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Thread: no internet connection Opensuse 11.3

  1. #1

    Default no internet connection Opensuse 11.3

    Hi,

    When I tried to install OpenSUSE 11.4, my cable was plugged in and the system could not detect the network connection. I used the default network settings except disabling IPV6 in Yast and I am trying to connect to my university LAN.

    I then checked /sys/class/net/
    eth0/operstate:up
    eth0/carrier:1
    They indicated the cable was plugged in.

    The following is shown in the etc/sysconfig/network ifcfg-eth0 file:
    BOOTPROTO='dhcp4'
    BROADCAST=''
    ETHTOOL_OPTIONS=''
    IPADDR=''
    MTU=''
    NAME='NetXtreme BCM5754 Gigabit Ethernet PCI Express'
    NETMASK=''
    NETWORK=''
    REMOTE_IPADDR=''
    STARTMODE='ifplugd'
    USERCONTROL='no'
    IFPLUGD_PRIORITY='20'
    -----------------------------------------------------------------------------------------
    Other information might be needed:
    xia@linux-5s1r:~/Desktop> ip addr
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
    inet 127.0.0.2/8 brd 127.255.255.255 scope host secondary lo
    inet6 ::1/128 scope host
    valid_lft forever preferred_lft forever
    2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:1a:a0:e6:ac:46 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::21a:a0ff:fee6:ac46/64 scope link
    valid_lft forever preferred_lft forever
    3: pan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether a6:ca:b2:48:4d:b7 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::a4ca:b2ff:fe48:4db7/64 scope link
    valid_lft forever preferred_lft forever
    ----------------------------------------------------------------------------------------------
    xia@linux-5s1r:~/Desktop> ip route
    127.0.0.0/8 dev lo scope link
    ----------------------------------------------------------------------------------------------
    xia@linux-5s1r:~/Desktop> ip -s link
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    RX: bytes packets errors dropped overrun mcast
    40753 500 0 0 0 0
    TX: bytess
    ----------------------------------------------------------------------------------------------
    I then tried to re-install Opensuse 11.3 (32bit) and Opensuse 11.1 (64bit) which is the one my colleague incorrectly installed on our 32 bit machine). The same thing with those two versions.

    Any clue what is wrong here? Thanks for your help! I am new to Linux, so I may made stupid mistakes here.

    Xia

  2. #2

    Default Re: no internet connection Opensuse 11.3

    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    You don't have an IP address that matters on any NIC. Either your system
    is not requesting one or it is not receiving one from a DHCP server. Do
    other machines on your network get assigned addresses via DHCP? What do
    you have in /var/log/messages from the time you started your system?

    Good luck.





    On 04/05/2011 11:36 AM, xiazhang3 wrote:
    >
    > Hi,
    >
    > When I tried to install OpenSUSE 11.4, my cable was plugged in and the
    > system could not detect the network connection. I used the default
    > network settings except disabling IPV6 in Yast and I am trying to
    > connect to my university LAN.
    >
    > I then checked /sys/class/net/
    > eth0/operstate:up
    > eth0/carrier:1
    > They indicated the cable was plugged in.
    >
    > The following is shown in the etc/sysconfig/network ifcfg-eth0 file:
    > BOOTPROTO='dhcp4'
    > BROADCAST=''
    > ETHTOOL_OPTIONS=''
    > IPADDR=''
    > MTU=''
    > NAME='NetXtreme BCM5754 Gigabit Ethernet PCI Express'
    > NETMASK=''
    > NETWORK=''
    > REMOTE_IPADDR=''
    > STARTMODE='ifplugd'
    > USERCONTROL='no'
    > IFPLUGD_PRIORITY='20'
    > -----------------------------------------------------------------------------------------
    > Other information might be needed:
    > xia@linux-5s1r:~/Desktop> ip addr
    > 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    > link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    > inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
    > inet 127.0.0.2/8 brd 127.255.255.255 scope host secondary lo
    > inet6 ::1/128 scope host
    > valid_lft forever preferred_lft forever
    > 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
    > qlen 1000
    > link/ether 00:1a:a0:e6:ac:46 brd ff:ff:ff:ff:ff:ff
    > inet6 fe80::21a:a0ff:fee6:ac46/64 scope link
    > valid_lft forever preferred_lft forever
    > 3: pan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
    > UNKNOWN
    > link/ether a6:ca:b2:48:4d:b7 brd ff:ff:ff:ff:ff:ff
    > inet6 fe80::a4ca:b2ff:fe48:4db7/64 scope link
    > valid_lft forever preferred_lft forever
    > ----------------------------------------------------------------------------------------------
    > xia@linux-5s1r:~/Desktop> ip route
    > 127.0.0.0/8 dev lo scope link
    > ----------------------------------------------------------------------------------------------
    > xia@linux-5s1r:~/Desktop> ip -s link
    > 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    > link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    > RX: bytes packets errors dropped overrun mcast
    > 40753 500 0 0 0 0
    > TX: bytess
    > ----------------------------------------------------------------------------------------------
    > I then tried to re-install Opensuse 11.3 (32bit) and Opensuse 11.1
    > (64bit) which is the one my colleague incorrectly installed on our 32
    > bit machine). The same thing with those two versions.
    >
    > Any clue what is wrong here? Thanks for your help! I am new to Linux,
    > so I may made stupid mistakes here.
    >
    > Xia
    >
    >

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  3. #3

    Default Re: no internet connection Opensuse 11.3

    I believe it is not receiving one from a DHCP server, since other machines on my network get assigned addresses via DHCP? As for the /var/log/messages, I need to go to my lab tomorrow to have that information.

    Is that possible that the network administrator blocked my network access, since I re-installed the system and it was not recognized by their "security system"? However, I also re-installed other machines in the same network several months ago and they worked just fine.

    Thanks a lot for your reply.

    Xia

  4. #4

    Default Re: no internet connection Opensuse 11.3

    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    Sure... there could be any number of administrator-side network settings.
    Perhaps the DHCP server doesn't recognize your MAC address and therefore
    fails (a LiveCD/LiveDVD on a working system would prove this pretty easily
    in most cases). Perhaps you have 801.1x (as I recall) authentication, in
    which case there is some kind of authentication for the user in order to
    get on the network fully, though I think in that case there is still some
    IP address assigned to get that all going (I am not an expert in that area
    so ask your admin).

    Good luck.





    On 04/05/2011 08:36 PM, xiazhang3 wrote:
    >
    > I believe it is not receiving one from a DHCP server, since other
    > machines on my network get assigned addresses via DHCP? As for the
    > /var/log/messages, I need to go to my lab tomorrow to have that
    > information.
    >
    > Is that possible that the network administrator blocked my network
    > access, since I re-installed the system and it was not recognized by
    > their "security system"? However, I also re-installed other machines in
    > the same network several months ago and they worked just fine.
    >
    > Thanks a lot for your reply.
    >
    > Xia
    >
    >

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  5. #5

    Default Re: no internet connection Opensuse 11.3

    When you say you have disabled ipv6 just what have you changed? I suspect you haven't really.

    Going on my experiences with another problem, see my posts, IPV6 is available from the kernel what ever is done and it's use is down to the application. Eg I disabled it in the usual ways at the kernel level by adding to the boot appends. No joy. I disabled it locally in firefox and firefox started working. I found yet another disable mechanism and the Konqueror browser started working. That one looks to be intended for global use but YAST is still communicating with IPV6 and as a result DNS isn't working reliably. I have left an update running for about 11hrs and it's only 11% done as a results. The browsers can access the repositories with ease and even download the files.

    I wont swear to it but the use of the "seemingly global" disable seems to have slowed the browsers down some what. Response times were excellent.

    The usual way of disabling ipv6 in kde by the way doesn't do anything.

    I have found one remaining way of disabling it - recompiling the kernel but I don't think that would be a very good idea.

    On your mac's it's unusual for these to be logged into servers. What would visitors etc do? Also changing the OS doesn't change the mac. The protocols must be the same though.

    John

  6. #6

    Default Re: no internet connection Opensuse 11.3

    Thanks for John's comments on IPV6. I disabled it during the installation process. I did notice you cannot disable it in YAST.

    Another thing I am thinking is the network card driver. When I typed 'dmesg | grep eth0', I got something like "martian source 255.255.255.255 from 134.xx.xxx.xxx (similar to the other machines' IP addresses). When I typed the same thing on other machines, I got some information like " OUT=MAC=XXXX, SPC=xxx, DST=XXX, LEN=XXX ...". So, how can I know whether the network card driver is working correctly?

    As for the var/log/messages, it contains too many lines. So I cannot post all of them here. The last several are the following:

    Apr 6 11:42:21 linux-fw9k kernel: ll header: ff:ff:ff:ff:ff:ff:58:b0:35:fc:91:25:08:00
    Apr 6 11:42:34 linux-fw9k dhcpcd[2893]: eth0: timed out
    Apr 6 11:42:34 linux-fw9k dhcpcd[2893]: eth0: trying to use old lease in `/var/lib/dhcpcd/dhcpcd-eth0.info'
    Apr 6 11:42:34 linux-fw9k dhcpcd[2893]: eth0: broadcasting for a lease

    Is there anything special in the message file I need to look for?

    Thanks again for your help!

  7. #7

    Default Re: no internet connection Opensuse 11.3

    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    Disabling IPv6 is possible from Yast under the Network Services section
    where you configure the NIC. Even though you are probably using Network
    Manager you can still use one section of the Yast screen for Network
    Devices to enable/disable IPv6. You must reboot to disable IPv6.

    The messages stuff looks like it is asking for an IP address using device
    eth0 but if that's the end then nothing is responding. Are other systems
    on the network configured to use DHCP or are they, perhaps,
    statically-assigned IP addresses?

    Good luck.





    On 04/06/2011 11:36 AM, xiazhang3 wrote:
    >
    > Thanks for John's comments on IPV6. I disabled it during the
    > installation process. I did notice you cannot disable it in YAST.
    >
    > Another thing I am thinking is the network card driver. When I typed
    > 'dmesg | grep eth0', I got something like "martian source
    > 255.255.255.255 from 134.xx.xxx.xxx (similar to the other machines' IP
    > addresses). When I typed the same thing on other machines, I got some
    > information like " OUT=MAC=XXXX, SPC=xxx, DST=XXX, LEN=XXX ...". So, how
    > can I know whether the network card driver is working correctly?
    >
    > As for the var/log/messages, it contains too many lines. So I cannot
    > post all of them here. The last several are the following:
    >
    > Apr 6 11:42:21 linux-fw9k kernel: ll header:
    > ff:ff:ff:ff:ff:ff:58:b0:35:fc:91:25:08:00
    > Apr 6 11:42:34 linux-fw9k dhcpcd[2893]: eth0: timed out
    > Apr 6 11:42:34 linux-fw9k dhcpcd[2893]: eth0: trying to use old lease
    > in `/var/lib/dhcpcd/dhcpcd-eth0.info'
    > Apr 6 11:42:34 linux-fw9k dhcpcd[2893]: eth0: broadcasting for a lease
    >
    > Is there anything special in the message file I need to look for?
    >
    > Thanks again for your help!
    >
    >

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  8. #8

    Default Re: no internet connection Opensuse 11.3

    The other systems were configured using DHCP not static IP.

  9. #9

    Default Re: no internet connection Opensuse 11.3

    Disabling IPV6 that way doesn't stop yast or konqueror from using it. They still use IPV6 and from time to time the dns request does get through. This suggests that the facility is always there in the kernel come what may.

    Editing /etc/sysctrl.conf at the obvious place does cause konqueror to start using ipv4 but but yast carries on as usual and as it does get going infrequently the facility must still be available.

    There is a kernel compile option relating to ipv6 but who knows what other effects this may have. It may well result in causing problems in other areas.

    By the way I did try that one as well - no effect. What seems to have happened is that the ipv6 disabling is no longer a problem for the kernel to handle.

    John

  10. #10

    Default Re: no internet connection Opensuse 11.3

    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    Something's keeping your DHCP server from giving out IP addresses then.
    Ask your admin what could prevent that.

    Good luck.





    On 04/06/2011 01:36 PM, xiazhang3 wrote:
    >
    > The other systems were configured using DHCP not static IP.
    >
    >

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