[tjohns]

Bonjour is built on top of DNS. You don't need a layer 2 tunnel to make it work.

However, it normally does rely on multicast. Rather than trying to bridge broadcast domains (which is going to cause performance issues), a more efficient option is to setup an Avahi mDNS reflector on either end of the tunnel to rebroadcast mDNS packets.

See, for example: https://www.reddit.com/r/WireGuard/comments/g80bxf/comment/h...

Alternatively, there's also a Wide-Area Bonjour service that works over unicast and doesn't need any special packet forwarding, provided you run a Bonjour-aware DNS server:

http://www.dns-sd.org/serversetup.html

https://help.dyn.com/bonjour-and-dns-discovery/

(More generally, Layer 2 tunnels are best avoided unless you really need them for something arcane, like IPX or NetBIOS.)

[simonjgreen]

You are technically correct (best kind of correct) however, in reality, I see folks using L2 tunnels to solve for bonjour etc all the time. Usually those without networking knowledge to solve the forwarding.

[systems_glitch]

Yeah, you can do it the right way...or you can just tunnel layer 2 and forget about it. I see it done a fair bit for both Bonjour/Avahi and DHCP (why?).