i am contemplating the idea of switching our current FG 80D to a 90D and implement SD-WAN using our current 100Mbit fiber circuit (main) and the 4G LTE (cradlepoint) for internet backup.
Our current ATT router for the main circuit is doing an internal natting for VoIP and using one of the public IP in the block assigned.
No this is the first time i set up SD-WAN and i'am trying to answer a few questions related to it:
- If we use the second circuit - cradlepoint (the SIM has a static public IP) with IP Passthrough, internet would of course be up, but what happens to VoIP? Assuming that just the fiber is down, but the ATT Router is working ok, can the VoIP still be up if the active circuit is now the cradlepoint?
- Could i work with subinterfaces to bring a second VPN tunnel up in case we are accessign the internet with the backup circuit?