New Network Paradigm

Problem: When the Flex is connected to the mobile hotspot with reverse ssh tunnel the radio can be accessed just fine from a pc but not from the Maestro. When the Flex is connected to the dedicated Internet connection with a static i.p. and port forwarding the Maestro works fine but the pc experiences drop outs and packet loss.

Solution: Change the existing conventional router to a Dual WAN router. This reduces the number of LAN’s from two to one. With only one LAN the Flex is always on the same LAN as the client. The Maestro can come in on the dedicated Internet connection and reach the Flex on the LAN. The pc can come in on the reverse tunnel and reach the Flex on the LAN. With Flex’s new Multi-Flex protocol the two can come in at the same time and share the Flex.

Several models of Dual WAN routers are available in the $100 range and they are currently be evaluated. One example is the Ubiquiti EdgeRouter Lite shown above. Notice the ports are labelled eth0, eth1, and eth2 rather than WAN and LAN. The ports are configurable to be either function.

Followup: It’s never as easy as it sounds. Load balancing is the first issue. The dual wan router is now installed, configured, and working as designed but not doing what was hoped for. At issue is which WAN a client is connected to when the reverse tunnel is established. If it’s on the wrong WAN the whole concept is defeated. One available option is to specify what ports go to which WAN. A SSH tunnel is using the SSH port which is 22. Directing port 22 traffic to the higher speed WAN will be the next experiment. Ultimately the Edgerouter was pulled from service and returned to Microcenter. The whole idea of a Dual WAN really hasn’t proved out. The original one-WAN router is back in the circuit and all is working just fine. As for having just one LAN, the two NUC’s are tied together back to back, one on each LAN. The interconnect is the second ethernet port for each NUC. The hardware is a USB ethernet dongle. The two LAN have different subnets. To reach the other LAN one just enters the address for the other LAN and the NUC routes out the second ethernet port. Thus there are two LAN’s but they are routed to each other by the NUC’s. Crude but it works. Later the interconnect was removed and one NUC has a connection to both LAN’s. No conflicts have occurred. On that NUC a reverse tunnel is established and connected to from the outside world. Other resources can be reached on the other LAN from that same NUC with no issues. It appears the dual wan router was never needed. The NUC is handling any routing needs quite elegantly. There are two LAN’s but the second LAN has only one resource connected and that’s the NUC’s second ethernet port. Every other resource is connected to the main LAN including the Flex radios. It all works well so far.

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