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Comment on mDNS behind a gluetun container?

bigredgiraffe@lemmy.world ⁨1⁩ ⁨week⁩ ago

Have you tried adding 239.255.255.250/32 to your external subnets? This is the multicast address for SSDP which mDNS ultimately relies on if I remember right, I recall having to do this for Plex in the past.

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tripflag@lemmy.world ⁨1⁩ ⁨week⁩ ago
good idea, but a slight correction - mDNS and SSDP are entirely different things, rather SSDP was Microsoft’s initial proprietary take on the idea, and mDNS was created as the new and improved standard.

mDNS does multicast (send/receive) on 224.0.0.251 and ff02::fb while SSDP uses 239.255.255.250 as you mentioned.

But I think OP’s issue is that they’re on different subnets; mDNS expects the server and the client to have a perfectly overlapping subnets inside the same LAN. If the server has 10.0.0.3/16 and 192.168.1.3/24 then the client must also have 10.0.0.7/16 and 192.168.1.7/24.

there are workarounds to this, using avahi reflector, but that thing is buggy – specifically you need to disable NSEC on the server, and lock it to either IPv4 or IPv6.

I made some note on additional pitfalls while i was writing my own mDNS and SSDP severs for fun, they’re at the bottom of this page: ocv.me/copyparty/helptext.html

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tkw8@lemm.ee ⁨1⁩ ⁨week⁩ ago
I appreciate the response. I updated it and there was some success in that Jellyfin isn’t throwing errors anymore, which is a step in the right direction. So thank you for that. Unfortunately it still isn’t working. I did a little more log digging and found this:

[16:35:50] [INF] [1] Jellyfin.Plugin.Dlna.Main.DlnaHost: Registering publisher for urn:schemas-upnp-org:device:MediaServer:1 on 172.21.0.2 with uri http://172.21.0.2:8096/dlna/6a8078b6-cb55-4b46-acf0-64e99f2a7a79/description.xml

I think the issue might(?) be that DLNA is on a docker subnet and my home receiver is on a local 192.169.x.x subnet. I’m not sure though.
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