Thanks for the reply,

Ok I see what you’re saying, its just confusing because there are several 
places that mention the gateways and none of them are clear on what they’re 
doing.
For example, under Cluster > Networks > Manage Networks,  default route is only 
selectable for 1 network, yet in each network you create there is still the 
option of choosing a IP address and gateway.

Even if I don’t put in any IP or gateway for a tagged vlan, it still depends of 
the management gateway to forward to the router.  I thought I should be able to 
lose the management network and still have all the tagged vlans working?



From: Edward Haas [mailto:eh...@redhat.com]
Sent: Sunday, May 6, 2018 7:34 AM
To: Justin Zygmont <jzygm...@proofpoint.com>
Cc: users@ovirt.org
Subject: Re: [ovirt-users] routing

Not sure if I understand what you are asking here, but the need for a gateway 
per network has emerged from the need to support other host networks (not VM 
networks) beside the management one.
As an example, migration and storage networks can be defined, each passing 
dedicated traffic (one for storage communication and another for VM migration 
traffic), they may need to pass through different gateways.
So the management network can be accessed using gateway A, storage using B and 
migration using C. A will usually be set on a host level as the host default 
gateway, and the others will be set for the individual networks.
Otherwise, how would you expect storage to use a different router (than the 
management one) in the network?
Thanks,
Edy.

On Thu, May 3, 2018 at 1:08 AM, Justin Zygmont 
<jzygm...@proofpoint.com<mailto:jzygm...@proofpoint.com>> wrote:
I don’t understand why you would want this unless the ovirtnode itself was 
actually the router, wouldn’t you want to only have an IP on the management 
network, and leave the rest of the VLANS blank so they depend on the router to 
route the traffic:

NIC1  -> ovirt-mgmt  - gateway set
NIC2  -> VLAN3, VLAN4, etc…


https://www.ovirt.org/documentation/admin-guide/chap-Logical_Networks/<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ovirt.org_documentation_admin-2Dguide_chap-2DLogical-5FNetworks_&d=DwMFaQ&c=Vxt5e0Osvvt2gflwSlsJ5DmPGcPvTRKLJyp031rXjhg&r=FiPhL0Cl1ymZlnTyAIIL75tE4L0reHcDdD-7wUtUGHA&m=lvMQTxxtMmO0n6usZZCFu7YpsCTkH0c0sLWerugBDGo&s=MDRHWiynqsCFNQ5_p0hyRdgEgBE8A9n3XCv7Ml8_HdU&e=>

Viewing or Editing the Gateway for a Logical Network
Users can define the gateway, along with the IP address and subnet mask, for a 
logical network. This is necessary when multiple networks exist on a host and 
traffic should be routed through the specified network, rather than the default 
gateway.
If multiple networks exist on a host and the gateways are not defined, return 
traffic will be routed through the default gateway, which may not reach the 
intended destination. This would result in users being unable to ping the host.
oVirt handles multiple gateways automatically whenever an interface goes up or 
down.



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