Xen users - May 2008 - Strange dom0 networking error with Debian "Etch" amd64

Hi,



We''re trying to run Xen on a Debian "Etch" base system
(kernel
2.6.18-6-xen-amd64), but have come across a strange networking error 
whenever bridging (vif-bridge/network-bridge) is in operation. The

symptom is that the dom0 base system loses all network connectivity to 
the outside world while the two guest instances function perfectly well. 
As far as we can tell, we haven''t done anything which isn''t
entirely
standard.



Rebooting the base system and preventing xend from setting up the 
bridged environment (by uninstalling ''bridge-utils'') fixes the
problem,
but means that the domUs obviously fail to start. So it looks like this 
is something to do with the way the networking is set up.



A further symptom is that "arping" from another machine gets a reply, 
with the correct MAC address, from the broadcast ping but not the 
unicast one, like this:



$ sudo arping 172.24.189.23

ARPING 172.24.189.23 from 172.24.189.20 eth0

Unicast reply from 172.24.189.23 [00:18:8B:46:4A:CD] 0.688ms

Sent 3 probes (1 broadcast(s))

Received 1 response(s)



$ sudo arping -b 172.24.189.23

ARPING 172.24.189.23 from 172.24.189.20 eth0

Unicast reply from 172.24.189.23 [00:18:8B:46:4A:CD] 0.688ms

Unicast reply from 172.24.189.23 [00:18:8B:46:4A:CD] 0.678ms

Unicast reply from 172.24.189.23 [00:18:8B:46:4A:CD] 0.682ms

Sent 3 probes (3 broadcast(s))

Received 3 response(s)



In /etc/xen/xend-config.sxp we''re using the following options:



(vif-script vif-bridge)

(network-script network-bridge)



The output of ifconfig when bridging''s in operation is below. From all 
our research so far, this looks correct to us.



Has anyone experienced a similar problem? Can anyone suggest a possible 
solution, or maybe something specific we can check for to help fix the 
issue?



Cheers,

Mark



eth0 Link encap:Ethernet HWaddr 00:18:8B:46:4A:CD

inet addr:172.24.189.23 Bcast:172.24.189.63

Mask:255.255.255.192 inet6 addr: fe80::218:8bff:fe46:4acd/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:998452 errors:0 dropped:0 overruns:0 frame:0

TX packets:572 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:85531264 (81.5 MiB) TX bytes:25459 (24.8 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:174 errors:0 dropped:0 overruns:0 frame:0

TX packets:174 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:18657 (18.2 KiB) TX bytes:18657 (18.2 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:1501876 errors:0 dropped:0 overruns:0 frame:0

TX packets:431312 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:312379199 (297.9 MiB) TX bytes:146152245 (139.3 MiB)

Interrupt:16 Memory:f8000000-f8011100



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:572 errors:0 dropped:0 overruns:0 frame:0

TX packets:998452 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:25459 (24.8 KiB) TX bytes:85531264 (81.5 MiB)



vif3.0 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:72721 errors:0 dropped:0 overruns:0 frame:0

TX packets:1092862 errors:0 dropped:170 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:18409842 (17.5 MiB) TX bytes:207173494 (197.5 MiB)



vif4.0 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:318959 errors:0 dropped:0 overruns:0 frame:0

TX packets:1306207 errors:0 dropped:413 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:117331450 (111.8 MiB) TX bytes:175019480 (166.9 MiB)



xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF

inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link

UP BROADCAST RUNNING NOARP MTU:1500 Metric:1

RX packets:995548 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:71388816 (68.0 MiB) TX bytes:0 (0.0 b)



_________________________________________________________________

http://clk.atdmt.com/UKM/go/msnnkmgl0010000007ukm/direct/01/

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