Re: [Xen-users] Trouble creating DomU with 2 NICs

[Mike Wright <mike.wright@xxxxxxxxxxxxxx>]

07/04/2013 11:23 AM, Alan McKay wrote:
> Hey folks,
>
> I created a DomU, installed Linux, and then realized I'd only given it
> 1 NIC so brought it down to edit the cfg file to give it another NIC.
>
> Originally I just had :
>
> vif = ['']
>
> And so I guess the defaults worked for the 1 NIC.   So I changed it to :
>
> vif = 
> ['mac=00:1e:68:8e:31:b8,bridge=xenbr0','mac=00:1e:68:8e:31:b9,bridge=xenbr1']
>
> Where those MAC addresses are from the bridge in dom0, as seen here :
>
> My Dom0 has :
>
> eth0      Link encap:Ethernet  HWaddr 00:1e:68:8e:31:b8
>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>            RX packets:524414 errors:0 dropped:0 overruns:0 frame:0
>            TX packets:519320 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:450798894 (450.7 MB)  TX bytes:362453554 (362.4 MB)
>            Interrupt:18 Memory:dffe0000-e0000000
>
> eth1      Link encap:Ethernet  HWaddr 00:1e:68:8e:31:b9
>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>            RX packets:126552 errors:0 dropped:395 overruns:0 frame:0
>            TX packets:188670 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:15672743 (15.6 MB)  TX bytes:234429457 (234.4 MB)
>            Interrupt:19 Memory:dffa0000-dffc0000
Your virtual interfaces (vif) have been given the macs of actual 
interfaces and is causing a collision.  The domU will always lose that 
battle.
Change your vif line to use arbitrary macs in the Xen OUI space 
(00:16:e3).  Doesn't HAVE to be in that space but I think it's a good habit.
vif = [
  'mac=00:16:3e:xx:yy:zz,bridge=xenbr0',
  'mac=00:16:3e:aa:bb:cc,bridge=xenbr1'
]


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