[Bug 210408] Problem with outgoing traffic using ipfw and kernel nat originated from local address

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210408

            Bug ID: 210408
           Summary: Problem with outgoing traffic using ipfw and kernel
                    nat originated from local address
           Product: Base System
           Version: 10.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: aigars at ugunssiena.lv
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

There is a problem with outgoing connections made from local address which is
aliased using ipfw kernel nat. Sending out data stops after 20-30 packets.
Connections from other hosts using this host as gateway have no problem.
The problem disappears when RXCSUM,TXCSUM,TSO4,TSO6 are switched off.
The same problem is with natd but then only TSO4,TSO6 needs to be switched off.
NIC driver - igb.

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