User lost IPv4 connectivity due to ISP issues but still had working IPv6.
They set up a WireGuard VPN server on a VPS with both IPv4 and IPv6 addresses.
Their home device connected over IPv6-only and tunneled IPv4 traffic through the VPN.
They used Linux network namespaces to run another VPN over the WireGuard interface.
They ran Docker inside the network namespace by using unshare and mount namespace tricks.
They resolved intermittent failures by lowering the WireGuard MTU to prevent packet drops.
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