[Bug 216610] TCP connections stuck forever in FIN_WAIT2 using IPFW

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216610

            Bug ID: 216610
           Summary: TCP connections stuck forever in FIN_WAIT2 using IPFW
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mail at ross.cx
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

I had netstat list thousands of tcp connections in FIN_WAIT2, lingering for
several weeks.

Google-searching I found this: https://forums.freebsd.org/threads/56007/

I tested the suggested setting net.inet.ip.fw.dyn_keepalive=0,
and since I use this setting, FIN_WAIT2 connections disappear within a few
minutes.

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