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Unable to access UDP localhost through onionmasq interface in a local chutney environment

See #120 (closed).

When running a local chutney + onionmasq + coturn, alongside a stupid UDP echo server on 127.0.0.1:8080 leads to the following bug when sending datagrams from 169.254.42.1:0 to 127.0.0.1:8080. The packet gets dropped (by the kernel probably) before it even reaches the TUN process, as onionmasq's and coturn's logs remain empty during these experiments. The system is configured with the parameters discovered in #120 (closed).

The only reply the kernel is giving, is an ICMP reply with "Destionation unreachable (Port unreachable)". The issue exists on IPv4 and IPv6. Screenshot_2024-11-27_at_13.09.54

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