I think I may have encoutered a bug in Xen. I am using Xen as suplied
by RHEL5.
On this particular machine after a reboot I get an interface
veth0 which has all the same ip settings as eth0. In this state no Xen
instances hosted on this machine are accessible to the network.
After a "service xend restart" the veth0 interface disappears and my
Xen
instances can see the network.
I narrowed it down a little and found if I execute the following (from a
screen to avoid my SSH connection dropping) then it also removes this
duff interface.
cd /etc/xen/scripts
./network-bridge stop;./network-bridge start
When I reboot the machine, the misconfigured interface returns. It only
happens on this particular server (which has three network interfaces
installed on the motherboard).
Here is an ifconfig -a output before and after:
eth0 Link encap:Ethernet HWaddr 00:E0:81:43:9C:F6
inet addr:38.99.95.229 Bcast:38.99.95.255 Mask:255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:37 errors:0 dropped:0 overruns:0 frame:0
TX packets:44 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
Interrupt:18
eth0:1 Link encap:Ethernet HWaddr 00:E0:81:43:9C:F6
inet addr:38.99.115.116 Bcast:38.99.115.127
Mask:255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:18
eth0:2 Link encap:Ethernet HWaddr 00:E0:81:43:9C:F6
inet addr:38.99.95.241 Bcast:38.99.95.255 Mask:255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:18
eth1 Link encap:Ethernet HWaddr 00:E0:81:43:9C:F7
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
Interrupt:19
eth2 Link encap:Ethernet HWaddr 00:E0:81:43:3F:90
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
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1 errors:0 dropped:0 overruns:0 frame:0
TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
veth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:38.99.95.229 Bcast:38.99.95.255 Mask:255.255.255.128
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:0
veth1 Link encap:Ethernet HWaddr 00:00:00:00:00:00
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:0
veth2 Link encap:Ethernet HWaddr 00:00:00:00:00:00
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:0
veth3 Link encap:Ethernet HWaddr 00:00:00:00:00:00
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:0
vif0.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
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:0
vif0.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
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:0
vif0.2 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
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:0
vif0.3 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
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:0
xenbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
UP BROADCAST RUNNING NOARP 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:0
----------------------
and after a "service xend restart"
eth0 Link encap:Ethernet HWaddr 00:E0:81:43:9C:F6
inet addr:38.99.95.229 Bcast:38.99.95.255 Mask:255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:17 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
eth0:1 Link encap:Ethernet HWaddr 00:E0:81:43:9C:F6
inet addr:38.99.115.116 Bcast:38.99.115.127
Mask:255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
eth0:2 Link encap:Ethernet HWaddr 00:E0:81:43:9C:F6
inet addr:38.99.95.241 Bcast:38.99.95.255 Mask:255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
eth1 Link encap:Ethernet HWaddr 00:E0:81:43:9C:F7
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
Interrupt:19
eth2 Link encap:Ethernet HWaddr 00:E0:81:43:3F:90
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
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:3 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:21 errors:0 dropped:0 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
Interrupt:18
veth1 Link encap:Ethernet HWaddr 00:00:00:00:00:00
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:0
veth2 Link encap:Ethernet HWaddr 00:00:00:00:00:00
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:0
veth3 Link encap:Ethernet HWaddr 00:00:00:00:00:00
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:0
vif0.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:17 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
vif0.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
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:0
vif0.2 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
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:0
vif0.3 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
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:0
xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:13 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
------------
So my basic question is wy is Xend creating this duff veth0 interface
and then clearing it on a xend restart? Of course the solution for now
is to add a restart in my /etc/rc.local but I guess that is not ideal.
Drak
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Drak wrote on Sun, 04 May 2008 09:25:38 +0545:> So my basic question is wy is Xend creating this duff veth0 interface > and then clearing it on a xend restart?RHEL5 uses an older version of Xen networking that isn''t used in that form anymore. I''m not sure, but I think you may have hit a bug in the network- bridge script that I encountered some weeks ago. Basically it depends on a gateway output from ip route list like this "default via <IP> dev eth0". If the machine has several IP addresses from different subnets and gateways for *all* of them are not explicitely set this line looks a bit different and the network-bridge script fails (silently). If the Dom0 network gets stopped and restarted by network-bridge then it works for a reason I have already forgotten. You can either change the script or update to Xen 3.2 where this script (and other stuff) changed completely. Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users