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Thread: network comes and goes -- but problem is with my computer, not my ISP!

  1. #1
    Join Date
    Feb 2009
    Beans
    20
    Distro
    Ubuntu 10.04 Lucid Lynx

    network comes and goes -- but problem is with my computer, not my ISP!

    I have two laptops on my desk: one running Jaunty Jackalope, the other running Lucid Lynx. I have one Ethernet cable running straight to the wall. When I plug in Jackalope, I get a connection. When I plug in Lynx, I sometimes get a connection, sometimes not. Meanwhile I change no settings.

    Behavior on Lynx is very strange. My ISP provides IP addresses of the form 69.90.X.X. Recently however, through DHCP I sometimes wind up with an address of the form 192.168.0.X, suggesting I were on a LAN, which, as far as I know, I am not.

    Here is a sample:
    Code:
    $ sudo ifup eth2
    Internet Systems Consortium DHCP Client V3.1.3
    Copyright 2004-2009 Internet Systems Consortium.
    All rights reserved.
    For info, please visit https://www.isc.org/software/dhcp/
    
    Listening on LPF/eth2/00:0b:97:dc:59:2e
    Sending on   LPF/eth2/00:0b:97:dc:59:2e
    Sending on   Socket/fallback
    DHCPDISCOVER on eth2 to 255.255.255.255 port 67 interval 7
    DHCPOFFER of 69.90.53.177 from 69.90.52.1
    DHCPREQUEST of 69.90.53.177 on eth2 to 255.255.255.255 port 67
    DHCPNAK from 192.168.0.1
    DHCPDISCOVER on eth2 to 255.255.255.255 port 67 interval 5
    DHCPOFFER of 192.168.0.191 from 192.168.0.1
    DHCPREQUEST of 192.168.0.191 on eth2 to 255.255.255.255 port 67
    DHCPNAK from 69.90.52.1
    DHCPACK of 192.168.0.191 from 192.168.0.1
    bound to 192.168.0.191 -- renewal in 4097 seconds.
     * Stopping the Firestarter firewall...
       ...done.
     * Starting the Firestarter firewall...
       ...fail!
    run-parts: /etc/network/if-up.d/50firestarter exited with return code 2
    ssh stop/waiting
    ssh start/running, process 6732
    Sure enough, I've got the address 192.168.0.191:
    Code:
    $ ifconfig
    eth2      Link encap:Ethernet  HWaddr 00:0b:97:dc:59:2e  
              inet addr:192.168.0.191  Bcast:192.168.0.255  Mask:255.255.255.0
              inet6 addr: fe80::20b:97ff:fedc:592e/64 Scope:Link
              UP BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:902738 errors:0 dropped:0 overruns:0 frame:0
              TX packets:2228 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:76115742 (76.1 MB)  TX bytes:190957 (190.9 KB)
              Interrupt:19 Base address:0x2000
    and no connection:
    Code:
    $ ping google.com
    ping: unknown host google.com
    Today, on the other hand, I started up Lynx, and got a nice connection with an address starting with 69.90.

    But this is not even the whole problem! Sometimes I get an address starting with 69.90 and still cannot open any web pages, ping anything, ssh anything, etc. etc. Nothing works.

    It seems to be completely random.

    I have changed no settings.

    The only thing I can think of that has changed is that I have installed updates from Update Manager once or twice since this problem began. Still, why should that result in this kind of random, hit-or-miss behavior?

    Here is my /etc/network/interfaces file:
    Code:
    $ cat /etc/network/interfaces
    auto lo
    iface lo inet loopback
    
    auto eth1
    iface eth1 inet dhcp
    wpa-ssid ########
    wpa-psk ########
    
    auto ath0
    
    auto wlan0
    
    auto eth2
    iface eth2 inet dhcp
    Can anyone figure this out? Thank you for any ideas!

  2. #2
    Join Date
    Dec 2007
    Location
    The last place I look
    Beans
    Hidden!
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: network comes and goes -- but problem is with my computer, not my ISP!

    well all else aside, cablemodems don't like to have their cabling changed without a reboot, so if you are changing the host connected to the cable modem directly, then you will likely have to reboot the CM every time.

    I'd get a switch if not a router.
    Things are rarely just crazy enough to work, but they're frequently just crazy enough to fail hilariously.

  3. #3
    Join Date
    Feb 2009
    Beans
    20
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: network comes and goes -- but problem is with my computer, not my ISP!

    I had been considering getting a switch, and, on your advice, went ahead with it. That was nearly a week ago, and so far the problems have been eliminated. Looks like a solution. Thanks for the advice!

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