WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

Re: [Xen-users] help--dom0 network goes unpingable when xend starts

Here's the output of

[root@fnpcsrv5 ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              vif2.0
                                                        vif1.0
                                                        peth0
                                                        vif0.0
xenbr1          8000.000000000000       no

and here's xend-config.sxp

[root@fnpcsrv5 xen]# grep net xend-config.sxp | grep -v ^#
(network-script network-bridge)

And here's what the domU config files show at the moment:

vif = [ 'mac=00:16:3e:0f:05:01, bridge=xenbr0' ]



------------
I was at one point running a second bridge, but took it out
during the debugging.  Nevertheless the xenbr1 doesn't go away.
and I haven't figured out any brctl commands that will make it go away.

From a similarly-configured working machine on different hardware, this
is what I wanted to do (and what I had originally configured on this one too), and has been working fine for me on many other
machines.


[root@fermigrid5 ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              vif12.0
                                                        vif10.0
                                                        vif9.0
                                                        vif8.0
                                                        vif7.0
                                                        peth0
                                                        vif0.0
xenbr1          8000.feffffffffff       no              vif12.1
                                                        vif10.1
                                                        vif9.1
                                                        vif8.1
                                                        vif7.1
                                                        peth1
                                                        vif0.


-------------------------------

[root@fermigrid5 xen]# grep net xend-config.sxp | grep -v ^#
(network-script my-network-bridge)
[root@fermigrid5 xen]# more scripts/my-network-bridge
#!/bin/sh
# start bridges on both eth0 and eth1

XENDIR="/etc/xen/scripts"

$XENDIR/network-bridge "$@" netdev=eth0 bridge=xenbr0 vifnum=0
$XENDIR/network-bridge "$@" netdev=eth1 bridge=xenbr1 vifnum=1
[root@fermigrid5 xen]#

vif = [ 'mac=00:16:3e:05:05:01, bridge=xenbr0', 'mac=00:16:3e:05:05:0a, bridge=xenbr1' ]

Hope this helps us figure out what is wrong.

Have seen a couple places on the net that a bios upgrade
and-or tweak to the broadcom controller is needed
for the PE1950 to fix related problems. Has anyone tried?

Steve Timm



On Mon, 21 Apr 2008, Todd Deshane wrote:

On Thu, Apr 17, 2008 at 9:24 PM, Steven Timm <timm@xxxxxxxx> wrote:

I installed 64-bit xen 3.1.0 (from xensource.com tarballs) on
three new machines today, using a configuration setup that I've
used successfully many times before.  However, I encountered  a
new problem.

These are Dell Poweredge 1950 servers, by the way.

From lspci

04:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708
Gigabit Ethernet (rev 12)
08:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708
Gigabit Ethernet (rev 12)

from lspci
Broadcom NetXtreme II Gigabit Ethernet Driver bnx2 v1.4.44 (August 10,
2006)
ACPI: PCI Interrupt 0000:08:00.0[A] -> GSI 16 (level, low) -> IRQ 16
eth0: Broadcom NetXtreme II BCM5708 1000Base-T (B2) PCI-X 64-bit 133MHz
found at
 mem f4000000, IRQ 16, node addr 0019b9ec40ba
ACPI: PCI Interrupt 0000:04:00.0[A] -> GSI 16 (level, low) -> IRQ 16
eth1: Broadcom NetXtreme II BCM5708 1000Base-T (B2) PCI-X 64-bit 133MHz
found at
 mem f8000000, IRQ 16, node addr 0019b9ec40b8

---------------

note that the Xen kernel 2.6.18 picks the opposite mac addresses as eth0
from what the redhatized non-xen kernel does.  This is
undone by ifcfg-eth0.

When the xen kernel boots, before xend starts, I can see the outside
network just fine.

[root@fnpcsrv3 xen]# netstat -nNr
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt
Iface
192.168.167.0   0.0.0.0         255.255.255.0   U         0 0          0
eth1
131.225.166.0   0.0.0.0         255.255.254.0   U         0 0          0
eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0
eth1
0.0.0.0         131.225.167.200 0.0.0.0         UG        0 0          0
eth0


[root@fnpcsrv3 xen]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:19:B9:EC:40:B8
         inet addr:131.225.166.97  Bcast:131.225.167.255 Mask:
255.255.254.0
         inet6 addr: fe80::219:b9ff:feec:40b8/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:591697 errors:0 dropped:0 overruns:0 frame:0
         TX packets:3060 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:38067586 (36.3 MiB)  TX bytes:395536 (386.2 KiB)
         Interrupt:16 Memory:f8000000-f8011100

eth1      Link encap:Ethernet  HWaddr 00:19:B9:EC:40:BA
         inet addr:192.168.167.3  Bcast:192.168.167.255 Mask:255.255.255.0
         UP BROADCAST MULTICAST  MTU:1500  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
         Interrupt:16 Memory:f4000000-f4011100

lo        Link encap:Local Loopback
         inet addr:127.0.0.1  Mask:255.0.0.0
         inet6 addr: ::1/128 Scope:Host
         UP LOOPBACK RUNNING  MTU:16436  Metric:1
         RX packets:192 errors:0 dropped:0 overruns:0 frame:0
         TX packets:192 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:15314 (14.9 KiB)  TX bytes:15314 (14.9 KiB)
--------------------------------------------------------------

Now here's ifconfig from an identical system once xend is turned on

[root@fnpcsrv5 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:19:B9:EC:4A:21
         inet addr:131.225.166.100  Bcast:131.225.167.255 Mask:
255.255.254.0
         inet6 addr: fe80::219:b9ff:feec:4a21/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:508292 errors:0 dropped:0 overruns:0 frame:0
         TX packets:33 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:30786266 (29.3 MiB)  TX bytes:1658 (1.6 KiB)

lo        Link encap:Local Loopback
         inet addr:127.0.0.1  Mask:255.0.0.0
         inet6 addr: ::1/128 Scope:Host
         UP LOOPBACK RUNNING  MTU:16436  Metric:1
         RX packets:21 errors:0 dropped:0 overruns:0 frame:0
         TX packets:21 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:1916 (1.8 KiB)  TX bytes:1916 (1.8 KiB)

peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
         inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
         UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
         RX packets:523679 errors:0 dropped:0 overruns:0 frame:0
         TX packets:15964 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:33836052 (32.2 MiB)  TX bytes:1132609 (1.0 MiB)
         Interrupt:16 Memory:f4000000-f4011100

vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
         inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
         UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
         RX packets:33 errors:0 dropped:0 overruns:0 frame:0
         TX packets:508293 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:1658 (1.6 KiB)  TX bytes:30786336 (29.3 MiB)

vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
         inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
         UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
         RX packets:7848 errors:0 dropped:0 overruns:0 frame:0
         TX packets:499340 errors:0 dropped:159 overruns:0 carrier:0
         collisions:0 txqueuelen:32
         RX bytes:347417 (339.2 KiB)  TX bytes:30239848 (28.8 MiB)

vif2.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
         inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
         UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
         RX packets:7867 errors:0 dropped:0 overruns:0 frame:0
         TX packets:496186 errors:0 dropped:191 overruns:0 carrier:0
         collisions:0 txqueuelen:32
         RX bytes:346478 (338.3 KiB)  TX bytes:30050363 (28.6 MiB)

xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:508099 errors:0 dropped:0 overruns:0 frame:0
         TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:23650570 (22.5 MiB)  TX bytes:90 (90.0 b)

xenbr1    Link encap:Ethernet  HWaddr 00:00:00:00:00:00
         inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:0 (0.0 b)  TX bytes:468 (468.0 b)

------------------------------------------------------------------------

As part of the debugging I dialed back my configuration, which normally
has a xenbr0 and a xenbr1, to use a just a xenbr0 and have just one
network interface on each domU and on the dom0.  Nevertheless the
problem is the same and I can't seem to get rid of the xenbr1.
I note that at the start of the xend there is a timeout of about 10-15
seconds as it is trying to turn on the second bridge.

Now here is the really strange part.  While logged in on the
console of the dom0, I can go ahead and start xen domU's, and they
go ahead and boot up normally and can see the outside network fine.

[root@fnpcsrv5 ~]# xm list
Name                                      ID   Mem VCPUs      State
Time(s)
Domain-0                                   0  1953     8     r-----
 127.3
fnpc5x1                                    1  6000     4     -b----
23.1
fnpc5x4                                    2  2000     1     -b----
20.6
[root@fnpcsrv5 ~]#

Oh, and by the way, dom0 is pingable from the domU's although
it cannot be seen from the outside net.

What should I be looking at?



Could you also provide the output of:

brctl show

grep net /etc/xen/xend-config.sxp | grep -v '#'

Also, in the domU config files what are you specifying for the bridge?

Are you running any custom network scripts (these would be specified in
/etc/xen/xend-config.sxp and should have shown up in the output of the grep
above.

Cheers,
Todd


Steve Timm



------------------------------------------------------------------
Steven C. Timm, Ph.D  (630) 840-8525
timm@xxxxxxxx  http://home.fnal.gov/~timm/ <http://home.fnal.gov/%7Etimm/>
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Assistant Group
Leader.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users



--
------------------------------------------------------------------
Steven C. Timm, Ph.D  (630) 840-8525
timm@xxxxxxxx  http://home.fnal.gov/~timm/
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Assistant Group Leader.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users