An ISP outage broke IPv4 connectivity but IPv6 still worked.
A WireGuard VPN tunnel on a Hetzner VPS routed IPv4 traffic over IPv6.
Network namespaces were used to run a separate work VPN without interference.
Docker was run inside the network namespace using unshare and mount tricks.
MTU issues on the WireGuard interface were resolved by lowering the MTU.
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