[Q] eth0 not up on dom0

[Q] eth0 not up on dom0

[Bharadwaj Yadavalli]

Apologies if this is trivial and an FAQ. Google search
hasn't helped.

I have been unsuccessful in getting eth0 interface up in
dom0. My linux installation is FC3 and I get my address via
DHCP. I am running Linux 2.6.11-xen0. I see the following
steps recommended in the bridge-utils HOWTO page

1. Zero IP the interfaces. The bridge needs the network
   devices to be operational, but without TCP/IP running on
   them. 
      # ifconfig eth0 0.0.0.0

2. Create the bridge interface.
      # brctl addbr mybridge
3. Add interfaces to the bridge.
      # brctl addif mybridge eth0

[I believe steps 2 amd 3 will be done by executing 
 xend start. I verified this by running 'brctl show' 
 after I ran 'xend start']

4. Put up the bridge.
      # ifconfig xen-br0 up

Now that I have the bridge up, I tried running 

    ifup eth0

to get an IP address.

I get the following:

  "Determining IP information for eth0...PING
   <my.dhcp.server.address> from
   <what-I-think.is-the-IP.address.I-was-assigned>: eth0"

[usual ping statistics stuff]

failed.

I suspect I am close but not there. Can someone provide the
nudge please?

Thanks,

Bharadwaj



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RE: [Q] eth0 not up on dom0

[Ian Pratt]

> [I believe steps 2 amd 3 will be done by executing 
>  xend start. I verified this by running 'brctl show' 
>  after I ran 'xend start']
> 
> 4. Put up the bridge.
>       # ifconfig xen-br0 up
> 
> Now that I have the bridge up, I tried running 
> 
>     ifup eth0
> 
> to get an IP address.

It's 'mybridge' you want to configure with dhcp, not eth0.
You'll need to create an appropriate ifcfg-mybridge file then 'ifup
mybridge'.

Ian 



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Re: [Q] eth0 not up on dom0

[Bharadwaj Yadavalli]

Hi Ian,

Thanks for your reply.

However, I am still unable to get my network interface
up in dom0. Here is what I did:

I created a /etc/sysconfig/network-scripts/ifcfg-xen-br0
as you suggested.

# more /etc/sysconfig/network-scripts/ifcfg-xen-br0
DEVICE=xen-br0
BOOTPROTO=dhcp
ONBOOT=no
TYPE=Ethernet
DHCP_HOSTNAME=<myhostname>
USERCTL=no
PEERDNS=yes
IPV6INIT=no

[I also needed to modify

/etc/sysconfig/network-scripts/network-functions 

so that the device xen-br0 is not picked as xen but as xen-br0.]

Anyway, once dom0 booted, I do the following :

# ifconfig eth0 0.0.0.0 up
# xend start
# ifup xen-br0

I see dhclient running (ps) but I get 

=======
Determining IP information for xen-br0... xen-br0
failed
======

What am I missing? I verified that eth0 interface would come
up as expected and I get an IP address when booted with standard
FC3 Linux kernel.

Thanks for your help once again,

Bharadwaj

On Thu, Mar 24, 2005 at 09:42:44PM -0000, Ian Pratt wrote:
> > [I believe steps 2 amd 3 will be done by executing 
> >  xend start. I verified this by running 'brctl show' 
> >  after I ran 'xend start']
> > 
> > 4. Put up the bridge.
> >       # ifconfig xen-br0 up
> > 
> > Now that I have the bridge up, I tried running 
> > 
> >     ifup eth0
> > 
> > to get an IP address.
> 
> It's 'mybridge' you want to configure with dhcp, not eth0.
> You'll need to create an appropriate ifcfg-mybridge file then 'ifup
> mybridge'.
> 
> Ian 
> 


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