server / hub: XG330_WP02_SFOS 17.0.6 MR-6
clients / spokes: XG115w_XN02_SFOS 17.0.6 MR-6
i used the steps in Sophos XG Firewall: How to configure Site-to-Site RED Tunnels for the basic Firewall RED Server / Firewall RED Client config which is working and looked over the "deployment scenarios" section @ Sophos Firewall: RED (Remote Ethernet Device) Technical Training Guide to see how failover is supposed to operate. I'm writing my own documentation to fill in some of the blanks from these articles. Is the correct approach to enabling internal traffic failover between multiple isp wan interfaces at the hub & spokes to have separate RED interfaces at each end on separate RED subnets for each isp link? Meaning a dual wan spoke that links with one dual wan hub should have 4 RED interfaces + subnets and a dual wan hub that links with 50 spokes each with dual wan should have 200 RED interfaces + subnets? Thanks
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