Dear list, I am trying to create an access port on a VM to connect to VLAN (20 in my case). I am pretty sure my router and switch are setup correctly. I can assign my host machine (hypervisor) an IP address on either VLAN1 or VLAN20 by changing the configuration; in other words, it is connected to the switch via a trunk port. The host machine runs on Debian 12, has ifupdown2 installed, 8021q module is loaded at boot and its /etc/network/interfaces file reads as follows: auto lo iface lo inet loopback # bond interface auto bond0 iface bond0 inet manual bond-slaves enp5s0 enp6s0 bond-mode 802.3ad bond-xmit-hash-policy layer2+3 bond-miimon 100 bond-lacp-rate 1 bond-vlan-aware yes bond-vids 2-500 # vlan 1 auto bridge0.1 iface bridge0.1 inet static address 192.168.1.130/24 gateway 192.168.1.1 # bridge interface auto bridge0 iface bridge0 inet manual bridge-ports bond0 bridge_stp on bridge_fd 2 bridge_maxwait 0 bridge-vlan-aware yes bridge-vids 2-500 source-directory /etc/network/interfaces.d EOF The host gets an IP address of 192.168.1.130 from VLAN1, as intended, by these settings. VM1 (also Debian 12) is connected to bridge0, which is designed as a trunk bridge, and CAN get an IP address in the 192.168.1.0/24 network (aka VLAN1), but CANNOT get an IP address in the 192.168.20.0/24 network 9aka VLAN20). VMs network interface is named as enp1s0 and I tried creating an interface named enp1s0.20 in its own /etc/network/interfaces file without any change in behavior. It just does not connect to VLAN20, no matter what I tried. What am I missing? I am very thankful for the pointers, and will be happy to provide further information, try recommended settings and report back. Best!