• [6.12] SSH fails to start when "normal" interfaces only have IPv4 but "extra" interfaces have IPv6

    EDACerton

    By EDACerton

      • Minor

    Posting this on behalf of multiple Tailscale plugin users.

    Related Discussions

    https://forums.unraid.net/topic/136889-plugin-tailscale/page/7/#comment-1272479 (contains diagnostics)

    https://github.com/dkaser/unraid-tailscale/issues/57 (further discussion, includes the relevant configuration file)

    Symptoms

    SSH will fail to start when:

    • Normal/Wireguard interfaces only have IPv4 addresses, and
    • Extra (e.g., tailscale) interfaces have IPv4 + IPv6 addresses.

     

    In this configuration, the sshd_config file is created with the following information:

      

    Port 22
AddressFamily inet
ListenAddress 192.168.1.66
ListenAddress 100.69.69.16
ListenAddress fd7a:115c:a1e0:ab12:4843:cd96:6245:4510

     

    This is an invalid configuration, since "AddressFamily inet" forces sshd to only accept IPv4 addresses. As a result, the service fails to start.

    Fix

    The check() function in /etc/rc.d/rc.library.source does not consider "extra" interfaces when setting the values of $ipv4 and $ipv6. It then uses these variables to determine if AddressFamily should be set to inet, inet6, or any.

     

    /etc/rc.d/rc.library.source should either consider extra interfaces when setting the sshd family, or AddressFamily should always be set to any.

    • Upvote 2
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  • Status Definitions

     

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    Priority Definitions

     

    Minor = Something not working correctly.

     

    Urgent = Server crash, data loss, or other showstopper.

     

    Annoyance = Doesn't affect functionality but should be fixed.

     

    Other = Announcement or other non-issue.