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Solved
R7800 losing internet after modem reconnection
My ISP has Asus modem/router that I still use while it has/routes IPTV .. R7800 is connected and in router mode .. all is good until modem reconnects every 24h .. after that R7800 gives wifi .. says i...
I have installed Voxel fw .. same as netgear but newer versions .. I dont think that made it much better
But I have added is 3rd DNS server in router settings .. I have two Googles and 3rd is modem 192.168.5.1
and now after modem reconnect I still have internet .. but delay on page load is few seconds, noticable .. so I guess router uses 3rd dns, modem address .. after I reboot router I have much faster load of web .. there is no pause on load .. starts to load after 1 sec ..
hmm .. that is what I have now .. really puzzled ..
update
today again same thing .. on modem reconnect no internet
BUT
on iPhone that is connected to R7800 some apps have internet after reconnect
like TuneIn Radio and Facebook app, Whatsapp .. others like web/safari, mail, gmail do not work .. I hope this helps ..
My guess is that this has something to do with your "double-NAT" configuration. I would either change the configuration of the modem/router to modem-only, or change the R7800 to AP mode.
I also think something about NAT, disabled NAT/UPnP on modem.
Netgear support wrote to find MTU .. and I think mine is 1460, so I set that up.
modem works as a router also .. but is ISP special fw .. very few options to set ..
I will try to turn off what I can on modem .. and keep R7800 as router
disabled NAT/UPnP on modem
set R7800 address as DMZ on modem
turned off all firewalls on modem
kept DoS protection ON on modem
set MTU 1460 on R7800 (modem doesnt have that option)
did all above .. same problem ..
disabled DHCP on modem
made factory reset on R7800
manualy set everything ..
waiting tomorrow