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Stuartsjg's avatar
Stuartsjg
Aspirant
Mar 21, 2018

LB2120 Bridge mode, not passing dynamic IP to router

Hello, I am using the LB2120-100-UKS which i have just received from new and wanted to use the bridge mode with a TL-R470+ load balancing router.

I am connecting ADSL via the TL-R470+ with no issues (PPPoE in UK).

 

The LB2120 is working well in both router and bridge mode with a PC (direct connection, no routers or switches, PC just set to obtain address automatically).   In router mode, i get an IP in the range of 192.168.5.x as i would expact.   In bridge mode, i get the WAN IP which is shown in the mobile 4G status window from the LB2120, so i know the (W10) PC is picking up the dynamic 4G IP address.   If i restart the modem, it may (not always) get a new IP and the PC picks this up no issues.

 

When setting the WAN port i intend to use for 4G on my TL-R470+ to "dynamic" the poor thing just sits forever and tries to connect with no success at all, looks like it never receives an address.

 

If i set the "Static" and i enter what i noted from a succesfull PC connection, then the TL-R470+ makes a sucesfull connection to the LB2120 and i get 4G internet.

 

Whats more, the load balancing works, and i get the benefit of the ADSL (slow but unlimited) and the 4G (fast but limited).

 

So i know the system works as i want however i cannot use a static WAN IP on my 4G connection.

 

My carrier, EE, wont offer fixed IP address on the consumer data tariff i have, so every few hours, or after a reboot, i would need to manually find the new IP, default gateway & DNS and update the details on the TL router so it can connect.

 

I can only imagine that the router is getting confused as it "sees" both the 192.168.5.1 of the router admin page and the WAN IP and it cannot pick which to settle onto.  Or perhaps it only sees 192.168.5.1 and its waiting on an IP assignment.

 

How can i get around this?  Is it a fault with the TL-470+ router, or the LB2120.   Posts on other LTE models suggest this issue has been known for some time with any router.

 

I can get it to work with the LB2120 in router mode, and the TL470+ in dynamic (i would probably pick static outside the DHCP pool to avoid conflict) and it gets an IP in the 192.168.5.x range but then double NAT is probably not always a good idea.   This does at least mean the LB2120 takes care of the 4G WAN IP by ittself and i dont need to worry about it.

 

Any help would be apprecaited.


Thanks,

Stuart

 

4G
bridge
Firmware
Installation
LB2120
Mobile Routers
Router
TL-R470+
Troubleshooting
wan

3 Replies

  • Stuartsjg's avatar
    Stuartsjg
    Aspirant
    Mar 21, 2018

    Hello,

     

    I had been trying different things such a different ports on my router, etc none of which had any effect.  After each change, i tried again with a reboot making sure only to make one change at a time.

     

    I noticed there was the failover settings in the LB2120 which was set to automatic.  I was never going to use this as failover so set it to mobile network only not expecting anything much to happen.

     

    Just out of curiosity, i also set the unit from router to bridge mode and let it connect.   Once it came up and established a link, within a few seconds, my router had a dynamic IP from the LB2120 which matched the 4G WAN IP.

     

    So, the issue i was having appeard to go away after disabling the failover function and forcing only to mobile.

     

    Perhaps its some way the LB2120 announces on its LAN port which service is providing IP.

     

    I need to shut down for the night, i am using my mobile phone SIM card untill a dedicated data card arrives so ill test again tomorrow to ensure it wasnt just pot luck.


    Thanks,

    Stuart