[Xen-users] xen networking troubles

["Sebastian Reitenbach" <sebastia@xxxxxxxxxxxxxxxxxxxx>]

Hi,

I want to switch my server into a Xen instance.

Right now there are 10 vlans ending up at the server. For each service that 
the server provides, there is an alias IP address on each of the vlan 
interfaces to serve the clients.

I want ot install xen, and divide the services into 4 virtual nodes. The 
dom0 machine has three network interfaces, eth0, eth1, eth2. eth0 and eth1 
are bonded together to serve the clients, eth2 is intended for the virtual 
machines, to NFS mount needed remote filesystems.

I want to do this on sles10sp1 x86_64. This distri comes with xen 3.0.4.
The best thing I think would be if I create a bridge for each vlan, and then 
let the domU's connect to each of the needed bridges. But xen 3.0. does only 
support up to three? (at least not enough) interfaces per domU, and 
therefore this is not possible.

Setup routing is also not working for me, because the server is not "behind" 
the default gw of the clients, nor I do want to route all the traffic of the 
clients through the firewall.

So there is more or less only NAT as the possible answer.

Then I need to configure bond0, with 10 vlan interfaces on top of it. Each 
vlan interface will have an alias IP address for each service the virtual 
nodes should provide. Then when traffic arrives on a given alias address on 
a given vlan, the traffic should be redirected to a given destination domU.

After taking a closer look into the scripts, I am not sure, whether xen can 
help me with its interal network scripts at all.

I commented out all network-script and  vif-script 
in /etc/xen/xend-config.sxp. But after reboot, I still have 12 bridges 
created by rcxend start. After a bit wondering, I figured out that bridge is 
default when nothing else is speicified. However, I do not have a vif0.0, 
nor a peth0 interface in the domU ifconfig output. Also a brctl show shows 
that all bridges have no interfaces assigned.



I don't know, whether the xen network-scripts/vif-scripts can do this for 
me, if so, can someone please point me to xen network documentation that 
covers more than the most basic stuff?

Or, if not, do I can stop xend from creating these bridge interfaces, so 
that I can create own firewall script to configure the NAT as I want (hope) 
it will work?


The virtual interfaces as seen from the dom0 for the domU's are named 
dynamically. Is there a way to force these to the name of the domU? e.g. one 
of my domUs is named FTP, another one DNS. do I can name the virtual 
Interfaces for one domain FTP.0, FTP.1 ... and for the other DNS.0 
DNS.1, ...
Do I can do this in the VM config files below /etc/xen/vm in the vif 
statement somehow?

I hope it is understandable, what I want to do, if not, let me kow, I'd be 
happy to provide more information.

kind regards
Sebastian


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