[Bug 234426] SSH/SFTP connections from a 12.0-RELEASE VMware VM to the outside world are dropped with "ssh_packet_write_wait: broken pipe" errors

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234426

            Bug ID: 234426
           Summary: SSH/SFTP connections from a 12.0-RELEASE VMware VM to
                    the outside world are dropped with
                    "ssh_packet_write_wait: broken pipe" errors
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: dcarmich at dcarmichael.net

Created attachment 200540
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200540&action=edit
tcpdump trace of an attempted SSH/SFTP session from the VM to the outside
world.

System: VMware Fusion 11.0.2 (build 10952296) running on macOS 10.14.2.

When I attempt to make SSH/SFTP connections from a 12.0-RELEASE VMware Fusion
VM to the outside world, they are dropped with "ssh_packet_write_wait:
Connection to (IP) port 22: broken pipe."

However, when I make SSH/SFTP connections from the outside world to the VM,
they are successful.

I've attempted this both with OpenSSH in the base OS and OpenSSH from ports
(security/openssh-server) and get the same issue.

I've even attempted changing the virtual Ethernet adapter from the default
e1000/em driver to the vmxnet3/vmx driver, and still get the same issue.

Would this be a VMware problem, FreeBSD kernel problem, or both?

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