@Amm0 thank you for a tip.
Well, i believe you are true and like i’ve previously mentioned it automatically recovers. But delay when it happens is not constant and may be up to 5 minutes (haven’t noticed more than that), which is not preferable for example for iptv. Router os build is 7.6 and lte modem has the latest firmware (http://forum.mikrotik.com/t/chateau-lte12-band-20-issues/163060/3). I’ve recently noticed this problem so haven’t checked everything (i.e. does it happen on other bands or not), but “lte,debug” logging isn’t helpful even with “packet”. After i’ve configured remote logging i’ll try to monitor this issue with “raw” enabled.
So, while a real cause of this problem is not clear i want to minimize network down time and that’s why i’m posting:
Logs right now capture only dns failures, but it can’t be a dns problem, because it happens not only with DOH, but with unsecure dns, too.
I haven’t yet managed to setup pinger to record ping results in logs, but if at that moment i manually run ping by ip mikrotik cli, for example 8.8.8.8, it’s unreachable (while watching iptv it’s easy to identify that moment).
p.s. when i’ll colect enough info, i’ll start a separate thread for sure.
inetdown_221227_23H01M13S_10min_window.log (213 KB)