How to connect a qemu / kvm mac os x guest os to internet inside WSL2

Hello.

I've installed ubuntu 20.04 on WSL2 and I started a VM with qemu and kvm,running mac os x as guest os. It works great,except for the configuration of the net. Infact it is not able to connect to internet. Sometime from WSL I get a 192.x.x.x ip number,like :

192.168.69.65 ; 192.168.71.185 ; 192.168.73.223 ; 192.168.69.33 ; 192.168.100.101

sometime I get a 172.x.x.x ip address,like : 172.22.250.54 ; 172.22.253.128 ; 172.21.138.120 ; 172.22.88.142.

The vEthernet (WSL) adapter on Windows 10 is configued like this : 172.26.80.1 as IP address,subnet mask = 255.255.240.0

I have created a bridge in WIndows 10,between my Intel ethernet adapter and the tap0 / Tap-windows. It's IP is 192.168.1.6 ; subnet mask = 255.255.255.0 ; gateway = 192.169.1.1 ; dns primary = 8.8.8.8

I have configured WSL like it is explained,but it didn't work. Check below what happens :

Code:

root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# brctl addbr br0
root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# ip addr flush dev eth0
root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# brctl addif br0 eth0

root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# tunctl -t tap0 -u root
Set 'tap0' persistent and owned by uid 0

root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# brctl addif br0 tap0
root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# ifconfig eth0 up
root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# ifconfig tap0 up
root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# ifconfig br0 up

root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.00155d99cfa4 no eth0
tap0

root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# dhclient -v br0

Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit ISC DHCP - Internet Systems Consortium

Listening on LPF/br0/00:15:5d:99:cf:a4
Sending on LPF/br0/00:15:5d:99:cf:a4
Sending on Socket/fallback
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 3 (xid=0xbbd3b615)
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 8 (xid=0xbbd3b615)
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 12 (xid=0xbbd3b615)
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 11 (xid=0xbbd3b615)

root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# ifconfig

br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::215:5dff:fe99:cfa4 prefixlen 64 scopeid 0x20
ether 00:15:5d:99:cf:a4 txqueuelen 1000 (Ethernet)
RX packets 172 bytes 43127 (43.1 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 16 bytes 2304 (2.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 00:15:5d:99:cf:a4 txqueuelen 1000 (Ethernet)
RX packets 543 bytes 121055 (121.0 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 28 bytes 3280 (3.2 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

tap0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 46:88:cb:85:5f:9e txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

root@DESKTOP-N9UN2H3:/mnt/c/Android/sdk/platform-tools# ping Google
ping: Google Name or service not known

I think IPv4 issue can be solved with configuring DHCP, but I don't know how to do that. I dont know why after removing address from eth0, which had an ipv4 address, and creating a bridge,it becomes no ipv4.