[Bug 236309] [axe] pf/nat/txcsum broken on 12

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236309

            Bug ID: 236309
           Summary: [axe] pf/nat/txcsum broken on 12
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: eborisch+FreeBSD at gmail.com

I have a firewall box where the outbound connection to cable is ue / axe. If
txcsum is enabled, PF-NAT-ed outbound traffic has a zero checksum. Locally
generated outbound traffic is fine.

Disabling txcsum resolves the issue and restores connectivity through the NAT.

Worked fine on 11.2-p9.

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