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xen-users
Re: [Xen-users] Is this simplest path to subnets?
John Morris wrote:
The way I do it these days is just to set up a bridge outside xen with
an ip address. You don't need a network script in the xen config that
way. Then you can just add your domU interfaces to the bridge, and
route between the bridge device and the physical device.
I don't know which distribution you are using. Fedora, CentOS and RHEL
would give you a solution for this out of the box through the libvirt
which automatically creates an interface named virbr0 instead of dummy0.
All that you have to do is enbale ip forwarding in Dom0 to route traffic
from guests to external networks.
--Sadique
John
Valter Douglas Lisbôa Jr. wrote:
On Tuesday 19 February 2008 23:55:58 Stephan Seitz wrote:
I did a similar setup by
modprobe dummy
ifconfig dummy0 up
and using a wrapper script for network-bridge to setup bridges
for eth0 and dummy0 (i also wanted eth0 bridged)
I do this, in a very similar wrapping you use.
this generally works, but i suspect this bridge as reason for
dom0 freeze on heavy net-io... maybe someone can confirm problems
with dummy bridges?
But I don't find any freeze problems with high I/O, and believe me I
have four on productions server with great load on network and I
trying various benchmarking tests between VMs and copy huge amount of
data between them. I already stop a low cost Encore switch in one of
this tests ;-)
Tom Horsley schrieb:
I've been making my brain hurt by reading up on xen networking,
and I wonder if I finally understand the simplest path to getting
my virtual machines on a separate subnet:
I create a config similar a level 2 bastion firewall with a dmz. The
two gateways to server the edges (one to LAN and other to WAN) has
two separate bridges each like the diagram bellow
WAN---(Brdige WAN)---[VM1]---(Bridge DMZ)---[VM2]---(Bridge LAN)---LAN
The VMs side connected on physical interface (WAN and LAN) has the
normal config. The side on bridge DMZ has any number of VMs limited
by the hardware attached with dummy if. I have some delay here, but
it's not noticiable.
In the physical world, if I hook two subnets to a linux box with
two ethernet cards, all I need is some routing commands on that
gateway box, and the subnets can talk to one another.
Yes I did this too.
In the virtual world, I'm thinking the simplest to understand
equivalent is to create a dummy ethernet interface in
/etc/network/interfaces so it gets brought up as soon as the
Dom0 boots.
Then tell the standard network-bridge script to use the dummy
interface as the "netdev", but other than that, use the default
bridge scripts (including the default vif-bridge).
If I'm even close to understanding this now, the original physical
eth0 on the Dom0 will be completely left alone by xen, and if I setup
static routes between it and the dummy ehternet, then my physical
and virtual subnets will be able to talk just like in the
two physical subnet case.
Does this make any sense at all? Am I pointing in a direction
that might work?
Thanks for any insight you can provide.
(I'm not interested in firewalls and NAT and that other brain
exploding nonsense yet, I just want to see the simplest case
working first :-).
You in the right way. I almost explode my brain in the first time,
and I stay one week inside this problem. But now, its appear to be
all right.
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