Hello, I am running Ovirt 3.6.1 on CentOS 7.1 in a single server, hosted engine setup. I have created 10 dummy dummy interfaces names 'dummy_[0-9]'. Ovirt sees them, and in "Networks" for my cluster, I created 10 10 "internal" networks called 'Internal_[0-9]'. In the "Hosts" tab, in the "Network Interfaces" tab for my host, I assigned the 'dummy_*' interfaces tot he appropriate 'Internal_*' network (i.e., dummy_0 -> Internal_0, dummy_1 -> Internal_1, etc.) I have create two VMs and assigned a NIC interface on each attached to the 'Internal_0' network. I gave the interfaces on the gusts an IP int he same subnet, but they cannot talk to each other. When I try to ping one from the other, here is the response I get (public IPs redacted): --- START --- C:\Users\Administrator>ping 192.168.100.12 Pinging 192.168.100.12 with 32 bytes of data: Reply from 192.168.100.20: Destination host unreachable. Reply from XX.XXX.XX.XX: TTL expired in transit. Request timed out. Reply from XX.XXX.XX.XX: TTL expired in transit. Ping statistics for 192.168.100.12: Packets: Sent = 4, Received = 3, Lost = 1 (25% loss), --- END --- The IP of the PC I am pinging from is '192.168.100.20' I have been able to setup internal networks like this before, but seem to be missing something and I am not sure what? Here is what the dummy_0 interface shows when I run 'ip addr show': --- START --- 7: dummy_0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master Internal_0 state UNKNOWN link/ether 0e:a2:6b:54:1a:91 brd ff:ff:ff:ff:ff:ff --- END --- and Internal_0 looks like this: --- START --- 20: Internal_0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 0e:a2:6b:54:1a:91 brd ff:ff:ff:ff:ff:ff inet6 fe80::dc07:84ff:fe1b:60cb/64 scope link valid_lft forever preferred_lft forever --- END --- I am not sure what other info you need, so please do let me know. I did see this: <http://blog.duderamos.com/internal-isolated-networks-on-ovirt/> and except that I use 'dummy_*' instead of 'dummy*', my setup is the same. Thanks, in advance, for your help on this. Regards, Alan