this post was submitted on 15 Jan 2024
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I have a network set up something like the following:

Device A <---> Router A <---> Router B <---> Device B

where Router A is a tp-link Archer AX73, and Router B is a tp-link Archer C7. Router B is flashed with OpenWRT, and Router A is using stock firmware. Router B is set up to be a wireless bridge between Router A's network, and its own (it was set up using this guide).

What I am wondering is if Device A can find, say, Device B.local, using Avahi (assuming Device A, and Device B both have Avahi installed, and running), over this bridged network. So far, I haven't been able to get it to work, so I'm wondering if it is possible at all. I have read that Avahi only works on a local network, but I was wondering if it could be bridged.

UPDATE (2024-01-16T01:28Z):

The issues that I mentioned in this post have since been solved. The majority of the issues stemmed from the fact that the relay software that I was using, relayd, doesn't support ipv6. All the tests that I was conducting were defaulting to ipv6, so it was appearing like the bridge was failing unpredictably. Since that realization was made, and countermeasures were enacted, the problem was solved.

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[–] SheeEttin@programming.dev 1 points 10 months ago (1 children)

I'm not familiar with how Avahi works, but I assume it uses broadcast packets. Do you actually have routing between two networks, or is it just a wireless bridge? Do broadcast packets transit the bridge? Have you taken a packet capture from both sides?

[–] Kalcifer@sh.itjust.works 1 points 10 months ago

I’m not familiar with how Avahi works, but I assume it uses broadcast packets.

It does, yeah; multicast DNS uses multicast packets e.g. 224.0.0.251 (ipv4).

Do you actually have routing between two networks, or is it just a wireless bridge?

It's just a wireless bridge.

Do broadcast packets transit the bridge?

They do.