Hi Martin,

  oVirt 4.1 (and maybe earlier versions that I just didn't notice) use policy based routing.  You can see these routes by typing "ip rule show" on one of the hosts.

  In situations such as yours, where you are connected to multiple networks and need to specify which one has the gateway, there is a little trick you need to use on the admin box (usually the hosted engine VM, it' sthe same box that runs the GUI)  ssh into that box and then run the following two commands:

  engine-config -g UserDefinedNetworkCustomProperties
  engine-config -s UserDefinedNetworkCustomProperties='default_route=^(true|false)$'

Next, go into the GUI and onto the Hosts tab.  Click on your first host then on the Network Interfaces tab, and "Setup Host Networks"  Click on the little pencil icon next to your VM network (the one that should have the default route) and then on the Custom Properties tab.  Add the property "default_route" and set it to true and hit OK.  Then click on all of the other networks you have and add the same property with the value of false.  Then hit OK to save the network config.  Repeat this process for all hosts.

Note that I think when I did this I had a problem getting it to save for the host that was running the HostedEngine.  You may have to put each host into Maintenance Mode in order to apply the setting.

This bug has some more details on the setup I think: https://bugzilla.redhat.com/show_bug.cgi?id=1400366



On 2017-04-30 09:00 AM, users-request@ovirt.org wrote:

Message: 1
Date: Sun, 30 Apr 2017 13:03:28 +0200
From: martin chamambo <chamambom@gmail.com>
To: Yaniv Kaul <ykaul@redhat.com>
Cc: users <users@ovirt.org>
Subject: Re: [ovirt-users] how does ovirt deal with multiple networks
        with multiple gateways
Message-ID:
        <CAHbWOdZRBsTuqWKTzU6Aa4e=e1RXH30fQpg58dT3mOVWZgVAKg@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

I am using ovirt 4.1.1.X.X  version on both nodes and Engine.
There are no static routes and the network topology is is such a way that
only the VMnetwork logical network is on a network with internet and has
got  a default gateway .

so i have
192.168.1.X  with a gateway of say 192.168.1.50 (This has internet) and
this is the VM network
  192.168.2.X , no gateway and is the ovirtmangnt
192.168.3.X  no gateway and its the display
,192.168.4.X , no gateway and its the Migration network
192.168.5.X , no gateway and its the Storage

when i set up these networks using the Ovirt engine GUI , ovirt seems to
create routes and rule files for each specific network ,but for some reason
, i cant ping anything besides the networks defined

On Sun, Apr 30, 2017 at 8:45 AM, Yaniv Kaul <ykaul@redhat.com> wrote:

Can you share some more details?
- What version are you using?
- What is the network topology? Are any static routes defined? The fact
oVirt sets a specific network for storage does not imply it'll use it for
storage automatically - unless routing is properly defined for it.

TIA,
Y.

On Sun, Apr 30, 2017 at 8:11 AM, martin chamambo <chamambom@gmail.com>
wrote:

Hello

I am testing ovirt and i have configured it with 5 networks as shown
below

Display , Migration , VMnetwork ,Storage and the default ovirtmngmnt
network

These networks are represented by individual phyiscal interfaces on the
ovirt nodes and for some reason the default gateway is not being set
correctly

it always seem to prefer the ovirtmngmnt interface as the default

The only network thats supposed to have internet is the VMnetwork role


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