This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-users] Multiple Network Cards + Multiple Bridges on debian len

To: Alexander Pirsig <alex@xxxxxxxxxx>
Subject: Re: [Xen-users] Multiple Network Cards + Multiple Bridges on debian lenny
From: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Date: Mon, 31 Aug 2009 13:54:58 +0700
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Sun, 30 Aug 2009 23:55:39 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <4A9B6C5E.8000800@xxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <4A9AFD72.9050807@xxxxxxxxxx> <20090830231420.GA32451@xxxxxxxxxxxxxxxxxxx> <4A9B6C5E.8000800@xxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
On Mon, Aug 31, 2009 at 1:23 PM, Alexander Pirsig<alex@xxxxxxxxxx> wrote:

> Bridge config on Dom0 looks like this:
> xenbr1          8000.001b213b8a69       no              eth1
>                                                       vif6.0

> Yesterday I discovered that sometimes during Highload on DomU's part of the
> network is hard rechable with ssh or connections stalls even if I try to
> connect to dom0 with has seperate uplink.

There was a thread on this list sometime ago, regarding iptables. Do
you have /proc/net/ip_conntrack on dom0? Does the number of lines
close to /proc/sys/net/ipv4/netfilter/ip_conntrack_max?

> checking arp sometimes shows strange information (during highload) like:
> arp -na
> ? ( at 00:1b:21:3b:8a:68 [ether] on eth0
> ? ( at 00:1b:21:3b:8a:68[ether] on xenbr1
> So my question are:
> 1. Is it normal that bridge xenbr1 claims ip mac address of eth1?


> 2. Do I have to reset mac address on the bridge (xenbr1) or network
> interface (eth1) to FF:FF:FF:FF bevor starting it.

Not really. Your standard bridge setup using OS init scripts should
work. That's what I use, with RHEL.

> 3. What could cause the problem with the arp table?
> 4. Do I have to turn of  arp/multicast on eth1 or xenbr1 like this ->
>   ip link set xenbr1 arp off
>   ip link set xenbr1 multicast off

I'm not sure about these two. I don't arp and multicast use their
default settings on RHEL, YMMV.
Since you mention "high load" I suspect it has something to do with
iptables connection tracking.

I wonder about your vif-script though. Why do you have it commeted
out? Which vif-script did you use?
# (vif-script vif-bridge)


Xen-users mailing list