[Bug 276838] ovpn(4) - problems with large TCP segments over IPv6 tunnel when DCO module is used at both ends

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From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 21 Mar 2024 11:13:05 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276838

--- Comment #4 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
In my case, the limits for the successful "ping  -4 -s $size remote_IP" are:
- in IPv6 tunnel, $size is limited to 1400
- in IPv4 tunnel $size limit is 1412
It was tested between FreeBSD stable/14 running OpenVPN 2.6.10 with DCO and
FreeBSD CURRENT running OpenVPN 2.6.9 as a client. 

It's not the case though. The problem I faced was too large TCP segments that
couldn't pass the tunnel thus preventing SSH sessions from being established
over tunnel.

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