Unable to use Routed (brouter) method with netmask 255.255.255.255 in both host and vm

Hello- Assuming I have the host /etc/network/interfaces in Debian Bullseye as follows: ----------------------------------------------------- auto enpXYs0 iface eth0 inet static address mn.opq.rst.xy # Main IP netmask 255.255.255.255 pointopoint (Gateway IP) gateway (Gateway IP) auto virbr0 iface virbr0 inet static address mn.opq.rst.xy #Main IP netmask 255.255.255.255 bridge_ports none bridge_stp off bridge_fd 0 pre-up brctl addbr virbr0 # Additional IP for VM below: only mn.opq octets match main IP up ip route add mn.opq.uw.z/32 dev virbr0 down ip route del mn.opq.uw.z/32 dev virbr0 ---------------------------------------------------- Using the above configuration, ip addr shows the main host IP address as 'peer' with its gateway IP. Please, see: < https://docs.hetzner.com/robot/dedicated-server/network/net-config-debian... What kind of /etc/libvirt/qemu/network/mytestnetwork.xml file should I create for a virtual machine installation connected via libvirtd? Please note that nftables are in use and possibly I should edit its configuration file to add the IP mn.opq.uw.z of the virtual machine and thus enable the VM to utilize the main host IP as a gateway. Currently I have mytestnetwork.xml which contains: <network> <name>mytestnetwork</name> <uuid>char-string</uuid> <forward mode='bridge'/> <bridge name='virbr0'/> </network> The VirtManager GUI advances the installation of the Debian OS in the VM but even if I have provided the main host IP as its gateway IP it cannot fetch the debian packages from its repository, i.e., there is no connection to the outside world. Any insight is appreciated. -- Best Professional Regards. -- Jose R R http://metztli.it --------------------------------------------------------------------------------------------- Download Metztli Reiser4: Debian Buster w/ Linux 5.16.20 AMD64 --------------------------------------------------------------------------------------------- feats ZSTD compression https://sf.net/projects/metztli-reiser4/ ------------------------------------------------------------------------------------------- Official current Reiser4 resources: https://reiser4.wiki.kernel.org/