Hetzner, kvm and connection lost

Discussion in 'Server Operation' started by Stoned, Feb 9, 2010.

  1. Stoned

    Stoned New Member

    Hi everyone !
    Sorry for my very bad english :D
    I tried to install kvm for virtualization on a Hetzner EQ4 server and i would like to use the 3 addtional ip for 3 virtual machine..but i have a little problem: the virtual machine seem to working fine, it take the assigned ip address..but after some minutes it lost connection! The virtual machine continue to work, but without connection: i try to connect them using vnc through ssh tunnel on the host machine, and i can login, but there isn't external connection.
    The machine is unreachable also from host machine.
    So, after some minutes, the network restart to working always for some minutes, then i lost the connection again.
    The connection with host server workin always fine.
    This is my configuration:
    Host : Debian minimal (with only package kvm libvirt-bin virtinst bridge-utils fail2ban vim-nox)
    Guest : Debian Lenny installed with virt-install
    I modified only /etc/sysctl.conf that actualy is
    Code:
    net.ipv4.conf.all.rp_filter=1
    net.ipv4.icmp_echo_ignore_broadcasts=1
    
    net.ipv4.ip_forward=1
    net.ipv6.conf.all.forwarding=1
    net.ipv4.conf.default.proxy_arp=1
    
    and /etc/network/interfaces that actualy is
    Code:
    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).
    
    # The loopback network interface
    auto lo
    iface lo inet loopback
    
    # The primary network interface
    #allow-hotplug eth0
    #iface eth0 inet dhcp
    auto eth0
    iface eth0 inet manual
    
    auto br0
    iface br0 inet static
    	address   xxx.xxx.xxx.106
    	broadcast xx.xxx.xxx.127
     	netmask   255.255.255.224
     	gateway   xx.xxx.xxx.97
            bridge_ports eth0
            bridge_fd 9
            bridge_hello 2
            bridge_maxage 12
            bridge_stp off
    
    All other file are untoched
    On virtual machine i assigned the new ip (xx.xxx.xxx.117) and the host address as gateway (xxx.xxx.xxx.106)
    my ifconfig return
    Code:
    br0      Link encap:Ethernet  HWaddr bb:bb:bb:bb:bb:bb  
              inet addr:xxx.xxx.xxx.106  Bcast:xxx.xxx.xxx.127  Mask:255.255.255.224
              inet6 addr: yyyy::yyyy:yyyy:yyyy:yyyy/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:1670 errors:0 dropped:0 overruns:0 frame:0
              TX packets:1369 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:143571 (140.2 KiB)  TX bytes:189891 (185.4 KiB)
    
    eth0      Link encap:Ethernet  HWaddr aa:aa:aa:aa:aa:aa  
              inet6 addr: yyyy::yyyy:yyyy:yyyy:yyyy/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:1615 errors:0 dropped:0 overruns:0 frame:0
              TX packets:997 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:146089 (142.6 KiB)  TX bytes:149866 (146.3 KiB)
              Interrupt:250 Base address:0x8000 
    
    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:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
    
    vnet0     Link encap:Ethernet  HWaddr bb:bb:bb:bb:bb:bb  
              inet6 addr: zzzz::zzzz:zzzz:zzzz:zzzz/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:374 errors:0 dropped:0 overruns:0 frame:0
              TX packets:651 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:500 
              RX bytes:47999 (46.8 KiB)  TX bytes:61678 (60.2 KiB)
    
    It's normal that br0 and vnet0 had the same mac address ? On my local server, br0 always had eth0 mac address...

    Someone can help me ?
     
  2. Stoned

    Stoned New Member

    I don't know if it's the cause or the consequence, but when i lost connection i can see on the /var/log/messages of host system
    Code:
    Feb  9 16:52:31 server1 kernel: [  897.631377] eth0: received packet with  own address as source address
    
    
     

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