I have serious issues with 5G clients dropping connection, especially when starting a streamed video. But havent correlated anything to conntrack_max issues myself. I notice it gets induced by my ethernet clients as much as my wifi ones.have you noticed this happening when 5ghz drops clients?
352 is just a random number I tried out in the beginning. You could likely try 1352 and not 'brick' anything. Just take a backup of your router settings before experimenting changing the conntrack_max.352 is the highest value? I still start to get the "Apr 27 12:37:06 kernel: nf_conntrack: expectation table full" messages in the system log even with the nf_conntrack_expect_max set to 352 after about 12 hours+
I have tried to limit the maximum amount of connections allowed on my torrentserver down from unlimited to 1000 but it doesn't seem to help much. Are these messages something that one should really care / worry about? What effect does this actually have on network performance and stability?
As I mentioned, other manufacturers vary wildly in their values.... Ive seen specs on some consumer Ubiquiti Edge routers that have their conntrack_max @ 4096
Id recommend maybe trying to disconnect your torrent server and see if the messages persist, then from there you can confirm it is the culprit and adjust router values and torrent settings till you can suppress the messages
For me, I only did this to have the logs cleaner, Ive never noticed any connection issues at default or my altered values.