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Forum Discussion

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...
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.

    • devan_b's avatar
      devan_b
      Aspirant
      May 17, 2021
      No luck. I am a bit of a novice with ipv6 but I am only getting IGMP traffic from the modem to the router. When I try to ping the ipv6 address Nothing is received by the router.
      • User23562346's avatar
        User23562346
        Aspirant
        May 17, 2021

        I'm using a Tello sim.  My guess is Tello just by default blocks inbound content if htere's no matching state.  For me IPv4 or IPv6 would be fine, neither work.  However, from the router I can ping on either and things appear to work fine.

         

        Next step is to contact Tello and ask them if we can get an "unrestricted" connection (perhaps with a dedicated IP - though I don't need one).  It's possible only the bigger carriers can do this.