Xen users - Dec 2005 - domU network configuration question

Hi,

I''ve installed xen-2.0.7, and I''m trying to get networking in
my
domU set up correctly.

My server has one NIC, but five IP addresses.  My dom0 uses the
first IP address.  I''d like my domU to use the second IP address.

Originally my /etc/network/interfaces on the dom0 defined interfaces
for the first two IP addresses as:

  auto eth0
  iface eth0 inet static
  address 69.93.218.2
  netmask 255.255.255.248
  gateway 69.93.218.1

  auto eth0:0
  iface eth0:0 inet static
  address 69.93.218.3
  netmask 255.255.255.248

I have removed "eth0:0" from dom0, but I would like that 69.93.218.3
IP address to be assigned to the domU.  My domU /etc/network/interfaces
now looks like:

  auto eth0
  iface eth0 inet static
  address 69.93.218.3
  netmask 255.255.255.248
  gateway 69.93.218.1

As you can see, I just copied what used to be "eth0:0" on dom0, and
put it in the domU (adding the gateway parameter from dom0''s eth0.)

However, this doesn''t appear to be working.  The domU boots up, and 
the interface is there with correct-looking parameters - but I can''t
ping anything.

If anyone can point out what I''m doing wrong, it''d be most
appreciated.

Thanks!

Regards,

Bill



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Bill Kelly wrote:
> Hi,
> 
> I''ve installed xen-2.0.7, and I''m trying to get
networking in my
> domU set up correctly.
This has been fixed in later releases.

If you need to make it work in 2.0.7, try the following:

In your 2.0.7 /etc/xen/scripts/network-bridge script,
insert an extra egrep cmd after:
"| egrep ''^ *inet ''"
as in:
"| egrep ''^ *inet '' | egrep "${src}$"

thanks,
Nivedita
> My server has one NIC, but five IP addresses.  My dom0 uses the
> first IP address.  I''d like my domU to use the second IP address.
> 
> Originally my /etc/network/interfaces on the dom0 defined interfaces
> for the first two IP addresses as:
> 
>  auto eth0
>  iface eth0 inet static
>  address 69.93.218.2
>  netmask 255.255.255.248
>  gateway 69.93.218.1
> 
>  auto eth0:0
>  iface eth0:0 inet static
>  address 69.93.218.3
>  netmask 255.255.255.248
> 
> I have removed "eth0:0" from dom0, but I would like that
69.93.218.3
> IP address to be assigned to the domU.  My domU /etc/network/interfaces
> now looks like:
> 
>  auto eth0
>  iface eth0 inet static
>  address 69.93.218.3
>  netmask 255.255.255.248
>  gateway 69.93.218.1
> 
> As you can see, I just copied what used to be "eth0:0" on dom0,
and
> put it in the domU (adding the gateway parameter from dom0''s
eth0.)
> 
> However, this doesn''t appear to be working.  The domU boots up,
and the
> interface is there with correct-looking parameters - but I can''t
> ping anything.
> 
> If anyone can point out what I''m doing wrong, it''d be
most
> appreciated.
> 
> Thanks!
> 
> Regards,
> 
> Bill
> 
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
> 

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Hi,

Has anyone successfully configured Xen to work with a server having:

 1 NIC.
 Multiple IPs.  (e.g. 69.93.218.2, 69.93.218.3, 69.93.218.4, ...)
 dom0 using one IP.  (e.g. 69.93.218.2)
 domU using another IP.  (e.g. 69.93.218.3)

?


If anyone has successfully configured Xen to work this way, I''d 
be grateful to learn the details of your configuration and what
version of Xen you''re using.  I haven''t been able to get this
working yet.  (My domU ends up with no network connectivity.)


Thanks for your help,

Regards,

Bill



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On Wed, Dec 07, 2005 at 12:40:17AM -0800, Bill Kelly
wrote:
> Hi,
> 
> Has anyone successfully configured Xen to work with a server having:
> 
> 1 NIC.
> Multiple IPs.  (e.g. 69.93.218.2, 69.93.218.3, 69.93.218.4, ...)
> dom0 using one IP.  (e.g. 69.93.218.2)
> domU using another IP.  (e.g. 69.93.218.3)
This is a fairly normal config when bridging, since the eth0 and all
vifs are going to be on the same layer 2 network they can all take
addresses from the same network.

Paste output of:

ifconfig -a
brctl show
ip ro

For example:

eth0      Link encap:Ethernet  HWaddr 00:E0:81:64:1D:07
          inet addr:212.13.198.69  Bcast:212.13.198.255  Mask:255.255.255.224

xen-br0   Link encap:Ethernet  HWaddr 00:E0:81:64:1D:07
          inet addr:212.13.198.69  Bcast:212.13.198.255  Mask:255.255.255.255

$ brctl show
bridge name     bridge id               STP enabled     interfaces
xen-br0         8000.00e081641d07       no              eth0
                                                        vif-struggler.0
$ ip ro
212.13.198.64/27 dev xen-br0  proto kernel  scope link  src 212.13.198.69
default via 212.13.198.65 dev xen-br0

and in the domU connected to vif-struggler.0:

eth0      Link encap:Ethernet  HWaddr AA:00:00:4B:A0:C1
          inet addr:212.13.198.70  Bcast:212.13.198.255  Mask:255.255.255.224

212.13.198.69/27 and 212.13.198.70/27 are obviously both on the same
layer 2 network (212.13.198.64 -> 212.13.198.95), nothing special
needed to be done to make the bridging work.

Make sure you aren''t adding the IP of your domU to any interface in
dom0.

Andy


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Hi Andy,

From: "Andy Smith" <andy@strugglers.net>
> >
> > Has anyone successfully configured Xen to work with a server having:
> > 
> > 1 NIC.
> > Multiple IPs.  (e.g. 69.93.218.2, 69.93.218.3, 69.93.218.4, ...)
> > dom0 using one IP.  (e.g. 69.93.218.2)
> > domU using another IP.  (e.g. 69.93.218.3)
> 
> This is a fairly normal config when bridging, since the eth0 and all
> vifs are going to be on the same layer 2 network they can all take
> addresses from the same network.
[...]

Thanks for the detailed response!  I''ve been informed this bridging
functionality may have been broken in certain versions of Xen,
such as 2.0.7 (stable), which is what I was using.

Might I inquire as to which version of Xen you''re running?


Thanks,

Bill







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Bill Kelly wrote:
> Hi Andy,
> 
> From: "Andy Smith" <andy@strugglers.net>
> 
>> >
>> > Has anyone successfully configured Xen to work with a server
having:
>> > > 1 NIC.
>> > Multiple IPs.  (e.g. 69.93.218.2, 69.93.218.3, 69.93.218.4, ...)
>> > dom0 using one IP.  (e.g. 69.93.218.2)
>> > domU using another IP.  (e.g. 69.93.218.3)
>>
>> This is a fairly normal config when bridging, since the eth0 and all
>> vifs are going to be on the same layer 2 network they can all take
>> addresses from the same network.
> 
> [...]
> 
> Thanks for the detailed response!  I''ve been informed this
bridging
> functionality may have been broken in certain versions of Xen,
> such as 2.0.7 (stable), which is what I was using.
> 
> Might I inquire as to which version of Xen you''re running?
Bill, your exact scenario is still not understood.
Are you using one physical NIC with multiple IPs (aliases)?

If your initial configuration was an interface with
multiple IPs, then not all IPs got transferred from
the phyical interface to the virtual one we create.
Those, however, have nothing to do with the interfaces
in domU.

Note that domU interfaces are created independently
and are virtual.

thanks,
Nivedita



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Hi Nivedita,
> Bill, your exact scenario is still not understood.
> Are you using one physical NIC with multiple IPs (aliases)?
Yessir.  One physical NIC, with five IPs.
(69.93.218.2, 69.93.218.3, 69.93.218.4, 69.93.218.5, 69.93.218.6)
> If your initial configuration was an interface with
> multiple IPs, then not all IPs got transferred from
> the phyical interface to the virtual one we create.
> Those, however, have nothing to do with the interfaces
> in domU.
> 
> Note that domU interfaces are created independently
> and are virtual.
Hmm.  Well for whatever reason - although my configuration
looked pretty much like what Andy had posted - my domU was
unable to ping anything on the network.

I''ve presumed the problem is probably some mistake I''ve made
in configuration, so that''s why I was asking for configuration
details from folks who had this type of setup running
successfully.

So you''re saying it shouldn''t matter to my domU that "not
all
the IPs got transferred from the physical interface to the
virtual one." ?


Regards,

Bill



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Hi Bill,

first: bridging does work in 2.0.7. I have it running on several machines.

Second: If you want to use several IPs for your domUs (what is exactly 
what you normally do :-) ), you just have to assign ONE of the IPs to 
your physical nic (no multihoming has to be configured there).
The other IPs are assigned to the domUs (in the domUs 
/etc/network/interfaces e.g.).

When you start the domUs, xen scripts connect them to a bridge that has 
been set up before. That all is part of the default configuration. You 
just have to assign one IP to the physical interface and one to each domU.

Dirk

Bill Kelly schrieb:
> Hi Nivedita,
>
>> Bill, your exact scenario is still not understood.
>> Are you using one physical NIC with multiple IPs (aliases)?
>
>
> Yessir.  One physical NIC, with five IPs.
> (69.93.218.2, 69.93.218.3, 69.93.218.4, 69.93.218.5, 69.93.218.6)
>
>> If your initial configuration was an interface with
>> multiple IPs, then not all IPs got transferred from
>> the phyical interface to the virtual one we create.
>> Those, however, have nothing to do with the interfaces
>> in domU.
>>
>> Note that domU interfaces are created independently
>> and are virtual.
>
>
> Hmm.  Well for whatever reason - although my configuration
> looked pretty much like what Andy had posted - my domU was
> unable to ping anything on the network.
>
> I''ve presumed the problem is probably some mistake I''ve
made
> in configuration, so that''s why I was asking for configuration
> details from folks who had this type of setup running
> successfully.
>
> So you''re saying it shouldn''t matter to my domU that
"not all
> the IPs got transferred from the physical interface to the
> virtual one." ?
>
>
> Regards,
>
> Bill
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users


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