[Bug 266598] if_ovpn(4) DCO module not supporting correctly IPv6 tunneling

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 266598] if_ovpn(4) DCO module not supporting correctly IPv6 tunneling"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 26 Sep 2022 06:59:28 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266598

--- Comment #5 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
Definitely, it's ToS that makes packets invisible to tcpdump(1) on the tun(4)
link, reproducible with netcat. To reproduce run

server:
nc -6 -l 52555
client with DCO:
nc -T lowdelay -6 server 52555

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