Hi all, I created a two node cluster that manages virtual machines with two servers connected via a cross cable on the network 10.0.0.0/24. I want that machines that runs on different servers in the network 172.16.0.0/24 can see all the others. To make this possible I've configured a vlan on each server: ... ... 5: eth1.111@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 5c:d9:98:b1:4c:4d brd ff:ff:ff:ff:ff:ff inet 172.16.0.0/24 brd 172.16.0.255 scope global eth1.111 inet6 fe80::5ed9:98ff:feb1:4c4d/64 scope link valid_lft forever preferred_lft forever ... ... And created a "lan" network, via virsh: <network> <name>lan</name> <uuid>8ac034c8-553d-b995-5a80-c1c711cb088c</uuid> <forward dev='eth1.111' mode='route'/> <bridge name='virbr1' stp='on' delay='0' /> <ip address='172.16.0.2' netmask='255.255.255.0'> </ip> </network> but with this setup "lan" never comes up because, for some reason, the network is locked: # virsh net-start lan error: Failed to start network lan error: internal error Network 172.16.0.1/255.255.255.0 is already in use by interface eth1.111 What is not clear to me is why, if I turn down the eth1.111 device, start the lan network, turn eth1.111 up and then force the brctl addif command, everything works: # ifdown eth1.111 Removed VLAN -:eth1.111:- # virsh net-start lan Network lan started # ifup eth1.111 Set name-type for VLAN subsystem. Should be visible in /proc/net/vlan/config Added VLAN with VID == 111 to IF -:eth1:- # brctl addif virbr1 eth1.111 # brctl show bridge name bridge id STP enabled interfaces br0 8000.6c626dd7518e no eth0 virbr0 8000.000000000000 yes virbr1 8000.5cd998b14c4d yes eth1.111 Why manually is possible to make things work? What am I ignoring? Thanks a lot, -- RaSca Mia Mamma Usa Linux: Niente è impossibile da capire, se lo spieghi bene! rasca@miamammausalinux.org http://www.miamammausalinux.org