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xen-devel
Re: [Xen-devel] xenU's on separate subnets
Hi,
I'm still curious on the bridge part, but I did finally get this working
by using proxy arp and routing. I needed to force the upstream router
to clear it's ARP cache and then it worked. Even though I had waited
upwards of 10 minutes when trying it before it appears that wasn't long
enough.
On Mon, 2005-01-24 at 23:28 -0500, Matt Ayres wrote:
> Hi,
>
> I've currently run into the situation where Xen in bridged mode will
> only work for IP's on the same subnet as domain0. Routed mode isn't an
> option as IP's on the same subnet will be in use by other
> virtual/physical servers. Currently the router is configured to handle
> about a dozen subnet's and it aliases an IP to it's interface for use as
> a default gateway for LAN devices.
>
> If I configure the xenU's on the same subnet as domain0 things work fine
> so I am sure the bridge config is correct. To make sure though I did
> make Xend use my bridge setup that works for my User Mode Linux VM's.
>
> 1) Using Linux bridging I am able to accomplish what I want using User
> Mode Linux. As far as I can tell UML is not doing anything special, the
> interface options are identical once the interfaces are created. I have
> tried putting the vif interfaces into promiscuous mode.
>
> Why is this possible under UML and not Xen when both use Linux kernel
> bridging?
>
> 2) Does anyone have ideas for possible solutions? I've tried various
> methods of iptables/nat and proxy_arp setups and have been unable to get
> this to work. I know I could do a 1-to-1 mapping of external IP's to an
> internal subnet using nat, but that would be very ugly and not something
> I think of as a workable solution. Ideally i'd like to continue using
> bridging.
>
> --
> Thanks,
> Matt
>
>
>
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