Hi I am using virt-manager and created bridge at host . My host nw interfaces is auto br0 iface br0 inet static address x.x.x.178 network x.x.x.0 netmask x.x.x.x broadcast gateway x.x.x.x[gateway of eth0 earlier] bridge_ports eth0 bridge_fd 0 bridge_hello 2 bridge_maxage 12 bridge_stp off #dns-search google.com dns-nameservers x.x.x.x x.x.x.x with this config 1] net inside host is working 2]net inside vms created using nat is working but i have to manually ser interface file inside the NATD vm. 3] when i create virtualnetwork in routed mode using shared physical device br0 and assign vm to it the net inside vm not working . 4] created virtual network using only routed mode with any physical device instaead og br0 still net inside vm not working. I followed documentation on libvirt site . I want vms indifferent nw should communicate with each other like net1 and vm1 can ping vm2 in net2 .