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

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

ok. the interface on domU isn't called dummy0.
It is called eth2


On 7/10/06, Chris Fanning <christopher.fanning@xxxxxxxxx> wrote:
> 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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