Re: [Xen-users] Multiple Network Cards + Multiple Bridges on debian lenny

[Alexander Pirsig <alex@xxxxxxxxxx>]

Hi Max,

thank you for you answer. Okay maybe I have to give more information 
about my problem with bridge setup. Let me describe my server setup first.
I have a server with 4 network cards eth0-eth3. Network interfaces 
eth1-eth3 should be bridged and connected with xen domUs. At the moment 
my /etc/network/interfaces on Dom0 looks like this:
# The primary network interface
auto eth0
iface eth0 inet static
  address 192.168.0.158
  netmask 255.255.255.0
  network 192.168.0.0
  broadcast 192.168.0.255
  gateway 192.168.0.2
  dns-nameservers 192.168.0.88


# eth1 -> intern 1
auto eth1
iface eth1 inet static
       up ifconfig eth1 0.0.0.0 up

# eth1 -> xenbr1
auto xenbr1
iface xenbr1 inet manual
       bridge_ports eth1
       down ifconfig xenbr1 down
       post-down brctl delbr xenbr1

# eth2 -> intern 2
auto eth1
iface eth1 inet static
       up ifconfig eth1 0.0.0.0 up

# eth2 -> xenbr2
auto xenbr2
iface xenbr2 inet manual
       bridge_ports eth2
       down ifconfig xenbr2 down
       post-down brctl delbr xenbr2

and so on.... in my /etc/xen/xend-config.sxp I have the following entries

(network-script network-dummy)
# (vif-script vif-bridge)

Then I configured networking for my DomU's like this:

#
#  Networking
#
vif  = [ 'ip=192.168.0.173,bridge=xenbr1' ]

Bridge config on Dom0 looks like this:

xenbr1          8000.001b213b8a69       no              eth1
                                                       vif6.0
xenbr2          8000.001b213b8a6c       no              eth2
                                                       vif1.0
                                                       vif7.0
xenbr3          8000.001b213b8a6d       no              eth3
                                                       vif2.0

Yesterday I discovered that sometimes during Highload on DomU's part of 
the network is hard rechable with ssh or connections stalls even if I 
try to connect to dom0 with has seperate uplink.
checking arp sometimes shows strange information (during highload) like:

arp -na
? (192.168.0.158) at 00:1b:21:3b:8a:68 [ether] on eth0
? (192.168.0.158) at 00:1b:21:3b:8a:68[ether] on xenbr1

So my question are:

1. Is it normal that bridge xenbr1 claims ip mac address of eth1?
2. Do I have to reset mac address on the bridge (xenbr1) or network 
interface (eth1) to FF:FF:FF:FF bevor starting it.
3. What could cause the problem with the arp table?
4. Do I have to turn of  arp/multicast on eth1 or xenbr1 like this ->
   ip link set xenbr1 arp off
   ip link set xenbr1 multicast off

Regards,

Alex

Maximilian Wilhelm wrote:
> Anno domini 2009 Alexander Pirsig scripsit:
>
> Hi!
>
>   
> > I'm searching for a tutorial how to setup multiple network cards with
> > xen network bridge setup in debian lenny. My problem is, bridges seams
> > only to work if i put an ip adress in dom0 to them.
> >     
> Can you be a bit more specific about your problem?
>
> When you have install the bridge-utils package, which is required for
> configuring bridges on Debian, you can put stanzas like this into the
> /etc/network/interfaces file:
>
>
> auto br123
> iface br123 inet manual
>         bridge_ports eth42
>         bridge_stp no
>         bridge_fd 2
>
> This will setup the bridge 'br123' and attach the physical NIC 'eth42'
> to it, which practically means you have a virtual switch inside your
> Dom0 where you can plug DomUs in. Dom0 will not be able to directly
> communicate with them, though.
>
> If you want your Dom0 to be part of this network, you have to
> configure an IP address on the bridge which can be done like this:
>
> auto br123
> iface br123 inet static
>         addresss 10.0.123.42
>         netmask 255.255.255.0
>         bridge_ports eth42
>         bridge_stp no
>         bridge_fd 2
>
> Beware of the 'static' vs. 'manual' thing.
>
>
> If you are using VLANs you can go one step further an do something
> like this (package vlan required)
>
> auto eth0
> iface eth0 inet manual
>         post-up ifconfig eth0 0.0.0.0 up
>         pre-down ifconfig eth0 0.0.0.0 down
>
> auto eth0.123
> iface eth0.123 inet manual
>         vlan_raw_device eth0
>         post-up ifconfig $IFACE 0.0.0.0 up
>         pre-down ifconfig $IFACE 0.0.0.0 down
>
> auto br123
> iface br123 inet static
>         addresss 10.0.123.42
>         netmask 255.255.255.0
>         bridge_ports eth0.123
>         bridge_stp no
>         bridge_fd 2
>
>
> HTH
> Ciao
> Max
>   

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