[Bug 242894] [bhyve] - issue with TCP/IP stack between 12.0-RELASE (guest) and 12.1-RELEASE (hypervisor)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242894

            Bug ID: 242894
           Summary: [bhyve] - issue with TCP/IP stack between 12.0-RELASE
                    (guest) and 12.1-RELEASE (hypervisor)
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: arkadiusz.majewski at iptrace.pl

Hello,

I've got an issue with TCP/IP network connection (including ICMP).
I suppose there is something wrong between hypervisor and guest network stack.

Hypervisor: bhyve on FreeBSD 12.1-RELEASE just upgraded
Guest: FreeBSD 12.0-RELEASE before upgrade

Hypervisor: bridge and tap for guest
Guest: vtnet virtual netowrk card


So, I was trying tu upgrade guest to 12.1-RELEASE. After a few attempts where I
was losing SSH connection, I saw there is an issue with network connection.
Deep investigation gave me the information, that after some time of network
traffic I was disconnected from network on TCP/IP stack, both bridge, tap and
vtnet network cards were enabled and active. Then after some minutes traffic
went well.
I was trying to download bigger file from Internet (100 MB), after 5 MB of
downloading I lost network connection.

I have others 12.1-RELEASES and they work. I upgraded them before upgraded
hypervisor. So, when hypervisor was as 12.0-RELEASE I hadn't got an issue.
I tried another guest (12.0-RELEASE) and the problem is the same.

To be more precise about my architecture, between hypervisor and that guest is
another guest called firewall, it means the firewall pass the traffic between
Internet and not upgraded guest yet I have an issue. The firewall (guest) is
already upgraded to 12.1-RELEASE. Of course, I upgraded that guest before
upgraded hypervisor.

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