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