The problem doesn't lie with Avahi and mDNS specifically, but with the
Multicast Address (224.0.0.251) that it uses.
Guarddog blocks (or more precisely, doesn't specifically allow)
Multicast Traffic (224.0.0.0 - 239.255.255.255). There are two ways to
enable it:
1) Start Guarddog as normal and then issue extra 'iptables' instructions
which will allow the multicast traffic in and out. This is not a
particularly convenient solution and will need redone every time that
Guarddog re-configures the iptables.
2) Follow the suggestion near the bottom of this page -
https://help.ubuntu.com/community/HowToZeroconf
- which amounts to adding another zone to represent the multicast
traffic and then add mDNS(5353) as an allowed port for traffic from
that zone. Once working this shouldn't require any extra work.
Regards,
James Carr
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