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Thread: Sometimes Suse loosing connection

  1. #1

    Default Sometimes Suse loosing connection

    Hello,

    I'm dummy in linux world and maybe someone can help? Installed Opensuse 11.4 64bit on Hyper-V virtual machine all is working fine except sometimes lan connection is lost.
    Code:
    /etc/init.d/network restart
    is not helping and I need manual reboot.
    Why that? What's problem?

    In routes table I can see default gw.

    Code:
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
    178.16.16.192   *               255.255.255.192 U     0      0        0 eth0
    link-local      *               255.255.0.0     U     0      0        0 eth0
    loopback        *               255.0.0.0       U     0      0        0 lo
    default         178.16.16.193   0.0.0.0         UG    0      0        0 eth0

  2. #2
    Join Date
    Sep 2010
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    Poland
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    Default Re: Sometimes Suse loosing connection

    We need some more information to help You. Does this VM has internet access ? If yes please provide outputs of ping commands to 8.8.4.4 and for example lwn.net.

    Are You using ipv6 ?

    Are You using NetworkManager or ifup ?

    Best regards,
    Greg
    Best regards,
    Greg

  3. #3

    Default Re: Sometimes Suse loosing connection

    Yes, VM is having access to internet.

    Code:
    xxx:~ # ping 8.8.4.4
    PING 8.8.4.4 (8.8.4.4) 56(84) bytes of data.
    64 bytes from 8.8.4.4: icmp_req=1 ttl=55 time=42.8 ms
    64 bytes from 8.8.4.4: icmp_req=2 ttl=55 time=42.7 ms
    64 bytes from 8.8.4.4: icmp_req=3 ttl=55 time=42.6 ms
    64 bytes from 8.8.4.4: icmp_req=4 ttl=55 time=43.7 ms
    ^C
    --- 8.8.4.4 ping statistics ---
    4 packets transmitted, 4 received, 0% packet loss, time 3004ms
    rtt min/avg/max/mdev = 42.657/43.008/43.728/0.471 ms
    Code:
    xxx:~ # ping lwn.net
    PING lwn.net (72.51.34.34) 56(84) bytes of data.
    64 bytes from sb.lwn.net (72.51.34.34): icmp_req=1 ttl=45 time=203 ms
    64 bytes from sb.lwn.net (72.51.34.34): icmp_req=2 ttl=45 time=204 ms
    64 bytes from sb.lwn.net (72.51.34.34): icmp_req=3 ttl=45 time=204 ms
    ^C
    --- lwn.net ping statistics ---
    3 packets transmitted, 3 received, 0% packet loss, time 1999ms
    rtt min/avg/max/mdev = 203.995/204.124/204.283/0.387 ms
    No, only IPv4. Configuration initial was made with YAST.

  4. #4
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    Default Re: Sometimes Suse loosing connection

    Quote Originally Posted by aigarspolis View Post
    Yes, VM is having access to internet.

    Code:
    xxx:~ # ping 8.8.4.4
    PING 8.8.4.4 (8.8.4.4) 56(84) bytes of data.
    64 bytes from 8.8.4.4: icmp_req=1 ttl=55 time=42.8 ms
    64 bytes from 8.8.4.4: icmp_req=2 ttl=55 time=42.7 ms
    64 bytes from 8.8.4.4: icmp_req=3 ttl=55 time=42.6 ms
    64 bytes from 8.8.4.4: icmp_req=4 ttl=55 time=43.7 ms
    ^C
    --- 8.8.4.4 ping statistics ---
    4 packets transmitted, 4 received, 0% packet loss, time 3004ms
    rtt min/avg/max/mdev = 42.657/43.008/43.728/0.471 ms
    Code:
    xxx:~ # ping lwn.net
    PING lwn.net (72.51.34.34) 56(84) bytes of data.
    64 bytes from sb.lwn.net (72.51.34.34): icmp_req=1 ttl=45 time=203 ms
    64 bytes from sb.lwn.net (72.51.34.34): icmp_req=2 ttl=45 time=204 ms
    64 bytes from sb.lwn.net (72.51.34.34): icmp_req=3 ttl=45 time=204 ms
    ^C
    --- lwn.net ping statistics ---
    3 packets transmitted, 3 received, 0% packet loss, time 1999ms
    rtt min/avg/max/mdev = 203.995/204.124/204.283/0.387 ms
    No, only IPv4. Configuration initial was made with YAST.
    What I meant was the output of those commands when You don't have the connection. In fact doing a traceroute might be even better

    Best regards,
    Greg
    Best regards,
    Greg

  5. #5

    Default Re: Sometimes Suse loosing connection

    Hello,

    There is output form commands. What you expecting to see there ?
    Can anyone help?


  6. #6
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    Default Re: Sometimes Suse loosing connection

    Quote Originally Posted by aigarspolis View Post
    Hello,

    There is output form commands. What you expecting to see there ?
    Can anyone help?

    I think the Destination Host Unreachable might mean it's a Hyper-V problem. Do You have other VMs running as well ? Can they access internet while openSUSE can't ?

    Best regards,
    Greg
    Best regards,
    Greg

  7. #7

    Default Re: Sometimes Suse loosing connection

    Yes, I have other VM runing, but problems only with this installation. There is only one difference all others hosts are windows servers. It's possible to find out why it's happening and so it's actually Hyper-V problem?
    Thanks!

  8. #8
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    Default Re: Sometimes Suse loosing connection

    Quote Originally Posted by aigarspolis View Post
    Yes, I have other VM runing, but problems only with this installation. There is only one difference all others hosts are windows servers. It's possible to find out why it's happening and so it's actually Hyper-V problem?
    Thanks!
    I'm sure there is but I know nothing about Hyper-V so I can't help You with that
    Anyway if the windows hosts don't lose the internet than I guess some interaction between Hyper-V nad openSUSE is to blame.

    Can You answer my question about using ifup or NetworkManager ?
    If not sure read this :
    Novell Documentation

    If You're using NetworkManager switch to ifup and see if the problem persists.

    Best regards,
    Greg
    Best regards,
    Greg

  9. #9

    Default Re: Sometimes Suse loosing connection

    Ok

    I'm using ifup. Do I need switch to network manager?
    Thanks!

  10. #10
    Join Date
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    Default Re: Sometimes Suse loosing connection

    Quote Originally Posted by aigarspolis View Post
    Ok

    I'm using ifup. Do I need switch to network manager?
    Thanks!
    I think it should work better with ifup but if it's causing problems trying NetworkManager won't hurt. So yes please try this.

    Another thing You might do is post the contents of your interface configuration file. Maybe there is an error there. The files are stored in /etc/sysconfig/network/
    You need to paste the contents of the proper file here so it should be ifcfg-eht0 if the interface is called eth0 as shown by the terminal command ifconfig.

    Best regards,
    Greg
    Best regards,
    Greg

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