I have the following situation. There is HQ and remote office A, B and C. HQ and office A both have a Pelink Balance 710 making the PepVPN with Speedfusion. Office B and C have a MPLS connection to Office A so all traffic from office B and C goes first to Office A from where the traffic goes either via PepVPN to HQ or directly out on the Internet.
Office A ---------(Internet/PepVPN)------------- HQ
This month the fiber cable to Office A which carries the MPLS and Internet connection was cut twice due to excavation works. Office A already has several ADSL connections connected to the Peplink Balance so that connection was never lost but now I also want to setup a backup connection for office B and C.
My thought is to place a Peplink balance in both Office B and Office C and connect one or several ADSL lines to it for backup. The question is though how to setup the PepVPN?
Can I setup a PepVPN from office B/C to HQ over the MPLS or do I have to setup first a PepVPN from Office B/C to A and then sent the traffic over the existing PepVPN between Office A and HQ?
Is there another way to do this? Is it possible that in normal operation, all traffic is routed via MPLS to Office A but in case the MPLS goes down the Peplink Balance in Office B/C fails over to a PepVPN that only uses the ADSL line(s)?
Any help is appriciated.