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xen-devel
RE: [Xen-devel] help with bugs
> > I'd like to appeal for some help tracking down a couple of
> bugs that
> > we're struggling to reproduce:
> >
> > BUG62 eth0 -> veth0 in network script can loose network
>
> I think the only sane way to fix this is to let the
> distribution tools configure the network. Thats a bit harder
> to set up, but works more reliable.
Yep, having the distro scripts do it always preferable. However, we do
need something that people can use in the interim.
I guess people would still want the distro scripts to be able to cope
with enabling/disabling xen networking at run time rather than just
configuring it once at boot.
> Also the "if{up|down}
> <interface>" commands and the like will work as usual then.
> Especially in case eth0 is configured via dhcp the ip address
> copying is a bad idea. Unfortunaly it isn't very good
> documented how all this works, especially the new veth0 thing.
I'd be inclined to rename the physical interface to pethN, and create
veth0 as eth0. I think this should solve the DHCP issue.
> IMHO it would be good if the network start script checks
> whenever any bridges are already present in the system and
> don't touch the network setup if that is the case. That
> should catch both network setup being already done by the
> distro start scripts or by an earlier network setup script
> run (when xend is restarted).
I believe (hope?) it already copes wih xend restart.
If you're using distro or other scripts then you can disable it from
xend-config.sxp.
> The setup I'm running looks like this (classic 2.x setup, no
> veth0/vid0.0 used), in boot.local:
>
> ip link set eth0 name hw-eth0
> brctl addbr eth0
> brctl addif eth0 hw-eth0
> ip link set hw-eth0 up
> ip link set eth0 up
>
> Then let the network scripts setup eth0 (now a bridge) as
> usual and tell xend that "eth0" is the bridge device it
> should add the vif interfaces to.
So you don't use veth0? This is dangerous if you run services in dom0
that are being used by the domUs.
Ian
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