From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Friesen Subject: bonding and SR-IOV -- do we need arp_validation for loadbalancing too? Date: Tue, 24 Jul 2012 09:57:03 -0600 Message-ID: <500EC5CF.3080400@genband.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: netdev , Jay Vosburgh , andy@greyhouse.net Return-path: Received: from exprod7og127.obsmtp.com ([64.18.2.210]:56828 "EHLO exprod7og127.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754916Ab2GXP5k (ORCPT ); Tue, 24 Jul 2012 11:57:40 -0400 Sender: netdev-owner@vger.kernel.org List-ID: Hi all, We've been starting to look at bonding VFs from separate physical devices in a guest, but we've run into a problem. The host is bonding the corresponding PFs, and it uses arp monitoring. What we have found is that any broadcast traffic from the guest (if they enable arp monitoring, for example) will be seen by the internal L2 switch of the NIC and sent up into the host, where the bonding driver will count it as incoming packets and use it to mark the link as good. The only solutions I've been able to come up with are: 1) add arp validation for load balancing modes as well as active-backup. 2) put all the VMs in VLANs Anyone have any better ideas? Chris -- Chris Friesen Software Designer 3500 Carling Avenue Ottawa, Ontario K2H 8E9 www.genband.com