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mrezrider's avatar
mrezrider
Aspirant
Nov 27, 2017
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 internet is ok .. but no worky worky .. I reboot R7800 and than it gives internet to all devices connected .. what could be the problem? why on modem reconnect .. r7800 looses abilty to give internet .. dns stays the same ip of r7800 stays the same .. nothing changes .. just maybe outer IP from ISP .. routers is 192.168.1.1 modem is 192.168.5.1 .. router gets 192.168.5.47 ip from modem ..fw is up to date
connection
internet
Troubleshooting
  • mrezrider's avatar
    mrezrider
    Dec 04, 2017

    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 .. 

13 Replies

  • mrezrider's avatar
    mrezrider
    Aspirant
    Nov 29, 2017

    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 ..

    • pec967's avatar
      pec967
      Luminary
      Nov 29, 2017

      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.

      • mrezrider's avatar
        mrezrider
        Aspirant
        Nov 29, 2017

        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)