Hi, I have successfully implemented a WAN failover using a Netgear LB1121 = 4G/LTE Modem over a WireGuard tunnel to a VM instance (static IPv4) in = the cloud. Since most 4G/LTE providers only support outbound-only (NAT'ed), = IPv4-only, dynamic IPv4 address networks, by using WireGuard to a static = IPv4 endpoint a bidirectional dual-stack IPv4/IPv6 network is created. = Works very well. Question ... When failover occurs a 0.0.0.0/1 + 128.0.0.0/1 route is added to the wg0 = interface via the cloud VM WireGuard address. There is a secondary WireGuard peer (dynamic remote endpoint) other than = the failover 4G/LTE peer, which on failover tries to re-establish over = the WireGuard failover peer, which fails. Possible solutions: 1) On failover add a route for the secondary endpoint (extracted using = 'wg') and route to the ethernet interface the 4G/LTE Modem is connected. = Fingers crossed the dynamic remote endpoint does not change during the = failover. 2) Possibly reduce the MTU of the secondary WireGuard peer to allow it = to work within the WireGuard failover peer. If so, what MTU would be = required for WG to tunnel within another WG ? Possibly would require = separate wg0 and wg1 interfaces for matching MTU's ? Appreciate any comments. Lonnie