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XGS116w use 3G/4G Module For Redundancy Issue

ken liu

XGS116w (SFOS 19.5.1 MR-1-Build278)

I want to use  3G/4G moduel as backup Wan and try to test the failover. However, it doesn't work!  

The log show the traffic still go to the Primary Interface, but it is down status~

Unless I add a route "0.0.0.0 0.0.0.0  to WWan1", then I can access Internet.

After I  plug-in the primary wan interface, the traffic doesn't shift to primary, I still use the backup wan.

I think it doesn't make sense, I just wonder know is there anything wrong with the setting???

I already referenced the following articles:

1.https://support.sophos.com/support/s/article/KB-000038337?language=en_US

2.https://doc.sophos.com/nsg/sophos-firewall/19.0/help/en-us/webhelp/onlinehelp/AdministratorHelp/Routing/Gateways/RoutingConfigureGatewayBalancing/index.html

3. Sophos Firewall: Configuring the 3G/4G modules for use with Verizon 



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