Andreas Rittershofer napsal(a):
Am 26.02.2009 um 20:26 schrieb Radek Hladik:
Andreas Rittershofer napsal(a):
My problem is:
1.) VM1 running on host A must have network access to VM3 when VM3 is
running on host B by default _and_
2.) when VM3 is running on host A because host B failed.
In some of my configurations 1.) worked but 2.) not, in some other
configurations 2.) worked but 1.) not.
I must have missed some detail ...
I do not see the problem. With the bridged scenario every VM has
direct access to the physical network and it is not important on which
host it runs. If the VMs are running on the same host, their ethernet
frames will just "turn around" in the bridge interface and if they are
running on different hosts they will go thru the real ethernet.
State 1)
A: VM1
B: VM3
Eth. frames will go like this:
VM1->BrA->PhysCardA->Ethernet->PhysCardB->BrB->VM3
State 2)
A: VM1+VM3
B: x
Eth. frames will go like this:
VM1->BrA->VM3
NOW I've got it!
The errors in my configuration were two different network configurations
on host A and on host B - I always thought that the network on host A
and the network on host B must have different IP addresses. Now there is
only on network configuration for host A _and_ host B and everything is
fine!
Thank you very much for your help!
mfg ar
Glad to hear its working! All the involved machines (real and
virtualized) share the same ethernet segment so they need to have IPs
from the same range. You can even assign IPs for the VMs via DHCP
server, etc.
Or to be more correct, you can have different network IP ranges, but
then you need to route the traffic somehow...
Radek
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