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Hi, I'm currently having a bizarre issue with my Xen setup where one of my VMs can see the outside network, but the other is isolated despite having an almost-identical ...
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  1. 02-27-2011 #1
    DoddyUK
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    [SOLVED] Xen Network Bridging Issue for two guests

    Hi,
    I'm currently having a bizarre issue with my Xen setup where one of my VMs can see the outside network, but the other is isolated despite having an almost-identical setup. I'm running Debian Squeeze on Dom0, with all traffic being bridged through eth0.

    Network setup
    Dom0 - 192.168.1.210 (Debian Squeeze)
    iris.home - 192.168.2.211 (Ubuntu 10.10, Working)
    erica.home - 192.168.1.213 (Debian Lenny, Isolated)

    ifconfig on Dom0
    Code:
    eth0      Link encap:Ethernet  HWaddr 00:1e:8c:6b:ea:db  
          inet addr:192.168.1.210  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::21e:8cff:fe6b:eadb/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:256791 errors:0 dropped:0 overruns:0 frame:0
          TX packets:372897 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:50615287 (48.2 MiB)  TX bytes:223610143 (213.2 MiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:13788 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13788 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2612307 (2.4 MiB)  TX bytes:2612307 (2.4 MiB)

peth0     Link encap:Ethernet  HWaddr 00:1e:8c:6b:ea:db  
          inet6 addr: fe80::21e:8cff:fe6b:eadb/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:257860 errors:0 dropped:0 overruns:0 frame:0
          TX packets:440896 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:54458170 (51.9 MiB)  TX bytes:228229645 (217.6 MiB)
          Interrupt:23 Base address:0xc000 

vif10.0   Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff  
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:6 errors:0 dropped:0 overruns:0 frame:0
          TX packets:560 errors:0 dropped:15 overruns:0 carrier:0
          collisions:0 txqueuelen:32 
          RX bytes:392 (392.0 B)  TX bytes:87922 (85.8 KiB)

vif9.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff  
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:119 errors:0 dropped:454 overruns:0 carrier:0
          collisions:0 txqueuelen:32 
          RX bytes:0 (0.0 B)  TX bytes:18462 (18.0 KiB)
    brctl on Dom0
    Code:
    bridge name	bridge id		STP enabled	interfaces
eth0		8000.001e8c6beadb	no        		peth0
					                  		vif10.0
						                 	vif9.0
    xend-config.sxp (only the uncommented bits)
    Code:
    #
# Xend configuration file.
#

(network-script 'network-bridge netdev=eth0')
(vif-script vif-bridge)

(dom0-min-mem 128)
(enable-dom0-ballooning yes)
(total_available_memory 0) 

(dom0-cpus 0)
(vncpasswd '')
    iris.home.cfg
    Code:
    #
#  Kernel + memory size
#

bootloader = '/usr/lib/xen-default/bin/pygrub'

vcpus       = '1'
memory      = '128'

#
#  Disk device(s).
#
root        = '/dev/xvda2 ro'
disk        = [
                  'file:/vserver/images/domains/iris.home/disk.img,xvda2,w',
                  'file:/vserver/images/domains/iris.home/swap.img,xvda1,w',
              ]

#
#  Hostname
#
name        = 'iris.home'

#
#  Networking
#
vif         = [ 'ip=192.168.1.211' ]

#
#  Behaviour
#
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'
    erica.home.cfg
    Code:
    #
#  Kernel + memory size
#
kernel      = '/boot/vmlinuz-2.6.32-bpo.5-xen-686'
ramdisk     = '/boot/initrd.img-2.6.32-bpo.5-xen-686'

vcpus       = '1'
memory      = '256'

#
#  Disk device(s).
#
root        = '/dev/xvda2 ro'
disk        = [
                  'file:/xen/domains/erica.home/disk.img,xvda2,w',
                  'file:/xen/domains/erica.home/swap.img,xvda1,w',
              ]

#
#  Hostname
#
name        = 'erica.home'

#
#  Networking
#
vif         = [ 'ip=192.168.1.213,mac=00:16:3E:B8:6A:30,bridge=eth0' ]

#
#  Behaviour
#
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'
    erica: /etc/network/interfaces
    Code:
    # The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
 address 192.168.1.213
 gateway 192.168.1.1
 netmask 255.255.255.0
    iris.home /etc/network/interfaces
    Code:
    # The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
 address 192.168.1.211
 gateway 192.168.1.1
 netmask 255.255.255.0
    -------------------

    I'm pretty stumped as to what's going on, so any help would be greatly appreciated.
  2. 03-01-2011 #2
    Kloschüssel
    Kloschüssel is offline
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    erica is the one that doesn't work, so I'll make a good guess here: may this line is wrong?

    vif = [ 'ip=192.168.1.213,mac=00:16:3E:B8:6A:30,bridge=eth 0' ]
    and should be read like this:

    vif = [ 'ip=192.168.1.213' ]
    just like the configuration for iris?

    beware of re-using MACs or faked MACs!
  3. 03-01-2011 #3
    DoddyUK
    DoddyUK is offline
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    Just a little update, I've got the VM communicating with the outside world, but the connection isn't stable. If I try to connect to it, i.e. via SSH or to the Minecraft server inside it, it sometimes ends up dropping off the face of the earth and I have to use /etc/init.d/xendomains restart to restore it.

    Here's my current setup:
    Dom0 /etc/network/interfaces
    Code:
    # The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto xenbr0
iface xenbr0 inet static
        bridge_ports regex (eth|vif).* noregex
        address 192.168.1.210
        netmask 255.255.255.0
        gateway 192.168.1.1
    xend-config.sxp
    Code:
    #
# Xend configuration file.
#

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

(dom0-min-mem 128)
(enable-dom0-ballooning yes)
(total_available_memory 0) 

(dom0-cpus 0)
(vncpasswd '')
    erica.home.cfg
    Code:
    #
#  Kernel + memory size
#
kernel      = '/boot/vmlinuz-2.6.32-bpo.5-xen-686'
ramdisk     = '/boot/initrd.img-2.6.32-bpo.5-xen-686'

vcpus       = '1'
memory      = '256'

#
#  Disk device(s).
#
root        = '/dev/xvda2 ro'
disk        = [
                  'file:/xen/domains/erica.home/disk.img,xvda2,w',
                  'file:/xen/domains/erica.home/swap.img,xvda1,w',
              ]


#
#  Physical volumes
#


#
#  Hostname
#
name        = 'erica.home'

#
#  Networking
#
vif         = [ 'ip=192.168.1.213, bridge=xenbr0' ]

#
#  Behaviour
#
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'
    So, I've made much more progress compared to my first post, but is there any way I can make my connection more stable?
  4. 03-01-2011 #4
    DoddyUK
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    Right, looks like that second setup is correct. Turns out my problem was caused by BOINC using up too much CPU time! All's working perfectly now.
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