[Bug 256657] [tcp] RACK unsuitable for jails on stable/13

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 16 Jun 2021 21:31:36 UTC

--- Comment #5 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
(In reply to Michael Tuexen from comment #2)
>Could you share the commands how to reproduce that?

Try to connect from the jail to the socket on the host:
mysql -p -u root -h

The host has MariaDB server (mariadb103-server-10.3.29) running with
skip_networking=off set.

(In reply to Michael Tuexen from comment #4)
>When using nc, did you enter CTRL-D on the client side right after starting the client?

When nc(1) or ssh(1) is used from the jail then the connection to the host can
be established and is working without issues.

Both traffics dumps were collected on the same lo0 of the jail host with the
filter 'tcp and dst or src port 3306'. Connections with ssh(1) and nc(1) were
tested and working prior to submitting this PR.

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