We are using a Balance 305 for a small ISP. We have 2 WAN ports connected to fiber. We are looking to add a mobile Internet device to the router but do not want it to ever be available as a failover for customers. Our desire is to have it available for our network admins to access the router in the case of a failure on both WAN ports. In addition, we would like our internal management VLAN (VLAN 5) to be able to access the mobile Internet device for outbound traffic in the event of a dual WAN failure. This way, our management servers can still send emails and SMS pages to our techs if both fiber lines go down.
I don’t see a way to set this up where only VLAN5 will ever have access to the Mobile Internet WAN and I can exclude all other VLANs. We will use a DDNS service to be able to come in to the router from the outside using the mobile Internet WAN.