vbox FreeBSD 12 and bridged mode virtualbox

Hello,

I've been using FreeBSD and VirtualBox for many years to run Windows guest in a safe environment. The guest systems run normally in the bridged mode, until including FreeBSD 11.4 I had no problems to do this. But with starting with FreeBSD 12, the VMs are running perfectly in NAT mode. But if I switch to the bridged mode, the machines are no longer connected to network after a while. This also applies to the new version 6 of the VirtualBox. Is there still any switch that I have to throw?

TIA

Harald
 
Some more changed in 12.x after 11.x.
Network performance dropped to almost nothing, it freeze? and loose connections when upload over ssh into a 12.x guest.
Used as host is freebsd 12.x with a freebsd 11.x. 12,x guests.

Bridged mode, and intel nics are used on a supermicro x10 serie.

I can only use freebsd 11.x as host and use any freebsd guest without problems.
I remember that was a fix in freebsd 12 for downloading problems, they did not fix uploading to the os i think.
 
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