[Bug 237197] ipnat NAt failures

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237197

            Bug ID: 237197
           Summary: ipnat NAt failures
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: netadmin at utvault.net

Hello,

I am runnning VPN gateways based on openvpn / Freebsd / ipnat.

This setup worked flawlessy for years until I upgraded from Freebsd 9 to
Freebsd 11.2 or 12.0.

Without changing anything in the software setup, some connections are getting
dropped, the nat drop count is steadily increasing over time (a few hours from
reboot) and most people are complaining about speed issues .... Not good.

Hardware is the same, the only thing changed is the O.S version.

Kernel is stock kernel with the #define LARGE_NAT in the ip_nat.h.

After spending a week trying to chase ghosts, I'm quite puzzled.

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