[Xen-users] Re: Unable to have more than 3 interfaces in domU

[Anders Siverby <ampe83@xxxxxxxxx>]

I noticed that vif2.3 isn't up, looks like the problem is in dom0 after 
all.
vif2.2    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:5 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:84 (84.0 b)  TX bytes:0 (0.0 b)

vif2.3    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:3 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

Also, if I destroy domain 2 vif2.3 still shows up and is still attached 
to switch4 (while vif2.0-2.2 is gone). I think I saw a post about this 
earlier but I can't find it now.
I am using Xen 3.0. What am I doing wrong?

/Anders

Anders Siverby wrote:
> I am not able to give more than 3 interfaces to domU. If I specify 4 
> vif=... to xm create, ifconfig -a in domU will only see eth0, eth1 and 
> eth2.
> Config file:
>
> kernel = "/boot/vmlinuz-2.6.12.6-xenU"
> memory = 20
> disk = ['cow:/mnt/cdrom/crab-domU.img 30,hda1,w']
> root = "/dev/hda1 ro"
>
> startscript for domU:
>
> brctl addbr switch1
> brctl addbr switch2
> brctl addbr switch3
> brctl addbr switch4
> ifconfig switch1 up
> ifconfig switch2 up
> ifconfig switch3 up
> ifconfig switch4 up
>
> xm create -c /crab/.xen/crab-domU.cfg name=test vif=bridge=switch1 
> vif=bridge=switch2 vif=bridge=switch3 vif=bridge=switch4
> The dom0 part of the network seem to be set up correctly:
> #brctl show
> bridge name     bridge id               STP enabled     interfaces
> switch1         8000.feffffffffff       no              vif2.0
> switch2         8000.feffffffffff       no              vif2.1
> switch3         8000.feffffffffff       no              vif2.2
> switch4         8000.feffffffffff       no              vif2.3
> xenbr0          8000.feffffffffff       no              peth0
>                                                         vif0.0
>
> Could there be some limitation in the xenU kernel or am I missing 
> something else?
> We are developing a router simulator that runs Quagga in every domU, is 
> there a better way to simulate a serial link between two routers than to 
> use a bridge?
> /Anders

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