Xen users - Sep 2011 - Unable to get IP address in guest OS through DHCP

Hello,

I have a Gentoo Linux guest, which was working very well with the past
xm tool stack.
Since the migration to xen-4.1.1 and to the new xl tool stack, I have
a problem for the IP
assignation. Actually, when dhcpcd starts at boot time the IP address
is not correctly assigned.
This also happens if I perform "dhcpcd eth0" once I''ve
accessed to the
guest shell.

I don''t know what happens, but it always worked with the previous xen
tool stack. I use a bridge
for the guest OS networking and it is called xenbr0.

This is what I see when dhcpcd starts:
 * Starting eth0
 *   Bringing up eth0
 *     dhcp
 *       Running dhcpcd ...dhcpcd[2226]: version 5.2.10 starting
dhcpcd[2226]: eth0: checking for 169.254.86.217
dhcpcd[2226]: eth0: using IPv4LL address 169.254.86.217
dhcpcd[2226]: forked to background, child pid 2247

I don''t know if it could be a guest kernel configuration problem (I
don''t think so) or something else, but the
network is not working. It should get an IP address of the type 192.168.1.0/24.

The configuration file is:

kernel = "/mnt/dati/xen/kernel/vmlinuz-xen-3.0.4-domU"
memory = "512"
name = "gentoo-10.0-x86_64"
vif = [''bridge=xenbr0'']
dhcp = "dhcp"
disk =
[''file:/mnt/data/xen/vmstore/gentoo-10.0/gentoo-10.0.x86-64.img,xvda1,w'',
''file:/mnt/data/xen/vmstore/gentoo-10.0/swap.img,xvda2,w'']
root = "/dev/xvda1 ro"
vcpus = 2
extra   = ''console=hvc0 xencons=tty''
ip = "off"

Thanks

-- 
Flavio

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On Sun, Sep 25, 2011 at 8:49 AM, Flavio <fbcyborg@gmail.com>
wrote:
> Hello,
>
> I have a Gentoo Linux guest, which was working very well with the past
> xm tool stack.
> Since the migration to xen-4.1.1 and to the new xl tool stack, I have
> a problem for the IP
> assignation
http://wiki.xen.org/xenwiki/MigrationGuideToXen4.1%2B
http://wiki.xen.org/xenwiki/HostConfiguration/Networking
(Gentoo-specific instruction are not listed, but the Gentoo wiki page
on the topic should help
http://en.gentoo-wiki.com/wiki/Bridging_Network_Interfaces)
> vif = [''bridge=xenbr0'']
You should use brctl show to make sure that you have the xenbr0 set up properly.

If it is, you can do networking tracing on the vif and bridge from
dom0 and within the domU for its interface to see where the traffic is
making it to.

Hope that helps.

Thanks,
Todd

-- 
Todd Deshane
http://www.linkedin.com/in/deshantm
http://www.xen.org/products/cloudxen.html
http://runningxen.com/

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On 26 September 2011 02:27, Todd Deshane <todd.deshane@xen.org>
wrote:
>
> http://wiki.xen.org/xenwiki/MigrationGuideToXen4.1%2B
> http://wiki.xen.org/xenwiki/HostConfiguration/Networking
> (Gentoo-specific instruction are not listed, but the Gentoo wiki page
> on the topic should help
> http://en.gentoo-wiki.com/wiki/Bridging_Network_Interfaces)
Thank you so much Todd,

I''ve read all of those links actually, and I''ve created a
bridge xenbr0
at system level as the wiki says, but no luck with the network with
the new toolstack and xen version.
>
> > vif = [''bridge=xenbr0'']
>
> You should use brctl show to make sure that you have the xenbr0 set up
properly.
Here it is:
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.00248c08d07e       no              eth0

>
> If it is, you can do networking tracing on the vif and bridge from
> dom0
Honestly I don''t know how to do it.
> and within the domU for its interface to see where the traffic is
> making it to.
I don''t think there is a real traffic between interfaces; it''s
like if there
wasn''t any communication between the vif (the guest network card)
and the xenbr0 interface.

Thank you,

--
Flavio

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On Mon, Sep 26, 2011 at 2:52 AM, Flavio <fbcyborg@gmail.com>
wrote:
> On 26 September 2011 02:27, Todd Deshane <todd.deshane@xen.org>
wrote:
>> > vif = [''bridge=xenbr0'']
>>
>> You should use brctl show to make sure that you have the xenbr0 set up
properly.
> Here it is:
> bridge name     bridge id               STP enabled     interfaces
> xenbr0          8000.00248c08d07e       no              eth0
Is this with the guest running or not?

With the guest running there should be a vif attached to the xenbr0 bridge


-- 
Todd Deshane
http://www.linkedin.com/in/deshantm
http://www.xen.org/products/cloudxen.html
http://runningxen.com/

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On 26 September 2011 19:14, Todd Deshane <todd.deshane@xen.org>
wrote:
> On Mon, Sep 26, 2011 at 2:52 AM, Flavio <fbcyborg@gmail.com> wrote:
>> On 26 September 2011 02:27, Todd Deshane <todd.deshane@xen.org>
wrote:
>>> > vif = [''bridge=xenbr0'']
>>>
>>> You should use brctl show to make sure that you have the xenbr0 set
up properly.
>> Here it is:
>> bridge name     bridge id               STP enabled     interfaces
>> xenbr0          8000.00248c08d07e       no              eth0
>
> Is this with the guest running or not?
This happens in both cases. By the way, I also enabled STP.
>
> With the guest running there should be a vif attached to the xenbr0 bridge
Actually there is no vif attached to the xen bridge.

Thank you.


-- 
Flavio

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On Mon, Sep 26, 2011 at 1:28 PM, Flavio <fbcyborg@gmail.com>
wrote:
>> Is this with the guest running or not?
> This happens in both cases. By the way, I also enabled STP.
>
>>
>> With the guest running there should be a vif attached to the xenbr0
bridge
> Actually there is no vif attached to the xen bridge.
OK. My guess would be that the xend networking code is still in play
and conflicting. You should try to disable xend, but at minimum make
sure that the bridge and vif scripts are disabled in the xend config
file.

Hope that helps.

Thanks,
Todd

-- 
Todd Deshane
http://www.linkedin.com/in/deshantm
http://www.xen.org/products/cloudxen.html
http://runningxen.com/

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On 26 September 2011 19:45, Todd Deshane <todd.deshane@xen.org>
wrote:
>
> OK. My guess would be that the xend networking code is still in play
> and conflicting. You should try to disable xend, but at minimum make
> sure that the bridge and vif scripts are disabled in the xend config
> file.
I don''t think it''s because of xend. Actually it
doesn''t exist anymore on my
system.
What can I check about the bridge, on the config file? It should be
all right there.

Thanks,

Flavio

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On 26 September 2011 20:27, Flavio <fbcyborg@gmail.com>
wrote:
> I don''t think it''s because of xend. Actually it
doesn''t exist anymore on my
> system.
> What can I check about the bridge, on the config file? It should be
> all right there.
What I can say about the config files is that in the /etc/xen/xl.conf
I only have this line:
vifscript="vif-bridge"

The /etc/xen/xend-config.sxp still exists but the xend init script is no longer
present.

-- 
Flavio

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On 26 September 2011 20:42, Flavio <fbcyborg@gmail.com>
wrote:
> What I can say about the config files is that in the /etc/xen/xl.conf
> I only have this line:
> vifscript="vif-bridge"
Problem solved changing the above line with the following one:
vifscript="/etc/xen/scripts/vif-bridge"

So the complete path to the vif-bridge file was necessary.
# brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.00248c08d07e       yes             eth0
                                                        vif1.0
                                                        vif2.0

Bye,

-- 
Flavio

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