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irish-rbr50's avatar
irish-rbr50
Aspirant
Dec 26, 2020
Solved

rbr50v2 and failed login attempts to rpis

I have an rbr50 as my main router/wifi in front of a cable modem running in modem mode.   I recently added 2 raspberry pis devices as pi-hole dns servers on my home network. However I now find a st...
  • antinode's avatar
    antinode
    Dec 28, 2020

    > The cable modem is supplied by my ISP, virgin media Ireland and, in
    > modem mode has, 1 option, modem mode or router mode.

     

       Still not as useful a description as, say, a maker and model number
    might be.  But, if it really is in modem-only mode, it shouldn't matter.
    Is the IP address of the WAN/Internet interface on the RBR50v2 a public
    address?

     

    > I have no port forwarding rules, port triggering is disabled, UPnP is
    > disabled.

     

       Did you verify that the ADVANCED > Advanced Setup > UPnp : UPnP
    Portmap Table is empty?

     

       I'm out of possible causes.  If you're really getting outside-world
    connections to multiple port-22 destinations, then I don't know what,
    other than UPnP, could do it.  Of course, with Netgear router firmware,
    almost any bug is possible, including leaving UPnP enabled/active when
    the indicator says that it's not.


       My next step would be to configure an explicit dead-end
    port-forwarding rule for (external) port 22, as suggested above.
    Presumably, that would supercede any residual/misguided UPnP activity
    for that port.  If UPnP actually is active, then attempting to add that
    rule might fail with a complaint like:

     

          The specified port(s) are being used by other configurations.
          Please check your configurations of USB Readyshare, Remote
          Management, Port forwarding, Port Triggering, UPnP Port Mapping
          table, RIP, and Internet connection type.

     

       If that were to happen, then I'd disconnect everything except one
    computer from the router's LAN (wired and wireless), restart the router,
    and try it again.  (Then restore the normal LAN connections.)