[Xen-users] Xen and Bonding on Centos 5.2

["Dirk H. Schulz" <dirk.schulz@xxxxxxxxxxxxx>]

Hi folks,

I have a server where I have solved the well known problem with a bonding 
interface as netdev on Xen/Centos 5.x (current: 5.2) - the problem is, that 
in mode=1 (active-passive) the slave interfaces are de-/activated round 
robin at least once a second. "network-bridge stop netdev=bond0" stops this 
nonsense and makes the bonded interface work well again.
I had to do change 3 entries to get it running:
1. in /etc/xen/xend-config.sxp I set "(network-script 'network-bridge 
netdev=bond0')" - that is explicitly naming the 'physical' interface.
2. in /etc/libvirt/qemu/networks/default.xml I have set xenbr0 to be the 
default bridge.
3. in /etc/sysctl.conf I added "net.ipv4.conf.all.proxy_arp = 0"

Now I have set up a second server exactly like the first (even with the 
same NIC chips, t3), but this time the problem persists: the slave 
interfaces start switching permanently as soon as the network-bridge script 
has moved bond0 to the bridge.
I have looked and tested for days now, but I do not come to any result. My 
first thought was that with the first server setup I forgot to document 
some little change I made. So I sought the web and compared my config 
files, but I cannot find anything.
I need help in this, please! I am stuck within the problem, I do not see 
anything at all any more. There must be something I overlook - any hint or 
help is greatyl appreciated.
Dirk


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