Re: [Xen-users] dummy interfaces on a bridge?

["Chris Fanning" <christopher.fanning@xxxxxxxxx>]

Hi,

Well, I'm ready to try this and here are my first problems.
the box already has two physical nic. eth0 and eth1. these work fine.

*****************************
So I do on dom0:

/etc/network/interfaces
auto dummy0
iface dummy0 inet static
       address 192.168.6.1
       netmask 255.255.255.0
       network 192.168.6.0
       broadcast 192.168.6.255

/etc/xen/scripts/my-network-bridge
#!/bin/bash
case "$1" in
       start)
               /etc/xen/scripts/network-bridge start bridge=xenbr0
netdev=eth0 vifnum=0 antispoof=no
               /etc/xen/scripts/network-bridge start bridge=xenbr1
netdev=eth1 vifnum=1 antispoof=no
               /etc/xen/scripts/network-bridge start bridge=xenbr2
netdev=dummy0 vifnum=2 antispoof=no
       ;;
       stop)
               /etc/xen/scripts/network-bridge stop bridge=xenbr0
netdev=eth0 vifnum=0
               /etc/xen/scripts/network-bridge stop bridge=xenbr1
netdev=eth1 vifnum=1
               /etc/xen/scripts/network-bridge stop bridge=xenbr2
netdev=dummy0 vifnum=2
       ;;
       restart)
               $0 stop
               $0 start
       ;;
       *)
       echo "usage: $0 {start|stop|restart}"
esac
exit 0


/etc/xen/desktopU
kernel = "/boot/vmlinuz-2.6.16-xen"
ramdisk = "/boot/initrd-xen-3.0.2-2.img"
memory = 700
name = "desktopU"
vcpus = 2

disk = ['phy:/dev/sdc1,hda1,w','phy:/dev/sdb5,hda2,w']
root = "/dev/hda1 ro"
extra = "4"
vif = ['bridge=xenbr0','bridge=xenbr1','bridge=xenbr2']


*****************************
and on domU

/etc/network/interfaces
auto dummy0
       iface dummy0 inet static
       address 192.168.6.2
       netmask 255.255.255.0
       network 192.168.6.0
       broadcast 192.168.6.255
       # I've also tried addind "bridge_ports xenbr2"
********************

on dom0
#brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              vif2.0
                                                       peth0
                                                       vif0.0
xenbr1          8000.feffffffffff       no              vif2.1
                                                       peth1
                                                       vif0.1
xenbr2          8000.feffffffffff       no              vif2.2
                                                       pdummy0
                                                       vif0.2

#ip add sh dummy0
7: dummy0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
   link/ether 66:a8:9d:81:4b:51 brd ff:ff:ff:ff:ff:ff
   inet 192.168.6.1/24 brd 192.168.6.255 scope global dummy0


and on domU
# ip add sh dummy0
21: dummy0: <BROADCAST,NOARP,UP> mtu 1500 qdisc noqueue
   link/ether 56:f9:d9:50:d3:87 brd ff:ff:ff:ff:ff:ff
   inet 192.168.6.2/24 brd 192.168.6.255 scope global dummy0


I think that looks ok.
But I can't ping between them.

Any suggestions?

Cheers.
Chris.



On 6/23/06, Esteban Sancho <esteban.sancho@xxxxxxxxx> wrote:
> Hi Chris,
>
> I didn't test that but think it's a good oportunity for you to do so. :o)
>
> I suppose that performance should be better since data don't have to
> go through all the TCP layers.
>
> Please let me know if you need any help configuring it. You'll need to
> create a dummy interface in the Dom0 and configure a vif for the DomU
> pointing to the bridge xend creates when it's started (something like
> xenbr0).
>
> Cheers,
>
> Esteban
>
> On 6/22/06, Chris Fanning <christopher.fanning@xxxxxxxxx> wrote:
> > Hi Esteban,
> >
> > > Could you please post your network configuration (ifconfig is OK) in
> > > both Dom0 and DomU? It could also be helpful if you post your vif line
> > > in the DomU configuration file.
> >
> > Well, I haven't actually tied to do this yet so that means I haven't
> > run into any problems either. :)
> > I was just asking what you thought about the idea.
> >
> > Will I get a faster network connection between dom0 and domU using a
> > dummy interface instead of a real nic?
> >
> > Cheers.
> > Chris.
> >
> > On 6/21/06, Esteban Sancho <esteban.sancho@xxxxxxxxx> wrote:
> > > Hi Chris,
> > >
> > > Could you please post your network configuration (ifconfig is OK) in
> > > both Dom0 and DomU? It could also be helpful if you post your vif line
> > > in the DomU configuration file.
> > >
> > > Regards,
> > >
> > > Esteban
> > >
> > > On 6/20/06, Chris Fanning <christopher.fanning@xxxxxxxxx> wrote:
> > > > Hi all,
> > > >
> > > > I export from dom0 and mount on the domU file system using nfs.
> > > > dom0 exports
> > > > /directory domU_eth0_ip(rw....
> > > >
> > > > and domU mounts
> > > > dom0_eth0_ip:/directory /home nfs tcp,rw 0 0
> > > >
> > > > My question is, would the data transfer be faster if I used a dummy
> > > > interface instead of using a 100mbs nic?
> > > > If so, that means I'd have to setup a bridge for the two dummy
> > > > interfaces or something like that, right? How is that done?
> > > >
> > > > Thanks.
> > > > Chris.
> > > >
> > > > _______________________________________________
> > > > Xen-users mailing list
> > > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > > http://lists.xensource.com/xen-users
> > > >
> > >
> >
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