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Thread: Network looks good, but can't ping anything

  1. #1
    Join Date
    May 2009
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    Angry Network looks good, but can't ping anything

    On a fairly fresh install of Jaunty, everything was going normally until I rebooted to add a HDD. Before the reboot, I installed a few basic packages, including uTorrent on Wine, G15stats/daemon and PeerGuardian. When the system came back up, I had zero internet connectivity. (I've since removed the HDD, but that hasn't made a difference.)

    Currently, these are my symptoms:

    • Cannot ping localhost, 127.0.0.1, or 192.168.0.118 (this machine), no other machines can ping this one (all pings are just lost)
    • ifconfig looks normal, two interfaces listed (eth0 and lo)
    • Unplugging and replugging the cable, Ubuntu recognizes the event and says it's connected
    • sudo dhclient3 seems to return an IP (this machine has a reserved IP on the router)
      • DHCPACK of 192.168.0.118 from 192.168.0.1
      • bound to 192.168.0.118 -- renewal in 905652007 seconds

    I'm at my wits end -- I've searched high and low for the cause of this, and while I'm still relatively new to Ubuntu, I can't fathom what could be causing this.

    Any help is greatly appreciated!


  2. #2
    Join Date
    Jan 2007
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    5,549

    Re: Network looks good, but can't ping anything

    post output of sudo iptables -L . have you installed firestarter or anything similar..try also sudo /etc/init.d/networking restart

  3. #3
    Join Date
    May 2008
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    Berks, UK
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    Re: Network looks good, but can't ping anything

    Whatever else caused the problem, it will not have been the HDD (unless through some disturbed cables/connections).
    A common problem is to load new software, the impact isn't present until it has had a chance to settle in and the system has been rebooted - I'd be looking at that new stuff as a possible cause.

    Apart from that, I'd go with the iptables suggestions, as firewalls are the most common way of rendering network connections useless.
    Derek

  4. #4
    Join Date
    May 2009
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    Re: Network looks good, but can't ping anything

    Quote Originally Posted by dandnsmith View Post
    Whatever else caused the problem, it will not have been the HDD (unless through some disturbed cables/connections).
    Yah, I was 99% sure the HDD wasn't related, but mentioned it just on the off-chance.

    Quote Originally Posted by superprash2003 View Post
    post output of sudo iptables -L .
    Code:
    Chain INPUT (policy ACCEPT)
    target   prot  opt  source     destination
    QUEUE   all    --    anywhere        anywhere
    
    Chain FORWARD (policy ACCEPT)
    target   prot  opt  source     destination
    
    Chain OUTPUT (policy ACCEPT)
    target   prot  opt  source     destination
    QUEUE   all    --    anywhere        anywhere
    Quote Originally Posted by superprash2003 View Post
    try also sudo /etc/init.d/networking restart
    An interesting result:
    Code:
     * Reconfiguring network interfaces...
    Ignoring unknown interface eth0=eth0
                                                                                  [ OK ]

  5. #5
    Join Date
    Jan 2007
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    5,549

    Re: Network looks good, but can't ping anything

    post output of the /etc/network/interfaces file

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