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devan_b's avatar
devan_b
Aspirant
May 16, 2021

LM1200 modem filtering ipv6 packets?

I recently purchased a netgear LM1200 and have been able to configure it as a WAN for my router.  Outgoing traffic flows well.

 

I would like to set it up as an end point for a VPN server using the ipv6 address provided by my cellular provider (TM).  If I ping the address from an outside server, it is unreachable.   The router is not receiving any packets from the modem. 

 

I tried to enable the diagnostic mode on the modem but that didn't seem to do anything. 

 

There is no mention of the diagnostic mode on the user manual.

 

Has anyone had success with this either in bridge mode (current) or routed mode?

 

I'd prefer not to have to use the routed mode if possible.

 

Thanks,

 

Devan

6 Replies

  • JohnPeng's avatar
    JohnPeng
    NETGEAR Expert
    May 17, 2021

    Qualcomm chipset uses SLAAC method to config IPv6 address, but most of routers use stateful DHCPv6 methid to assign IPv6 address. 

     

    This causes the compatibility issue when using IPv6 only address. I think the issue you are experiencing is due to such limitaion.

     

    Thanks

    John

    • devan_b's avatar
      devan_b
      Aspirant
      May 17, 2021

      I never thought of that.

       

      My router runs pfsense which is based on FreeBSD.  My options for optaining an IPv6 address include:

       

      DHCPv6

      SLAAC
      6rd tunnel

      6to4 tunnel

      track interface

       

      I'll try SLAAC next.

       

      Before I go down this rabbit hole, has anyone successfully used the LM1200 modem to act as a server WAN on IPv6?  

       

      I'm excited to find out.

       

      Thanks,

       

      Devan

       

      • User23562346's avatar
        User23562346
        Aspirant
        May 17, 2021

        Any luck?

         

        I just got mine setup and outbound traffic is fine, but can't do inbound traffic.  The thing is in bridge mode so I don't expect it to be filtering but inbound HTTPS, OpenVPN, and even ping doesn't work.