[Xen-users] Server with 2 NICS; connect domU to outside & vlan

["Ferreira, N. L. (Nuno)" <n.l.ferreira@xxxxx>]

Hi *

First of all, let me say that I  have almost no knowledge about how 
networks works. I must fill this gap soon.
So, don't feel obliged to completely answer my question(s). I only 
expect some tips/clues to start with.
What I have:
1) A dom0 server with 2 NIC cards (eth0, eth1), running centOS52 xen 3.2.
2) A switch to a VLAN with several physical machines (already up and 
running).
What I need:
1) A domU with a static IP and also connected to the VLAN.

My plan:
1) use dom0 eth0 to connect to the outside world; domU will use it also 
to connect to the outside (this is the default anyway).
2) use dom0 eth1 to connect domU to the switch connected to the VLAN.

Do not know if this makes much sense, it makes to me at least,.

My progress:
Till now, all my created domU's (each with a static IP) were connecting 
to the web through xenbr0. The second NIC on dom0 was not being used at 
all. The xen config file pointed to xenbr0, and I only had to change 
inside the domU the network configurations (/etc/sysconfig/network and 
/etc/sysconfig/network-scripts-eth0). An ifconfig on the host shows me 
the following network components (deleted not so important stuff):
[root@dom0 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:E0:81:4D:30:D0
         inet addr:132.212.155.68  Bcast:132.212.155.255  
Mask:255.255.255.0
         inet6 addr: fe80::2e0:81ff:fe4d:30d0/64 Scope:Link
        
lo        Link encap:Local Loopback
         inet addr:127.0.0.1  Mask:255.0.0.0
         inet6 addr: ::1/128 Scope:Host
        
peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
         inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
        
vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
         inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
        
virbr0    Link encap:Ethernet  HWaddr 00:00:00:00:00:00
         inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
         inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
        
xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF


If I activate the 2nd dom0 NIC and connect it to the switch of the VLAN, 
after a dom0 reboot I have:
[root@dom0 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:E0:81:4D:30:D0
         inet addr:132.212.155.68  Bcast:132.212.155.255  
Mask:255.255.255.0
         inet6 addr: fe80::2e0:81ff:fe4d:30d0/64 Scope:Link
        
eth0      Link encap:Ethernet  HWaddr 00:E0:81:4D:30:D1
         inet addr:10.0.0.49  Bcast:10.0.0.255  Mask:255.255.255.0
        
lo        Link encap:Local Loopback
         inet addr:127.0.0.1  Mask:255.0.0.0
         inet6 addr: ::1/128 Scope:Host
        
peth1     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
   
vif0.1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
        
virbr0    Link encap:Ethernet  HWaddr 00:00:00:00:00:00
         inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
         inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
        
xenbr1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
        

So it seems that the dom0 is well configured, both to the outside world 
and to the VLAN. Though I thought 2 xen bridges should appear ... one 
for each NIC card?
I booted a domU (after changing in the xen cfg file xenbr0 to xenbr1) 
created is this machine (when the eth1 was still inactivated) and I had 
problems because Kudzu detected a change in the network configuration. 
So probably, I should create the domU when both dom0 NIC cards are 
active, right?
How can I accomplish my 2 goals above on "My plans" section?
Any insights for me to start playing?

Sorry for such long e-mail, and thanks for your reading.
Cheers,
N.






--
==============================================
Nuno Ricardo Santos Loureiro da Silva Ferreira

NMR Spectroscopy Research Group
Bijvoet Center for Biomolecular Research
Utrecht University
Bloembergen gebouw
Padualaan 8, 3584 CH Utrecht
The Netherlands

P: +31.(0)30.253 9932
F: +31.(0)30.253 2652
E: n.l.ferreira@xxxxx
W: http://nmr.chem.uu.nl
==============================================


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