[Xen-users] Network Issues/Questions

[Markus Gerber <markus@xxxxxxxxxxxxx>]

Hello, 

I'm new to Xen (and this mailing-list) and facing some problems with   
the network. I'm stuck and don't know how to continue. And Google   
isn't very helpful either... 

My setup: 
- Ubuntu 7.10 for dom0 and Debian 4.0 for all domU 
- 4 physical NIC (DHCP from my ISP, internal LAN, DMZ & WLAN) 
- 1 Dom as firewall/router 
- 1 domU with internal services (DHCP-, LDAP-, SAMBA-, ... Server) 
- 1 domU in DMZ as Webserver 

My plan: 
- xenbr0 where eth0 is in it and all my internal domX 
- xenbr1 where eth1 is in it and all my DMZ domX 
- xenbr2 where eth2 is in it (WLAN Access Point attached) 
- xenbr3 where eth0, eth1, eth2 and eth3 for the firewall 

What I have so far: 
- Xen installed and dom0 running 
- xenbr0, xenbr1, xenbr2 and xenbr3 created via custom script: 
   #!/bin/sh 
   dir=$(dirname "$0") 
   "$dir/network-bridge" "$@" vifnum=0 netdev=eth0 bridge=xenbr0 
   "$dir/network-bridge" "$@" vifnum=1 netdev=eth1 bridge=xenbr1 
   "$dir/network-bridge" "$@" vifnum=2 netdev=eth2 bridge=xenbr2 
   "$dir/network-bridge" "$@" vifnum=3 netdev=eth3 bridge=xenbr3 
- dom1 with eth0 in it for testing with an internal machine 
- dom2 with eth0-eth3 for the router/firewall (Both of them I start   
manually) 

My problems: 
- When I reboot dom0, I get eth4 instead of eth0, eth5 instead of eth1   
and eth6 instead of eth2. The bridges are created but no interfaces   
are attached of course. I then have to put eth4's mac-address to eth0,   
etc. and reboot again, to get eth0 - eth3 and the bridges. It never   
change eth3's mac-address (where my cable-modem is attached to). What   
did I do wrong that I have this behavior? Or is this 'as designed'? 

My questions: 
- What's the configuration for /etc/network/interfaces in dom0? So far   
I have a fixed IP for eth0-eth2 and DHCP for eth3. Is this correct? 
- Where do I have to configure DHCP? On eth3 in dom0, on xenbr3 or on   
eth3 in domU of the firewall? 
- Do I need to have the real Mac-Address on the physical eth0-eth3 and   
Xen moves them to the right places or do I need to put em in the vif- 
statement of each domU? 
- Do the bridges need to have an IP-Address? 
- What would be the best approached for remote accessing dom0? Through   
an internal domX? 


Uff, so many questions... 

Thank you in advance for your tips and your help! 

Regards, 
Markus 


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