[Users] oVirt 3.3/F19 - Windows guest unable to access network

Fri Sep 20 11:11:05 UTC 2013

fre 2013-09-20 klockan 10:50 +0000 skrev SULLIVAN, Chris (WGK):

Hi,

Just following up on this issue. Turns out the network problems were being caused by the bond0 interface.

The initial configuration was two NICs teamed as bond0, which was then bridged to the ovirtmgmt interface. With this configuration, RHEL guests could access the network normally but Windows guests (XP, 7, 2008 R2) could not. After deactivating the bond0 interface and bridging one of the NICs directly to the ovirtmgmt interface, both RHEL and Windows guests have fully functioning networks.

I am not sure why exactly the bond0 interface was not working as intended. The initial configuration had the mode as balance-rr, is this known to cause problems? My intention was to have the mode as balance-alb however the bonding driver in F19 seems to completely ignore any BONDING_OPTS settings in the ifcfg-bond0 file. Attempts to change the bonding mode directly via /sys/class/net/bond0/bonding/mode repeatedly failed due to 'the bond having slaves', even after the bond had been taken down via ifconfig. I was not able to remove the bond0 definition either, even after removing the ifcfg-bond0 file and the modprobe.d alias.

Is there a recommended/tested bonding configuration HOWTO for oVirt on F19?

Well, for what it´s worth, here´s our ifcfg-bond0:
DEVICE="bond0"
NM_CONTROLLED="no"
USERCTL="no"
BOOTPROTO="none"
BONDING_OPTS="mode=4 miimon=100"
TYPE="Ethernet"

And we also have VLAN-interfaces on top of that, and then bridges on top of them, and no issues so far.

Found the mode-definitions at "http://www.linuxhorizon.ro/bonding.html":
mode=0 (balance-rr)
Round-robin policy: Transmit packets in sequential order from the first available slave through the last. This mode provides load balancing and fault tolerance.

mode=1 (active-backup)
Active-backup policy: Only one slave in the bond is active. A different slave becomes active if, and only if, the active slave fails. The bond's MAC address is externally visible on only one port (network adapter) to avoid confusing the switch. This mode provides fault tolerance. The primary option affects the behavior of this mode.

mode=2 (balance-xor)
XOR policy: Transmit based on [(source MAC address XOR'd with destination MAC address) modulo slave count]. This selects the same slave for each destination MAC address. This mode provides load balancing and fault tolerance.

mode=3 (broadcast)
Broadcast policy: transmits everything on all slave interfaces. This mode provides fault tolerance.

mode=4 (802.3ad)
IEEE 802.3ad Dynamic link aggregation. Creates aggregation groups that share the same speed and duplex settings. Utilizes all slaves in the active aggregator according to the 802.3ad specification.

HTH!

/Karli

Joop: Responses as follows:
 - Windows firewall was disabled in each Windows VM
 - Changing the CPU setting and starting the VM directly on the host via QEMU (i.e. not through oVirt) did not seem to affect the behavior

Thanks,

Chris

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-----Original Message-----
From: users-bounces at ovirt.org<mailto:users-bounces at ovirt.org> [mailto:users-bounces at ovirt.org] On Behalf Of users-request at ovirt.org<mailto:users-request at ovirt.org>
Sent: Thursday, September 19, 2013 3:31 PM
To: users at ovirt.org<mailto:users at ovirt.org>
Subject: Users Digest, Vol 24, Issue 93

------------------------------

Message: 3
Date: Thu, 19 Sep 2013 09:13:43 +0200
From: noc <noc at nieuwland.nl<mailto:noc at nieuwland.nl>>
Cc: "users at ovirt.org<mailto:users at ovirt.org>" <users at ovirt.org<mailto:users at ovirt.org>>
Subject: Re: [Users] oVirt 3.3/F19 - Windows guest unable to access
        network
Message-ID: <523AA427.2060605 at nieuwland.nl<mailto:523AA427.2060605 at nieuwland.nl>>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

On 18-9-2013 23:08, SULLIVAN, Chris (WGK) wrote:
>
> Hi,
>
> I'm having network issues with a Windows Server 2008 R2 guest running
> on an F19 host. The guest has a static configuration and is able to
> ping itself and the host it is running on, however cannot ping the
> gateway, any other hosts on the local network, or external hosts. A
> RHEL 6.4 guest on the same host with a similar static configuration
> works normally.
>
> Iptables/firewalld on the host are switched off and the network
> definitions in the XML for each VM (Windows/RHEL) are the same. The
> virtio network drivers are installed in the guest. The guest was
> created from a Win 2008 R2 template, which was created from a VM
> imported from oVirt 3.2. Software versions below.
>
Just to be sure, iptables/firewalld!=Windows Firewall. Is there a rule
in the windows firewall to allow ping or is it disabled?

> Are there any manual configuration steps required on the host to
> support Windows guests? Are there any particular diagnostic steps I
> could take to try and narrow down the cause?
>
Don't think so, just converted a Windows2008R2 datacenter guest from
Vmware to oVirt and it ran, after adding virtio drivers or using e1000
and/or ide disks.

> Versions:
>
> -oVirt 3.3.0-4
>
> -F19 3.10.11-200
>
> -QEMU 1.4.2-9
>
> -Libvirt 1.1.2-1
>
> -VDSM 4.12.1-2
>
> -virtio-win 0.1-52
>
>
Your problem looks like the problem Ren? had with his Solaris guest, its
a recent thread. Turned out that setting -cpu Nehalem by ovirt caused
networking in the Solaris guest to fail.
Don't think this is your problem though since lots of people run Windows
guest without problems.

Regards,

Joop

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Swedish University of Agricultural Sciences
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