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From Daan Hoogland <>
Subject Re: dual NIC VLAN configuration
Date Fri, 25 Jul 2014 07:47:08 GMT
Ian, I would imagine that guest traffic can't go out to the net this
way. Maybe you should swap them. This is only guessing however. What
are you seeing?

On Fri, Jul 25, 2014 at 2:00 AM, Ian Young <> wrote:
> Here's the less verbose version:  My hypervisor has two NICs and I've set
> up a label on each.  Traffic to and from cloudbr0 works perfectly.  Traffic
> going into cloudbr1 goes out cloudbr0 because that interface has a default
> gateway.  Will this pose a problem when I try to set up separate management
> and guest networks in CloudStack?
> On Thu, Jul 24, 2014 at 10:56 AM, Ian Young <> wrote:
>> I am trying to set up a server with two NICs as a hypervisor.  I would
>> like to use the two interfaces to separate management and guest traffic, as
>> recommended by the CloudStack installation guide.  This server is connected
>> to a managed switch, which is connected to a hardware firewall, both of
>> which are set up with tagged VLANs.  Some of the ports on the switch are
>> designated as VLAN 6 and some are VLAN 7.  I've confirmed the VLANs are set
>> up correctly by configuring eth0 and eth1 (one at a time) with the
>> appropriate IP address, netmask, and gateway.
>> However, the difficulty arises when I try to configure both interfaces
>> simultaneously.  The return traffic tends to go out whichever interface is
>> associated with the default gateway, a typical issue when using multiple
>> network interfaces.  I've followed numerous guides, which all basically say
>> the same thing:  Don't set a default gateway; use iproute2 to control the
>> flow of traffic with route-eth0, rule-eth0, and rt_tables.  I've tried
>> setting this up numerous times to no avail, probably because the guides I'm
>> reading don't involve VLANs.  Add to that the the cloudbr0 and cloudbr1
>> bridges that CloudStack requires and now I'm really confused as to how to
>> set up the network.  I can't be the first person to have set up CloudStack
>> this way; it sounds pretty common.  Can someone explain to me the correct
>> way to configure these interfaces?
>> Here is my network information:
>> VLAN 6 (management)
>> gateway:
>> VLAN 7 (guest)
>> gateway:
>> current hypervisor settings:
>> eth0:
>> eth1:
>> current management server settings (this is a separate machine):
>> p4p1:


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