On Xen ; two vifs network interfaces are produced but no IP number is assigned and they are deleted after some minutes.

Hello.

I'm trying to boot Windows 10 (builder hvm) with the xen-hypervisor on Ubuntu 20.04. This is what I did in order to be able to do this :

1) before to create the vm,I run this script :

ip.sh

ifconfig xenbr0 192.168.200.12
ifconfig xenbr0 hw ether 22:61:34:00:00:01

these commands produce a network interface like this :

xenbr0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.200.12 netmask 255.255.255.0 broadcast 192.168.200.255
inet6 fe80::64ec:feff:fe7b:9a16 prefixlen 64 scopeid 0x20<link>
ether 22:61:34:00:00:02 txqueuelen 1000 (Ethernet)
RX packets 4 bytes 1700 (1.7 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 137 bytes 29385 (29.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

2) I run also this script :

#!/bin/bash

sudo /etc/init.d/xencommons start
sudo /etc/init.d/xendomains start
sudo /etc/init.d/xen-watchdog start
sudo /etc/init.d/xendriverdomain start

3) this is my xenwin.cfg conf file :

#kernel = "/usr/lib/xen-4.11/boot/hvmloader"
builder = 'hvm'
#vif = [ 'type=ioemu,bridge=xenbr0,ip=assigned-ip,mac=22:61:34:00:00:01' ]
vif = [ 'type=ioemu,bridge=xenbr0,ip=192.168.100.12,mac=22:61:34:00:00:01' ]
address = '192.168.100.12'
#address = 'assigned-ip'
netmask = '255.255.255.0'
memory = 8192
# shadow_memory = 64
name = "windows-10" # domain prefix name
# cdrom = 'file:/xen/Windows.iso' # name of iso image you created above
# disk = [ 'file:/xen/xenwin.img,hdc,w', 'file:/xen/Windows.iso,hdb:cdrom,r' ]
# disk = [ 'phy:/dev/sdb,ioemu:hdb,w' ]
disk = [ 'phy:/dev/sdb,ioemu:sdb,w' ]
#device_model = '/usr/lib/xen-default/bin/qemu-dm'

# boot on floppy (a), hard disk (c) or CD-ROM (d)
# default: hard disk, cd-rom, floppy
#### boot must be dc to install windows after that you change it to c or cd
# boot = "dc"
boot = "c"

# vnc = 1 # use VNC to insall and setup windows after that is done you can disable this
# vncconsole = 0
vncpasswd = 'mario'
# vncviewer = 1
# vncunused = 1
# vnclisten = 'Domain-0 IP'
vcpus = 6 # number of cpu's to assign
stdvga = 0
serial = 'pty'
usbdevice = 'tablet' # Required for USB mouse
on_poweroff = 'destroy'
on_reboot = 'destroy'
on_crash = 'destroy'

at this point,I create the vm with this command : xl create xenwin.cfg

two new network interfaces are produced,like these :

vif1.0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether fe:ff:ff:ff:ff:ff txqueuelen 32 (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

vif1.0-emu: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::fcff:ffff:feff:ffff prefixlen 64 scopeid 0x20<link>
ether fe:ff:ff:ff:ff:ff txqueuelen 1000 (Ethernet)
RX packets 4 bytes 1756 (1.7 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 33 bytes 5325 (5.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

they don't have an IP number and they are deleted after some minutes. This is what I see between the processes :

root@ziomario-I9:/etc/xen# ps ax | grep avahi

1779 ? Ss 0:00 avahi-daemon: running [ziomario-I9.local]
1911 ? S 0:00 avahi-daemon: chroot helper
4227 ? S 0:00 avahi-autoipd: [xenbr0] sleeping
4228 ? S 0:00 avahi-autoipd: [xenbr0] callout dispatcher

I don't understand why they don't get any IP.