[ovirt-users] routing

[Justin Zygmont]

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:ehaas at redhat.com]
Sent: Sunday, May 6, 2018 7:34 AM
To: Justin Zygmont <jzygmont at proofpoint.com>
Cc: users at 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 <jzygmont at proofpoint.com<mailto:jzygmont at 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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