Quite pleased with myself. My system got two got two ip's on different subnets and and require different macs but just one network interface (A typical Hetzner setup for those who recognise it) . While it was working fine to configure to config both addresses on the one interface, I wanted to split ip two up into a separate virtual interface.

It took some trial and error, but finally managed to get it working. πŸ˜…

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Slight update on this one, something seems to have happened during the night, woke up and it was back to being broken. The solution seems to be in sysctl somewhere, but tbh I'm out of patience for the moment. Reverting to the old two-ips-one-nic setup and wrapping it up in netfilter

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