[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

--- Comment #3 from mario felicioni <marietto2008@gmail.com> ---
now my file /etc/sysctl.conf is like this :

net.link.tap.up_on_open=1
net.inet.ip.forwarding=1

my /etc/rc.conf is like this :

hostname="marietto"
keymap="it.kbd"
ifconfig_em0="DHCP"
local_unbound_enable="YES"
sshd_enable="YES"
powerd_enable="YES"
ntpdate_enable="YES"
ntpd_enable="YES"
ntpd_sync_on_start="YES"
dumpdev="NO"
dbus_enable="YES"
slim_enable="NO"
libvirt_enable="YES"
linux_enable="YES"
linux_mounts_enable="YES"
gateway_enable="YES"
kld_list="fusefs"
lightdm_enable="NO"
sendmail_enable="NO"
microcode_update_enable="YES"
fsck_y_enable="YES"
tcp_drop_synfin="NO"
telnet_enable="NO"
cupsd_enable="NO"
portmap_enable="NO"
rlogin_enable="NO"
inetd_enable="NO"
webcamd_enable="NO"
samba_enable="NO"
lpd_enable="NO"
winbindd_enable="NO"
nfs_server_enable="NO"
nfs_client_enable="NO"
vm_enable="YES"
vm_dir="/mnt/da1p1/vms/os/"
bastille_enable="YES"
cloned_interfaces="lo1"
ifconfig_lo1_name="bastille0" 
vboxnet_enable="YES"
devfs_system_ruleset="system"
cloned_interfaces="bridge0"
ifconfig_bridge0="addm em0 up"

my /boot/load.conf is like this :

vmm_load="YES"
nmdm_load="YES"
if_tap_load="YES"
if_bridge_load="YES"
fusefs_load="YES"
linprocfs_load="YES"
linsysfs_load="YES"
tmpfs_load="YES"
verbose_loading="YES"
vboxdrv_load="YES"
console=vga,com1
boot_multicons="YES"
boot_serial="YES"
console="comconsole,vidconsole"

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