also block mDNS for Apple devices and kill AirPrint ...
The following errors will flood the log:
Facility: daemon
Message: vy_plugin: E: failed to parse DNS qname: Resource temporarily unavailable in proto 17 packet of size 88 from 192.168.5.144:5353 to 224.0.0.251:5353 [45 00 00 58 00 00 40 00 FF 11 D4 60 C0 A8 05 90 E0 00 00 FB 14 E9 14 E9 00 44 09 B6 00 00 00 00 00 02 00 00 00 00 00 00 07 5F 74 65 6C 6E 65 74 04 5F 74 63 70 05 6C 6F 63 61 6C 00 00 0C 80 01 0C 5F 73 6C 65 65 70 2D 70 72 6F 78 79 04 5F 75 64 70 C0 19 00 0C 00 01]
Message: vy_plugin: E: failed to parse DNS qname: Resource temporarily unavailable in proto 17 packet of size 89 from 192.168.5.121:5353 to 224.0.0.251:5353 [45 00 00 59 29 B3 00 00 02 11 E7 C4 C0 A8 05 79 E0 00 00 FB 14 E9 14 E9 00 45 09 C0 00 C2 00 00 00 02 00 00 00 00 00 00 0B 5F 67 6F 6F 67 6C 65 63 61 73 74 04 5F 74 63 70 05 6C 6F 63 61 6C 00 00 0C 00 01 09 5F 32 33 33 36 33 37 44 45 04 5F 73 75 62 C0 0C 00 0C 00 01]
Message: vy_plugin: E: failed to parse DNS RR in answer section of length 33 at offset 21 [0B 31 39 32 2D 31 36 38 2D 35 2D 37 05 6C 6F 63 61 6C 00 00 01 80 01 00 00 0E 10 00 04 C0 A8 05 07], unsupported resource records class (Resource temporarily unavailable)
Not sure if this should be looked at or ignored by support 
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