[Bug 276838] ovpn(4) DCO module breaks SSH connectivity

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 05 Feb 2024 13:16:49 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276838

            Bug ID: 276838
           Summary: ovpn(4) DCO module breaks SSH connectivity
           Product: Base System
           Version: 14.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: zarychtam@plan-b.pwste.edu.pl

FreeBSD 14.0-STABLE stable/14-n266312-78e5cafd6dd0 with openvpn-2.6.8_1
installed utilising DCO acceleration blocks IPv4 SSH access over IPv6 tunnel
when both ends use DCO. Disabling DCO on at least one endpoint unbreaks SSH
IPv4 connectivity over IPv6 established tunnnel.

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