Hallo @ all, after 3 frustrating days I give up ... I cannot do it without help. I have successfully managed to create a local VM with the virt-manager and also headless via SSH to a NonGui-System .... Debian Buster runs on all systems.
But it was not possbible to me to give the VM a regular LAN-IP, so the VM is a regular LAN client. The VM works only via NAT and in its own subnet to connect to the LAN/WAN. The VM shall work as a FTP-Server, so is has to be connectable from LAN-Clients. I have read 100e HowTos .... either outdated, no longer supported, faulty, fragmented, deprecated, without a "red line", illogical, incomprehensible, incompatible because other distribution, and so on ... that is really a description-disaster ;-) What is the right Way to create a VM, where the VM is a regular LAN- Client in Home-Net at the end and get an IPv4 from DSL-Router as any other physical Client? Thats the way how working my Virtualbox-VMs since a long time, but now I want to migrate to qemu/kvm. Because I want to understand this way, I want to do it manual, so I have disable the defaults: virsh net-autostart default --disable virsh net-destroy default I also don't want do it with netfilter-defaults, because iptables will be set and there starts a conflict with my nftables-firewall. That is the Command to start create the VM: virt-install --connect qemu:///system \ --name vmdeb10 \ --memory 2048 \ --vcpus=2 \ --disk /home/qemu/VMs/vmdeb10.cow2,size=8,format=qcow2 \ --cdrom /Images/firmware-buster-DI-alpha5-amd64-netinst.iso \ --noautoconsole \ --os-type linux \ --os-variant debiantesting \ --hvm \ --graphics vnc,port=5900,listen=0.0.0.0 \ --network=bridge=br0,model=virtio That is my non-customized bridge-Device # ip link add br0 type bridge root@debian-buster:~ # ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever 2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:22:33:44:55:66 brd ff:ff:ff:ff:ff:ff inet 172.100.1.28/24 brd 172.100.1.255 scope global dynamic enp4s0 valid_lft 861990sec preferred_lft 861990sec 6: br0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether 9e:3f:cc:dd:cc:06 brd ff:ff:ff:ff:ff:ff I dont use a network-manager, no /etc/init.d/networking. I start my networking sometimes with ifup@.service, some machines with systemd-networkd and some maschines with my own NWM with iproute2-Commands directly. My preferred way is iproute-commands, because I can start/set all what is needed really easy in booting-time with a systemd-service-unit. What I have to do, so that it will working? I hope, anyone can help me. BTW: of course, I have tried this with the default bridge networksettings too, but the Debian installer "dies" at looking for the mirror, in other words, no network at this point. Thank you in advance and best regards Tom