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I am trying to run VMs (and Pools) into a NAT. To reach this target I have:

  • created a new Network in the Cluster;
  • checked "Create on external provider" check box;
  • selected ovirt-provider-ovn;
  • entered (in the "Subnet" tab) Name, CIDR, gateway and DNS.
  • assigned the network to a VM

When I run the VM, it is correctly getting the subnet IP, but it is completely isolated. Cannot either ping the Gateway or the DNS server.

What am I missing?

Fabio Marzocca
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1 Answers1

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As per RHV 4.3 documentation, you can only create isolated OVN networks through oVirt API or routed OVN networks through Neutron API. Source NAT is not (yet) implemented

If you add Open Virtual Network (OVN) (ovirt-provider-ovn) as an external network provider, multiple subnets can be connected to each other by routers. To manage these routers, you can use the OpenStack Networking API v2.0. Please note, however, that ovirt-provider-ovn has a limitation: Source NAT (enable_snat in the OpenStack API) is not implemented.

source: https://red.ht/33V7ObK

Stefano Stagnaro
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  • Thank you Stefano. So, no way to have a Source NAT for VMs in oVirt? Maybe using external services/devices/hardware? – Fabio Marzocca Oct 23 '19 at 20:11
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    Just provision a VyOS vm between OVN network and the logical network and then simply configure source NAT https://vyos.readthedocs.io/en/latest/nat.html It won't be strictly SDN but it will works. – Stefano Stagnaro Oct 24 '19 at 23:35