[Bug 270927] emulators/virtualbox-ose: bridged network adapter - Guest OS Windows the default gateway is not available

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270927

            Bug ID: 270927
           Summary: emulators/virtualbox-ose: bridged network adapter -
                    Guest OS Windows the default gateway is not available
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: https://www.freshports.org/emulators/virtualbox-ose/
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: vbox@FreeBSD.org
          Reporter: andleb231175@gmail.com
                CC: vbox@FreeBSD.org
          Assignee: vbox@FreeBSD.org
             Flags: maintainer-feedback?(vbox@FreeBSD.org)
             Flags: maintainer-feedback?(vbox@FreeBSD.org)
                CC: vbox@FreeBSD.org

Hi all

Recently I upgraded my FreeBSD 11.4 with VirtualBox 5.2.44 (legacy port) to
FreeBSD 12.4 with Virtual 6.1.36. For many years Freebsd 11.4 + VirtualBox
5.2.44 (Host OS - FreeBSD, Guest OS - Windows 7/10 with bridged networking)
worked perfect.
Now I faced with following thing. Sometimes Guest OS Windows become unavailable
due to error "the default gateway is not available" in bridged networking. I
can fix it by Windows troubleshooter, resetting adapter or just switch on/off
network adapter, but after a while I get the same result "the default gateway
is not available". 
I tried to use "clean" Windows 7/10 installation and also got "the default
gateway is not available". Sure I tried all the fixing methods (reset
networking settings, turn off power management for adapter and etc).
I tried to use NAT adapter and it works perfectly, but I need Guest OS to be in
same localnet as Host OS.
Any idea?

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