Re: [Xen-users] Xen creating two bridges

[Gerhard Possler <gerhard.possler@xxxxxxxxxx>]

Hi all,

you may use in the xend-config.sxp

(vif-script vif-bridge bridge=xenb0)


or use scripts:

        brctl
addbr xenintbr
           
    brctl setfd xenintbr 0
           
    brctl sethello xenintbr 0
           
    brctl stp xenintbr off

           
    echo "IP adress of xen bridge is 10.0.0.1"
           
          ifconfig xenintbr 10.0.0.1 netmask 255.255.255.0
up
           
          echo 1 > /proc/sys/net/ipv4/ip_forward

Mit freundlichen Grüßen / with kind regards

Gerhard Possler IT Architect IBM Enterprise Linux Services ELS Wiki@IBM (only accessible via IBM intranet)

IT-Services and Solutions GmbH Rathausstr. 7, D-09111 Chemnitz Geschäftsführung: Rainer Laier, Michael Mai Sitz der Gesellschaft: Chemnitz Registergericht: Amtsgericht Chemnitz, HRB 18409 http://www.itsas.de/

gerhard.possler@xxxxxxxxxx Mobil +49 (0) 160 90578637

"Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Sent by: xen-users-bounces@xxxxxxxxxxxxxxxxxxx

11.01.2008 15:05

To	"Russell Horn" <albanach@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
cc
Subject	Re: [Xen-users] Xen creating two bridges

I've found that I have better luck creating bridges when
I use the bridge facilities built in to Linux instead of the XEN ones.
 For example, on SuSE you can create an /etc/sysconfig/network/ifcfg-xenbr0
file and put configuration directives in this file that tell Linux which
interface(s) to put in the bridge and even assign an IP or set DHCP on
the bridge.  Most of my XEN servers have multiple VLANs - usually
five or six, so I've found that doing this greatly simplifies the amount
of configuration I have to do.
 
-Nick

>>> On 2008/01/10 at 19:51, "Russell Horn" <albanach@xxxxxxxxx>
wrote:
Hi,

I'm trying to set up networking on a new machine.

I'm not getting any networking from the domU's

I notice that I have two bridges being created:

xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500
 Metric:1
          RX packets:3024 errors:0 dropped:0 overruns:0
frame:0
          TX packets:3 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1802480 (1.7 Mb)  TX bytes:258
(258.0 b)

xenbr1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500
 Metric:1
          RX packets:44 errors:0 dropped:0 overruns:0
frame:0
          TX packets:6 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1232 (1.2 Kb)  TX bytes:468
(468.0 b)

Any idea why that would be?

/etc/xen/xend-config.sxp only contains this:

(xend-relocation-server yes)
(xend-relocation-hosts-allow '^localhost$')
(network-script 'network-bridge netdev=eth0')
(vif-script vif-bridge)
(dom0-min-mem 196)
(dom0-cpus 0)

I'm configuring networking for the domU with this line:
vif=[ 'mac=00:16:3e:6a:b4:43', 'bridge=xenbr0' ]

Any idea why I'm seeing two bridges and if that might point to why I'm
not getting any network throughput on my virtual machines?

Thanks,

Russell

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