Cody Bunch Some Random IT Guy - OpenStack, DevOps, Cloud, Things

Enable Bonjour on UBNT USG-4P

17 Apr 2017

This here is super hacky, but it works.

Problem:

After segmenting the home network (kids, guest, random iot devices, etc), Bonjour stopped working.

Solution

The proposed solution is to SSH to the Security Gateway and run the following:

configure
set service mdns reflector
commit
save
exit

This works, great! Right? The problem with the above method, is that you are broadcasting your stuff out on the WAN Interface. I don’t know about you, but I don’t like the idea of what might show up on my AppleTV.

A better solution:

We start as prescribed. This makes sure the right services are installed and the config files are in place:

configure
set service mdns reflector
commit
save
exit

Now, undo that:

configure
delete service mdns
commit
save
exit

Now, edit /etc/avahi/avahi-daemon.conf with your corresponding interfaces. The relevant sections of my file look like this:

[server]
...
allow-interfaces=eth0,eth0.20,eth0.40,eth0.50,eth0.60
...

[reflector]
enable-reflector=yes

Finally, we add a script to ensure these services start on reboot & start them now:

echo "#!/bin/bash -
#title          :bonjour-fix.sh
#description    :Starts dbus and avahi on reboot on the USG-4P
#============================================================================

for service in dbus avahi-daemon; do {
    if (( $(sudo ps -ef | grep -v grep | grep "${service}" | wc -l) > 0 )); then {
        echo "[+] ${service} is running"
    } else {
        echo "[i] Attempting to start ${service}"
        sudo /etc/init.d/"${service}" start
    } fi
} done" | sudo tee /config/scripts/post-config.d/bonjour-fix.sh

sudo chmod +x /config/scripts/post-config.d/bonjour-fix.sh

sudo /etc/init.d/dbus start
sudo /etc/init.d/avahi-daemon start

Resources

This solution was put together from a number of forum posts:

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