Re: [Xen-users] Domain0 cannot connect to the net while domainU can.How to make the domain0 go to the internet.

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Jul 28, 2009 at 10:06:37AM +0800, SamuelCheng wrote:
> *Yes,But,When I use another kernel to start my Linux(the kernel is not
> modified by xen,that is to say,xend does not start),I can make my domain0 go
> to google and search.I was confused why my mac is FE:FF:FF:FF:FF:FF.At the
> very beginning,everything was fine in my CentOS,and the mac is
> 00:1b:fc:17:da:7a(I think).*
> 

Please don't drop the CC to xen-users list.

when xend is started, with the default configuration (in 
/etc/xen/xend-config.sxp), 
it'll execute /etc/xen/scripts/network-bridge to re-configure your networking.

It'll rename the physical eth0 interface to peth0, change it's MAC address
to FE:FF:FF:FF:FF:FF, and then create a virtual ethernet interface called
eth0, configure it with the real MAC address, and bridge both of those
interfaces to xenbr0 bridge.

This way the virtual eth0 interface should have a real MAC, and it can be
used for dom0 management, and at the same time allow other VMs/domUs to
share the physical ethernet interface by using xenbr0 bridge.

I don't know why that doesn't work for you.. Have you changed/tweaked your 
network settings somehow?

When you start the machine with normal (non -xen) kernel, xend does not
start and network reconfiguration won't happen.

-- Pasi

> *Ok.here is the information of my OS:
> I have 2 OSs:
> one is Fedora 10 and the other is CentOS 5.3(updated from 5.2).
> here is some kernel information:*
> 
> title CentOS (2.6.18-128.2.1.el5xen)
>     root (hd0,2)
>     kernel /boot/xen.gz-2.6.18-128.2.1.el5
>     module /boot/vmlinuz-2.6.18-128.2.1.el5xen ro root=LABEL=/1 rhgb quiet
>     module /boot/initrd-2.6.18-128.2.1.el5xen.img
> title CentOS (2.6.18-128.2.1.el5)
>     root (hd0,2)
>     kernel /boot/vmlinuz-2.6.18-128.2.1.el5 ro root=LABEL=/1 rhgb quiet
>     initrd /boot/initrd-2.6.18-128.2.1.el5.img
> title CentOS (2.6.18-128.1.16.el5xen)
>     root (hd0,2)
>     kernel /boot/xen.gz-2.6.18-128.1.16.el5
>     module /boot/vmlinuz-2.6.18-128.1.16.el5xen ro root=LABEL=/1 rhgb quiet
>     module /boot/initrd-2.6.18-128.1.16.el5xen.img
> title CentOS (2.6.18-128.1.16.el5)
>     root (hd0,2)
>     kernel /boot/vmlinuz-2.6.18-128.1.16.el5 ro root=LABEL=/1 rhgb quiet
>     initrd /boot/initrd-2.6.18-128.1.16.el5.img
> title CentOS (2.6.18-128.el5xen)
>     root (hd0,2)
>     kernel /boot/xen.gz-2.6.18-128.el5
>     module /boot/vmlinuz-2.6.18-128.el5xen ro root=LABEL=/1 rhgb quiet
>     module /boot/initrd-2.6.18-128.el5xen.img
> title CentOS-base (2.6.18-128.el5)
>     root (hd0,2)
>     kernel /boot/vmlinuz-2.6.18-128.el5 ro root=LABEL=/1 rhgb quiet
>     initrd /boot/initrd-2.6.18-128.el5.img
> title Fedora (2.6.27.21-170.2.56.fc10.i686)
>     root (hd0,5)
>     kernel /vmlinuz-2.6.27.21-170.2.56.fc10.i686 ro
> root=UUID=50e45426-575f-4112-bfa2-54d8741b5ae5 rhgb quiet
>     initrd /initrd-2.6.27.21-170.2.56.fc10.i686.img
> 
> 
> 
> 
> 
> 2009/7/27 Pasi Kärkkäinen <pasik@xxxxxx>
> 
> > On Thu, Jul 23, 2009 at 05:34:36PM +0800, SamuelCheng wrote:
> > > I attach the error I got in the attachment.
> > > The return of the following command:
> > > ifconfig -a
> > > route -n
> > > brctl show
> > >
> > > Here is the content,also you can see the attachment, a little long,so be
> > > patient, some information may be not of any use,but I don't know so I
> > copied
> > > all here,Thank you in advance very one,Good day.
> > > :
> > > [root@localhost ~]# ifconfig -a
> > > eth0      Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
> > >           inet addr:192.168.0.104  Bcast:192.168.0.255
> >  Mask:255.255.255.0
> > >
> >
> > Your problem is the MAC address of eth0: it shouldn't be FE:FF:FF:FF:FF:FF.
> >
> > eth0 is the virtual interface used for dom0 management, and it's bridged to
> > xenbr0, which is bridged to peth0 (physical eth0 interface).
> >
> > eth0 should have the original/real MAC address of the peth0.
> >
> > -- Pasi
> >
> >
> > > [root@localhost ~]# route -n
> > > Kernel IP routing table
> > > Destination     Gateway         Genmask         Flags Metric Ref    Use
> > > Iface
> > > 192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0
> > eth0
> > > 192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0
> > > virbr0
> > > 169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0
> > eth0
> > > 0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0
> > eth0
> > >
> > > [root@localhost ~]# brctl show
> > > bridge name     bridge id               STP enabled     interfaces
> > > virbr0          8000.000000000000       yes
> > > xenbr0          8000.feffffffffff       no              peth0
> > >                                                         vif0.0
> > >
> >
> >
> >
> 
> 
> -- 
> God more,self less.

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