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Re: Re: [Xen-users] DomU routed traffic disappearing in vif.

To: "Matej Zary" <zary@xxxxxxxxx>, xen-users-bounces@xxxxxxxxxxxxxxxxxxx, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Jeremy@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, Fitzhardinge@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Subject: Re: Re: [Xen-users] DomU routed traffic disappearing in vif.
From: mdlabriola@xxxxxxxxx
Date: Sat, 8 May 2010 13:07:02 +0000
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I reported almost the same problem on xen-devel a few weeks ago and didn't get 
many responses.  My testing indicates that something regarding the bridging in 
the pv_ops kernels is quite broken.  I was using with Xen 3.4.2 at 
the time.  Gonna try upgrading to 4.0 and all Jeremy's other kernel branches on 

My setup was using VLAN interfaces over the eth0 bridge, but fleshing it out to 
3 bridges and eth1-3 on domU also didn't work.


Ps - darn these top posts... But I'm at home.  ;-)

Michael D Labriola
21 Rip Van Winkle Cir
Warwick, RI 02886

-----Original Message-----
From: Matej Zary <zary@xxxxxxxxx>
Date: Sat, 8 May 2010 13:21:25 
To: xen-users@xxxxxxxxxxxxxxxxxxx<xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: Re: [Xen-users] DomU routed traffic disappearing in vif.

On Sat, 2010-05-08 at 02:53 +0200, Matej Zary wrote:
> Hello,
> XEN 4.0 with pvops Dom0 kernel. Configured PV DomU with the same 
> pvops Xen kernel on top of it.
> Physical computers has 3 NICs - every NIC in own bridge (first one created by 
> Xen).
> eth0          8000.00138fe78f1b       no              peth0
> mst1          8000.0040f4b5286e       no              eth1
>                                                       vif5.0
> mst2          8000.000e2e68db10       no              eth2
>                                                       vif5.1
> Attached 2 virtual NICs to the PV DomU and bridges - I want to use that DomU 
> as router between that two bridges (enabled ip_forwarding in DomU) - mst1 and 
> mst2.
> I can ping from netwok on eth1 the vif5.0 interface.
> I can ping from network on eth2 the vif5.1 interface.
> I can see with tcpdump, that the DomU routes the traffic between its eth0 and 
> eth1 interfaces (tcpdump inside the domu).
> I can see with tcpdump the incoming traffic in mst1 and vif5.0.
> But there's nothing on the vif5.1and mst2 bridge - even when tcpdump on the 
> eth1 in that PV DomU shows the routed traffic ("works"  the same in opposite 
> direction too).
> Looks like all traffic routed by that PV DomU cant't get from DomU eth 
> interface to the vif interface. Ping from the DomU works (non routed 
> traffic), but no routed traffic can get thu this Dom0.
> IPltables flushed with -F 
> Thanks for every idea, i'm clueless right now. :(
> Regars 
> Matej

Well, it's the dreaded cksum incorrect error (and Real(BAD)tek PCI
NICs). Tried to set off the tx check-summing on all interfaces (eth
interfaces in DomU, eth and bridge interfaces in Dom0) with ethtool -K
iface tx off, and it changed the situation a little bit - now are these
packets with incorrect checksum visible on the outgoing eth2 physical
NIC in the mst2 bridge and also on physical host in the physical network
connected to mst2 bridge via the eth2 NIC. Final result ist still the
same, physical hosts routed via the DomU can't communicate (now they are
getting packets with wrong checksum at least :D). 

Any chances that newer pv_ops kernel that the (git stable)
version will solve this issue? Or I have to switch to the 2.6.18 and the
forwardported oldstyle kernels? 



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