Re: [Xen-users] Emulating Multiple NIC cards on Guests

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Viswanath T K wrote:
> Hi All,
>
> I have a x86 64bit Machine on which I run fedora 7 64bit.
> I have 3 NIC cards on the machine. Now I want to create 2
> paravirtualised guests with fedora 7 64 bit as the OS.
> My objective is I want the guests also to emulate or show the 3 NIC
> cards which are present on the host or dom0 . At present I am using
> virt-manager to create the guests and on doing the regular process, the
> 3 NIC cards are not shown on the guests.
>   
The default xen dom0 configuration creates only a single bridge and the 
default guest configuration only creates a single virtual ethernet 
interface on the guest. Solution for you would be something below.
- In /etc/sysconfig/network-scripts of dom0 , Configure eth0, eth1 and 
eth3 with appropriate network details.
- Edit /etc/xen/xend-config.sxp, comment out Line 91 by putting a # in 
the beginning of the line and add the below line after that.
(network-script network-custom)

- Crate /etc/xen/scripts/network-custom with the below contents in it 
and give it 755 permission.
#!/bin/bash
/etc/xen/scripts/network-bridge $1 netdev=eth0 bridge=xenbr0 vifnum=0
/etc/xen/scripts/network-bridge $1 netdev=eth1 bridge=xenbr1 vifnum=1
/etc/xen/scripts/network-bridge $1 netdev=eth2 bridge=xenbr2 vifnum=2

- Reboot your system.

- Now you should have xenbr0, xenbr1 and xenbr2 configured properly on 
your host system. Run "brctl show" to see details.
Now if you want to start a guest with three virtual interfaces, Edit the 
guest configuration file in /etc/xen/<guest name> and change vif= 
parameter as below.
vif = [ 
"mac=00:16:3e:7b:0e:a4,bridge=xenbr0,script=vif-bridge","mac=00:16:3e:7b:0e:a5,bridge=xenbr1,script=vif-bridge" 
,"mac=00:16:3e:7b:0e:a6,bridge=xenbr2,script=vif-bridge"]
This would create three virtual ethernet interfaces - eth0, eth1 and 
eth2 - in the guest where eth0 would be bridged to xenbr0, eth1 to 
xenbr1 and eth2 to xenbr2. Then configure these virtual interfaces in 
the guest as you usually do with a physical system. If eth0, eth1 and 
eth2 in dom0 are connected to separate subnets and if you configure 
these three virtual ethernets in the guest to obtain their ip addresses 
from dhcp, then they should have obtained an ip address from the 
respective dhcp servers when you restart network service in the guest. 
Please make sure that the mac address you assign is unique.
The above vif = entry is for a para-virtualized guest. If it's a fully 
virtualized guest, it should be as below.
vif = [ 'type=ioemu, mac=00:16:3e:04:98:04, bridge=xenbr0','type=ioemu, 
mac=00:16:3e:04:98:05, bridge=xenbr1','type=ioemu, 
mac=00:16:3e:04:98:06, bridge=xenbr2' ]
--Sadique

> Can somebody help me on how to go about this .
>
>
> Thanks ,
> Vishu
>
>
>
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>
>   

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