Thank you for your reply amd advice. I ve tried that, but unfortunately when the vm-router starts on host1 it will only assign IPs toVMs residing on host1. If i migrate the vm-router on host2 it will assign IPs only on Vms residing on host2. And even if i assign IPs manually.. I can ping all the VMs under host1 from a host1 VM, I can ping all the VMs under host2 from a host2 VM. I cannot ping a host2 VM from a host1VM and vice versa. ---- Dominik Holler wrote ---- On Mon, 21 Jan 2019 14:00:14 -0000 adamantini.peratikou(a)ouc.ac.cy wrote: Yes. oVirt's logical networks provides isolation on layer 2. If the switch connection the two hosts does not block this, you can 1. create a new logical network with a vlan tag in oVirt, 2. connect this new logical network to both hosts, ( Compute > Hosts > xxx > Network Interfaces > Setup Host Networks) 3. add a new network interface with network profile of the new logical network to the router/dhcp server VM and 4. use the same logical network for the network interface of the client VMs.

Thank you i try pinging Host1 from Host 2 with the following results: On a logical network Host1 can ping host2 but while on a VLAN host 1 cannot ping host2. The hosts are physically connected via a switch.

Thank you for all the advice. The reason for the issue was the physical switch like you said!! The issue is now fixed. Thanks 😊 On Tue, 22 Jan 2019, 10:04 Dominik Holler <dholler(a)redhat.com wrote: