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OpenVPN connections on macOS Big Sur

Seemingly, macOS Big Sur does not support NAT based OpenVPN connections - it connects, but you then cannot reach anything on the remote network. The “fix” is to set up a static route, sudo route -n add $utun-ip-address

Rather than having to do this manually on each computer, you can also have OpenVPN push the route by adding it under Configuration > Advanced VPN > Private Routed Subnets (Optional).