Mikrotik router version 5.20. PPOE User sometimes disconnected but why ? we can't find it. what is the problem? we are tired.. please help me.

Check /log print for disconnect reason.

yes, i check but no reason find. Just show disconnect.

Probably you're losing link for a brief moment somewhere. See if something is rebooting or if you're losing ping connectivity with them occasionally.

Also couldn't hurt to upgrade to latest v6

Thanks for reply. But there is no ping loss in that time. ping reply 1ms..

Please post here log of disconnect messages from your PPPoE server.

i have the same problem ..... may be we need to update to 5.25 or more ....

PPPOE works well only on perfect networks. I have 1000s of users running on pppoe and mysteriously some nas / users logs out at the same time. Comparing with hotspot it has more resiliency to sustain network drops. Even latency going high will make the users logout. I'd shifted most of the users to hotspot. Reason is yet to be found and networks on fibre optic do sometimes suffer same problem but very less. In your case or anyone's case the logs will be telling peer not responding. AFAIK ppppoe is useless unless the networks are on technologies like gepon, adsl etc but not worth running on wireless or ethernet. I'd seen where wireless p2p having 80+ aggregated throughput still the users logs out at the same time when required bandwiddth is not even 30% of throughput.