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After a lot of digging, I believe this was related to IGMP sniffing not working as I expected. After that was disabled on the downstream switches the multicast traffic delivery has been very reliable.
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#2
23.1 Legacy Series / udpbroadcastrelay swallowing packets?
February 19, 2023, 06:39:29 AM
I've had udpbroadcastrelay configured to relay SSDP across subnets for quite a while, and it's worked exactly as expected. However since 23.1 (I believe) it will only work for a few minutes and then packets stop being relayed. If I stop/start the service then packets will begin to flow properly again, but only for a few minutes.
To test things, I set up a rule to log any UDP packets sent to 239.255.255.250:1900 from my LAN and placed it first in the rule order.
It seems that udpbroadcastrelay is swallowing these packets before they even hit the firewall. Is udpbroadcastrelay the likely culprit here? Or could there be another angle I'm not considering, like IGMP or another network device misbehaving?
To test things, I set up a rule to log any UDP packets sent to 239.255.255.250:1900 from my LAN and placed it first in the rule order.
- With udpbroadcastrelay stopped, sending an SSDP packet from my LAN will hit opnsense but go no further.
- With udpbroadcastrelay enabled, sending an SSDP packet from my LAN will hit opnsense and relay to my IoT subnet.
- After a few minutes, sending an SSDP packet from my LAN will show nothing in the live firewall logs.
- Disabling udpbroadcastrelay will immediately show SSDP packets arriving from the LAN hosts as in #1.
It seems that udpbroadcastrelay is swallowing these packets before they even hit the firewall. Is udpbroadcastrelay the likely culprit here? Or could there be another angle I'm not considering, like IGMP or another network device misbehaving?
#3
General Discussion / Re: UDP Broadcast Relay
February 18, 2023, 08:05:11 PM
It seems that since upgrading to 23.1, my setup for SSDP which had been working reliably in 22.X is now only working for a short time and then silently stops working. The daemon is still running but packets are no longer forwarded between subnets.
If I change the config of udpbroadcastrelay in the UI to force a restart of the daemon it will work for a few minutes but then packets stop flowing stop again. For example, if I change the interfaces to something else and then back.
Has anyone else encountered this? I can't imagine what else could cause this besides udpbroadcastrelay having some issues.
If I change the config of udpbroadcastrelay in the UI to force a restart of the daemon it will work for a few minutes but then packets stop flowing stop again. For example, if I change the interfaces to something else and then back.
Has anyone else encountered this? I can't imagine what else could cause this besides udpbroadcastrelay having some issues.
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