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Hi folks, Ubuntu 6.06 server amd64 - guest Ubuntu 8.04 server amd64 - host KVM Guest can run "apt-get update/upgrade" but unable to ping Internet/gateway/host, 100% package loss $ telnet ...
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  1. #1
    Linux Guru
    Join Date
    Sep 2004
    Posts
    1,814

    Guest OS can't ping Internet


    Hi folks,


    Ubuntu 6.06 server amd64 - guest
    Ubuntu 8.04 server amd64 - host
    KVM


    Guest can run "apt-get update/upgrade" but unable to ping Internet/gateway/host, 100% package loss


    $ telnet localhost 25
    Code:
    Trying 127.0.0.1....
    telnet: Unable to connect to remote host: Connection refused.

    Guest;

    $ cat /etc/network/interfaces
    Code:
    auto lo
    iface lo inet loopback
    
    auto eth0
    iface eth0 inet dhcp

    $ ifconfig
    Code:
    eth0	  Link encap:Ethernet  HWaddr 52:54:00:12:34:56
    	  inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
    	  inet6 addr: fe80::5054:ff:fe12:3456/64 Scope:Link
    	  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
    	  RX packets:175 errors:0 dropped:0 overruns:0 frame:0
    	  TX packets:249 errors:0 dropped:0 overruns:0 carrier:0
    	  collisions:0 txqueuelen:1000
    	  RX bytes:31829 (31.0 KiB)  TX bytes:31819 (31.0 KiB)
    	  Interrupt:11 Base address:0x6000
    
    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:41 errors:0 dropped:0 overruns:0 frame:0
    	  TX packets:41 errors:0 dropped:0 overruns:0 carrier:0
    	  collisions:0 txqueuelen:0
    	  RX bytes:3156 (3.0 KiB)  TX bytes:3156 (3.0 KiB)

    Host;

    $ cat /etc/network/interfaces
    Code:
    auto lo
    iface lo inet loopback
    
    
    auto eth0
    iface eth0 inet manual
    
    
    # The primary network interface
    auto br0
    iface br0 inet static
            address 192.168.0.110
            netmask 255.255.255.0
            network 192.168.0.0
            broadcast 192.168.0.255
            gateway 192.168.0.1
            bridge_ports eth0
            bridge_fd 9
            bridge_hello 2
            bridge_maxage 12
            bridge_stp off

    $ ifconfig
    Code:
    br0       Link encap:Ethernet  HWaddr 00:0e:a6:f9:a3:5b
              inet addr:192.168.0.110  Bcast:192.168.0.255  Mask:255.255.255.0
              inet6 addr: fe80::20e:a6ff:fef9:a35b/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:53674 errors:0 dropped:0 overruns:0 frame:0
              TX packets:85945 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:3310146 (3.1 MB)  TX bytes:19758025 (18.8 MB)
    
    eth0      Link encap:Ethernet  HWaddr 00:0e:a6:f9:a3:5b
              inet6 addr: fe80::20e:a6ff:fef9:a35b/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:53674 errors:0 dropped:0 overruns:0 frame:0
              TX packets:85946 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:4061600 (3.8 MB)  TX bytes:20372743 (19.4 MB)
              Interrupt:249 Base address:0x2000
    
    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:84 errors:0 dropped:0 overruns:0 frame:0
              TX packets:84 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:7462 (7.2 KB)  TX bytes:7462 (7.2 KB)
    
    vnet0     Link encap:Ethernet  HWaddr 4a:e2:d1:69:60:1b
              inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
              inet6 addr: fe80::48e2:d1ff:fe69:601b/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:0 (0.0 B)  TX bytes:468 (468.0 B)

    Please advise how to fix the problem. TIA


    Remark: Iptables is NOT running


    B.R.
    satimis

  2. #2
    Linux Guru coopstah13's Avatar
    Join Date
    Nov 2007
    Location
    NH, USA
    Posts
    3,149
    sounds like dns problem, post exact error and
    Code:
    cat /etc/resolv.conf

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