[Bug 257798] Ubuntu 21.04 can't connect to internet when it is emulated with bhyve on my FreeBSD 13

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257798

            Bug ID: 257798
           Summary: Ubuntu 21.04 can't connect to internet when it is
                    emulated with bhyve on my FreeBSD 13
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: marietto2008@gmail.com

Created attachment 227149
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=227149&action=edit
On the text file called pics there are the links of the attached pics.

Hello.

I think that you are a very kind person and I hope that you can help me,because
I've configured the network stack of bhyve like u see below,but ubuntu VM can't
connect to the internet.

1) on /etc/rc.conf

gateway_enable="YES"

2) sysctl net.inet.ip.forwarding=1


and then,on the konsole :

root@marietto:/home/marietto # kldload vmm

kldload: can't load vmm: module already loaded or in kernel

root@marietto:/home/marietto # ifconfig tap0 create up

root@marietto:/home/marietto # ifconfig bridge0 create up

root@marietto:/home/marietto # ifconfig bridge0 addm em0
ifconfig: BRDGADD em0: File exists

root@marietto:/home/marietto # ifconfig bridge0 addm tap0

root@marietto:/home/marietto/Desktop/Files/Bhyve/bhyve # ifconfig

em0: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
options=4810099<RXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWFILTER,NOMAP>
ether e0:d5:5e:e2:1f:22
inet 192.168.1.6 netmask 0xffffff00 broadcast 192.168.1.255
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
inet 127.0.0.1 netmask 0xff000000
groups: lo
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
ether 58:9c:fc:10:ff:b7
id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
member: tap0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
       ifmaxaddr 0 port 5 priority 128 path cost 2000000
member: em0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
       ifmaxaddr 0 port 1 priority 128 path cost 2000000
groups: bridge
nd6 options=9<PERFORMNUD,IFDISABLED>

vm-public: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
ether fe:40:5d:c8:de:75
id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
groups: bridge vm-switch viid-4c918@
nd6 options=9<PERFORMNUD,IFDISABLED>

tap0: flags=8903<UP,BROADCAST,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=80000<LINKSTATE>
ether 58:9c:fc:10:ff:8e
groups: tap
media: Ethernet autoselect
status: no carrier
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

bhyve -c 4 -m 8G -w -H \
        -s 0,hostbridge \
        -s 4,virtio-blk,/mnt/da1p1/vms/os/ubuntu-budgie-gpu/ubuntu-2104-gpu.img
\
        -s 5,virtio-net,tap0 \
        -s 29,fbuf,tcp=0.0.0.0:5900,w=1440,h=900,wait \
        -s 30,xhci,tablet \
        -s 31,lpc -l com1,stdio \
        -l bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd \
        -s 6,hda,play=/dev/dsp8,rec=/dev/dsp8 \
        vm0

As you can see from the pictures that I have attached,the audio works (at least
I can see the audio volume),but the Ubuntu VM can't connect to the internet.
Can you help me a little bit to understand why ? I don't understand if there is
a problem with FreeBSD or with Ubuntu. Anyway,with vm-bhyve the network works
out of the box,there is no need to create the netplan config file. But
unfortunately,with vm-bhyve I don't know how to enable the audio,while with
bhyve it seems that it works.

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