Xen users - Aug 2006 - Packets flow from DomU to internet with private IP!

Hello,

I''m receiving my public IP via dhcp. DomU OS has the following
configuration in /etc/network/interfaces:
auto eth0
iface eth0 inet dhcp
/etc/networking/interfaces on Dom0 does not have any special entries.

Virtual machine config has the following options:
vif = [ ''mac=aa:00:00:00:00:d2, bridge=xenbr0'' ]
dhcp="dhcp

I have manually assigned address 192.168.1.1 to xenbr0 in Dom0, made
dhcpd3 listen on it and then booted the VM. It is able to obtain IP via
dhcp, but I doubt if I can configure a default gateway in dhcp3, so I
made it a default gateway in DomU manually.

After all, from within DomU I can ping only my public IP address and
nothing behind it. After executing Ethereal, I see that ICMP echo
requests (as well as any other IP packets generated in DomU) are being
sent to internet with a private (!) IP address 192.168.1.18. It does not
make any difference if ipv4 forwarding is enabled on Dom0 or if there
are any iptables forwarding rules like
iptables -A FORWARD -m physdev --physdev-in eth0 --physdev-out
''!'' eth0
 -j ACCEPT
iptables -A FORWARD -m physdev --physdev-out eth0 --physdev-in
''!'' eth0
 -j ACCEPT
I have tried both ways.

What could be wrong? Actually, there are no instructions on configuring
Xen with dhcp and I could have missed something important.

-- 
Regards,
Andrew Pogrebennyk

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Hi All,

I''ve recently persuaded one of my colleagues to buy my old Athlon XP
3000+
system that I use for running XEN.  (Sucker! :-))  I''d like to replace
it with
an AM2 system so that I can do some experimentation with fully virtualised 
systems (Windows 2003, OpenBSD, etc.)  Has anyone got any hardware 
recommendations for AM2 motherboards that they''ve used successfully
with Xen?
I''m going to pair it with a 3800+ X2 as they''ve plummetted in
price since
Intel announced their Core 2 Duo processors.  Hurrah for competition! :-)

Also, what''s the performance on the forcedeth network drivers for the
NV5
chipset like?  Can you get anywhere near gigabit speeds?  I saw some benches a 
few weeks ago that put the broadcom chips as the best performing network 
chipsets under Linux.  However, I''ve not seen any Am2 motherboards with
onboard broadcom network controllers.

Cheers,

Steve.

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On Tuesday 15 August 2006 11:40 am, higgers wrote:
> Has anyone got any
> hardware recommendations for AM2 motherboards that they''ve used
> successfully with Xen?
I''m running on an Asus M2NPV-VM.

> Also, what''s the performance on the forcedeth network drivers for
the NV5
> chipset like?  Can you get anywhere near gigabit speeds?  I saw some
> benches a few weeks ago that put the broadcom chips as the best performing
> network chipsets under Linux.  However, I''ve not seen any Am2
motherboards
> with onboard broadcom network controllers.
I haven''t done any benchmarking, but from what I understand, it would
be quite
difficult to get Intel/Broadcom performance.

However, you can get PCI-E Broadcom NICs. We have one here.

-- 
James Oakley
Engineering - SolutionInc Ltd.
joakley@solutioninc.com
http://www.solutioninc.com

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Quoting James Oakley <joakley@solutioninc.com>:
> On Tuesday 15 August 2006 11:40 am, higgers wrote:
> > Has anyone got any
> > hardware recommendations for AM2 motherboards that they''ve
used
> > successfully with Xen?
> 
> I''m running on an Asus M2NPV-VM.
> 
Which distribution and kernel version are you using?  I''m planning on
using
SUSE 10.1.
> > Also, what''s the performance on the forcedeth network drivers
for the NV5
> > chipset like?  Can you get anywhere near gigabit speeds?  I saw some
> > benches a few weeks ago that put the broadcom chips as the best
performing
> > network chipsets under Linux.  However, I''ve not seen any Am2
motherboards
> > with onboard broadcom network controllers.
> 
> I haven''t done any benchmarking, but from what I understand, it
would be
> quite 
> difficult to get Intel/Broadcom performance.
> 
> However, you can get PCI-E Broadcom NICs. We have one here.
> 
I didn''t know you could get PCI-E broadcom NICs, thanks for the heads
up.  Did
you have to jump through any hoops to get it to work under Linux like add 
options to kernel config file/patch kernel/etc?
> -- 
> James Oakley
> Engineering - SolutionInc Ltd.
> joakley@solutioninc.com
> http://www.solutioninc.com
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
> 

-- 

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On Tuesday 15 August 2006 12:22 pm, higgers wrote:
> Quoting James Oakley <joakley@solutioninc.com>:
> > On Tuesday 15 August 2006 11:40 am, higgers wrote:
> > > Has anyone got any
> > > hardware recommendations for AM2 motherboards that
they''ve used
> > > successfully with Xen?
> >
> > I''m running on an Asus M2NPV-VM.
>
> Which distribution and kernel version are you using?  I''m planning
on using
> SUSE 10.1.
I''m using SUSE 10.1 with updated kernel/xen packages from Factory (SUSE
10.2
Alpha).

> I didn''t know you could get PCI-E broadcom NICs, thanks for the
heads up.
> Did you have to jump through any hoops to get it to work under Linux like
> add options to kernel config file/patch kernel/etc?
It should work out of the box. There''s no real difference between
onboard and
offboard nics, as far as Linux is concerned.

-- 
James Oakley
Engineering - SolutionInc Ltd.
joakley@solutioninc.com
http://www.solutioninc.com

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I''m using an MSI K9N Platinum and Debian Etch.

Randall

James Oakley wrote:
> On Tuesday 15 August 2006 12:22 pm, higgers wrote:
> 
>>Quoting James Oakley <joakley@solutioninc.com>:
>>
>>>On Tuesday 15 August 2006 11:40 am, higgers wrote:
>>>
>>>>Has anyone got any
>>>>hardware recommendations for AM2 motherboards that
they''ve used
>>>>successfully with Xen?
>>>
>>>I''m running on an Asus M2NPV-VM.
>>
>>Which distribution and kernel version are you using?  I''m
planning on using
>>SUSE 10.1.
> 
> 
> I''m using SUSE 10.1 with updated kernel/xen packages from Factory
(SUSE 10.2
> Alpha).
> 
> 
> 
>>I didn''t know you could get PCI-E broadcom NICs, thanks for the
heads up.
>>Did you have to jump through any hoops to get it to work under Linux
like
>>add options to kernel config file/patch kernel/etc?
> 
> 
> It should work out of the box. There''s no real difference between
onboard and
> offboard nics, as far as Linux is concerned.
> 

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