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Thread: Wired Network Weirdness

  1. #1
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    May 2008
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    Ubuntu 8.04 Hardy Heron

    Wired Network Weirdness

    Hi everyone,

    After spending hours trying to figure out my network issue in google and browsing MANY forums, I thought maybe I should come here and ask you guys.

    First I have a Broadcom Netxtreme 5751 Wired Card in a Dell Optiplex GX620 and FRESH install of Ubuntu 8.04.

    The weirdness is that I get an IP, and I can ping IPs in my subnet (10.11.4.x) however when I try go to the web or anyplace other than 10.11.4.x I can't get out. And I have already disabled IPv6 via the blacklist AND in the aliases parts in modprobe.d

    Any help would be GREAT,
    Ryan

    PS
    I'm not a complete linux n00b but I am definately an Ubuntu newbie.

  2. #2
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    Re: Wired Network Weirdness

    Hi

    The output to these would be helpful:

    Code:
    sudu lshw -C network
    Code:
    ifconfig
    Code:
    sudo dhclient
    Code:
    cat /etc/resolv.conf
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  3. #3
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    Re: Wired Network Weirdness

    I didn't want you to think I wasn't checking this thread, but this is on a work machine and I won't be back to work until Wednesday (may 28th) and I will post those results ASAP.

    Thanx for the reply

  4. #4
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    Re: Wired Network Weirdness

    Here is the output from the commands you asked about. Thanx again for at least looking at this. PS I did a brand new install again so IPv6 stuff is on at the time of this post and for the commands below. If you want me to turn them off again just let me kow.

    Code:
    sudu lshw -C network
    *-network
           description: Ethernet interface
           product: NetXtreme BCM5751 Gigabit Ethernet PCI Express
           vendor: Broadcom Corporation
           physical id: 0
           bus info: pci@0000:01:00.0
           logical name: eth0
           version: 01
           serial: 00:18:8b:5c:28:60
           size: 100MB/s
           capacity: 1GB/s
           width: 64 bits
           clock: 33MHz
           capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
           configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.86 duplex=full firmware=5751-v3.44a ip=10.11.4.40 latency=0 link=yes module=tg3 multicast=yes port=twisted pair speed=100MB/s
    Code:
    ifconfig
    eth0      Link encap:Ethernet  HWaddr 00:18:8b:5c:28:60  
              inet addr:10.11.4.40  Bcast:10.11.7.255  Mask:255.255.252.0
              inet6 addr: fe80::218:8bff:fe5c:2860/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:2466 errors:0 dropped:0 overruns:0 frame:0
              TX packets:42 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:1067145 (1.0 MB)  TX bytes:6570 (6.4 KB)
              Interrupt:16 
    
    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:986 errors:0 dropped:0 overruns:0 frame:0
              TX packets:986 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:49300 (48.1 KB)  TX bytes:49300 (48.1 KB)
    Code:
    sudo dhclient
    Internet Systems Consortium DHCP Client V3.0.6
    Copyright 2004-2007 Internet Systems Consortium.
    All rights reserved.
    For info, please visit http://www.isc.org/sw/dhcp/
    
    Listening on LPF/eth0/00:18:8b:5c:28:60
    Sending on   LPF/eth0/00:18:8b:5c:28:60
    Sending on   Socket/fallback
    DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4
    DHCPOFFER of 10.11.4.40 from 10.11.0.2
    DHCPREQUEST of 10.11.4.40 on eth0 to 255.255.255.255 port 67
    DHCPACK of 10.11.4.40 from 10.11.0.2
    SIOCADDRT: No such process
    bound to 10.11.4.40 -- renewal in 39561 seconds.
    Code:
    cat /etc/resolv.conf
    search fulton.cnyric.org
    nameserver 10.11.0.2
    nameserver 10.10.0.3
    nameserver 10.10.0.27
    Last edited by mcdougrs; May 28th, 2008 at 03:15 PM. Reason: forgot to mention an important detail.

  5. #5
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    Re: Wired Network Weirdness

    I can't see anything wrong with those outputs.
    but this is on a work machine
    Are you positive that the network administrator (I'm making a big assumption it isn't you. Forgive me if I'm wrong) has the network configured for internet access?

    Can you ping your DHCP router service?

    Code:
    ping -c4 10.11.0.2
    Can you ping Google?

    Code:
    ping -c4 www.google.com
    Last edited by mapes12; May 28th, 2008 at 03:48 PM.
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  6. #6
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    Re: Wired Network Weirdness

    I've just realised something:

    Mask:255.255.252.0
    Your IP address is a class A private address. The subnetmask to which should be 255.0.0.0

    Class B would be mask 255.255.0.0

    Class C would be mask 255.255.255.0

    So, your subnetmask is none standard. It might not be the problem but it's the only irregularity I can see.

    EDIT:..............on the other hand, based on the analogy of your subnetmask being like an area code on a telephone exchange, it could be that packet header handlers somewhere are seeing a class A prefix and assuming a standard subnetmask of 255.0.0.0 If this were the case you may be able to "see" the internet but the internet would be returning your traffic to an incorrect address?? Just a thought.
    Last edited by mapes12; May 28th, 2008 at 04:03 PM.
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  7. #7
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    Re: Wired Network Weirdness

    Hello,

    You were correct in your assumption that I am not the network administrator. The network is configured for internet access though. The same machine with windows XP on it can get out to the internet ok with those settings configured the same via dhcp. As far as the subnet mask goes, the only answer I can offer for that is... We split the class A in to serveral seperate subnets so that we can use different subnets for different purposes (i.e. servers on one subet, printers on another, dhcp clients on anther one etc etc). That of which I did not set up.

    Yeah with the first ping command gives me "connect: Network is unreachable" and the second gives me a "ping: unknown host www.google.com" Which seems logical seeing as how it can't get out to the DNS server. But why is that WindowsXP can handle the DHCP settings fine but linux can't (retorical question, I don't know if there is an answer for that). Should I try and set my IP config up manually and give it a different subnet mask? If so would I use the 255.0.0.0 that you mention above?

    The one REALLY confusing part is that if I use a live CD distro of SLAX (not sure which version right now) I can access the internet and the rest of the network just fine.

    Thanx again for your help.
    Last edited by mcdougrs; May 28th, 2008 at 04:02 PM.

  8. #8
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    Re: Wired Network Weirdness

    "connect: Network is unreachable"
    So are we saying the ping to the router failed?
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  9. #9
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    Re: Wired Network Weirdness

    Well... I cannot ping the DNS server. I can however ping any other active PC in my subnet. I can get to 0.2 because that is also the DHCP server. So needless to say I'm quite confused.

  10. #10
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    Re: Wired Network Weirdness

    I cannot ping the DNS server
    I appreciate your comments about the network being configured for internet access but as you know, no DNS service = no internet service.
    I can however ping any other active PC in my subnet
    This is expected since these machines are on the same "dialing code/local telephone exchange". Please excuse my analogy but it's the only way I get this stuff straight.

    I am still of the opinion that the network subnetmask none standard configuration is screwing something up. Per previous posts, your client machine does not exhibit any configuration issues.

    Are there any other Linux machines in your LAN that work in this network configuration?
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