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RE: [Xen-devel] nfsroot and brige

On Wed, 12 Jan 2005, Ian Pratt wrote:

> > hello,
> >     it seems like a catch-22 to me. I boot xen0 with nfsroot,
> >     and then try to setup bridge stuff. something like this
> >
> > /sbin/brctl addbr xen-br0
> > /sbin/brctl addif xen-br0 eth0
> > /sbin/ifconfig xen-br0 netmask up
> > /sbin/ifconfig eth0 promisc up
> >
> >     however, once I start it running it crashes down with error
> >     that nfs server is not available.
> >
> >     does it mean that I must use initramfs to configure bridge
> >     first, or is there some other way?
> It really bugs me that there's no atomic way to configure a bridge and
> transfer an IP address already active on another interface to it. I'm
> not 100% convinced that the current behaviour is actually what the
> bridge code author's intend: a the host can still transmit packet's with
> an IP associated with an eth interface that is part of a bridge, it just
> can't receive packets on that IP. I'd certainly appreciate it if someone
> could ask the question on the bridge mailing list...
> The workarounds for using nfsroot in dom0 at the moment are: a) use a
> ramfs to configure the bridge; b) use a routed rather than bridged
> setup.
> I'm actually going off the whole idea of bridging rather than routeing
> as the default...

Actually, our setup here uses proxy_arp, which is close to bridging anyways.

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