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Fix interface selection for IPv6-only hosts #4380

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Commits on May 7, 2024

  1. Fix interface selection for IPv6-only hosts

    Instead of considering the full IPv4 routing table, we only look for
    IPv4 default route and IPv6 routes shorter or equal /8 (for instance
    `2000::/3`). Since the `conf.route6` is not ready yet when we first run,
    we reload `conf.ifaces` after loading `route6.py`.
    
    This fixes secdev#4304
    
    Signed-off-by: Ondřej Caletka <ondrej@caletka.cz>
    oskar456 committed May 7, 2024
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