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Thread: Ping works, WWW doesn't

  1. #1
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    Ping works, WWW doesn't

    Hi folks,
    i bought a Asus-Netbook Eee Pc 1005HA PU17 recently and am pretty happy with it. As I installed Ubuntu 9.10 on it today I was unable to get the Internet connection to work. I am able to connect to a network (wired as well as wireless) but cannot open Websites (the connection times out) or update my ubuntu install. What's really strange is that pinging IPs and websites works just fine.

    I tried different Kernels (2.6.31-16 and 2.6.32) as well as installing backports.

    My network chips are Atheros AR8132 for Ethernet and Atheros AR9285 for WLAN.

    Furthermore the Internet works perfectly in Windows 7 and even in Moblin 2.1.

    Would be great if anyone would have an advice. Thanks!

  2. #2
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    Re: Ping works, WWW doesn't

    My latest favorite villain is MTU - this thread shows a troubleshooting technique.
    Linux User #415691 Ubuntu User #8629
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  3. #3
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    Re: Ping works, WWW doesn't

    I suspect something is blocking outbound connections to port 80 from your machine.

    Do you have something like this in either ~/.profile or /etc/profile?

    Code:
    export  http_proxy=http://proxy-server.mycorp.com:3128/
    To check ~/.profile , please use :

    Code:
    gedit ~/.profile
    For /etc/profile use :

    Code:
    sudo gedit /etc/profile
    It could also be a firewalling rule. A look at what you've got set may be very illuminating. You can list them using :

    Code:
    sudo iptables -L
    Additionally, you're connecting via DHCP, yes? This post ( http://ubuntuforums.org/showthread.php?t=911963 ) suggests if you set up a static address, an error in the gateway setting can cause this.
    I just need your bank account number and sort code, and we can wire you the monies directly.

  4. #4
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    Re: Ping works, WWW doesn't

    Thanks for your hints, but the problem still persists.

    @Iowan: I tried pinging -s 32 and -s 1600 and both of them succeeded. So I don't think it's an MTU issue.

    @changingstate: I didn't add anything to my profile files since it's a fresh install. There is no export statement in them. Also the iptables seem to be empty. Yes, I am connecting via DHCP.

    This is the output of wget www.google.com (it is stuck after that):
    Code:
    wget www.google.com > result
    --2010-01-12 00:37:58--  http://www.google.com/
    Resolving www.google.com... 74.125.39.147
    Connecting to www.google.com|74.125.39.147|:80... connected.
    HTTP request sent, awaiting response... 302 Found
    Location: http://www.google.it/ [following]
    --2010-01-12 00:37:58--  http://www.google.it/
    Resolving www.google.it... 1.0.0.0
    Connecting to www.google.it|1.0.0.0|:80...
    Seems to be a DNS problem imho. I double checked the systems proxy config and it's set to "Direct Connection to the Internet".

  5. #5
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    Re: Ping works, WWW doesn't

    Aaah, I've seen this with a flaky DNS server on an old D-Link router I have floating around somewhere. It utterly loathed the DNS requests from my debian 2.2 system but was quite happy with the windows systems.

    IIRC, I hacked /etc/resolv.conf to access my ISP's nameserver directly, rather than the D-Link router. It produced a little more traffic on the network, but it fixed the issue.
    Last edited by changingstate; January 12th, 2010 at 03:17 AM. Reason: Yes, there was a typo. Thank you.
    I just need your bank account number and sort code, and we can wire you the monies directly.

  6. #6
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    Ubuntu 12.04 Precise Pangolin

    Re: Ping works, WWW doesn't

    Adding my three ha'p'n'th it does sound a little like DNS issues or firewall.
    I hate this answer but have you rebooted your router since setting up the system. There are times when these bits of kit get their underwear twisted and rebooting can often provide a resolution.
    Mick 'n Keef rock, Chas beats time and Ronnie is the new boy
    Registered as user 466848 with the Linux Counter. Registered Ubuntu User 22858. Our company website or our new venture

  7. #7
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    Re: Ping works, WWW doesn't

    I was afraid I'd used up my luck on MTU...
    What's in /etc/resolv.conf? (Although you'd think DNS would mess with pings, too)
    Linux User #415691 Ubuntu User #8629
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  8. #8
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    Re: Ping works, WWW doesn't

    Thanks changingstate! Your solution seems to have fixed my problem. I just modified the setting in the network-manager not in resolv.conf as I just want this to happen for this specific connection/router (and yes it's one from D-Link ).
    What's strange though is that pinging works, i.e. the ping program gets the correct DNS response while others arent. Additionally my other notebook works with 9.04 withouth a glitch. Why is that?

    Thanks to everyone who helped me solving this!

  9. #9
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    Re: Ping works, WWW doesn't

    co0lingFir3,

    I've never, ever managed to find a definitive answer. The posts I read at the time burbled about 'sending requests too fast', from what I remember. My guess is that D-Links DNS server implementation is poor and runs slowly, so unless the client software is willing to wait around ( probably something in the build configuration, I've not checked ), the requests time out and you end up end up with the fault as described. I've only ever seen it with D-Link hardware, not even rubbish like the thompson gear I'm using at the moment.
    I just need your bank account number and sort code, and we can wire you the monies directly.

  10. #10
    Join Date
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    Ubuntu 12.04 Precise Pangolin

    Re: Ping works, WWW doesn't

    Quote Originally Posted by changingstate View Post
    co0lingFir3,

    I've never, ever managed to find a definitive answer. The posts I read at the time burbled about 'sending requests too fast', from what I remember. My guess is that D-Links DNS server implementation is poor and runs slowly, so unless the client software is willing to wait around ( probably something in the build configuration, I've not checked ), the requests time out and you end up end up with the fault as described. I've only ever seen it with D-Link hardware, not even rubbish like the thompson gear I'm using at the moment.
    Agree with this I don't even know if there is a definitive answer. I have had as much trouble with more expensive routers as well as cheaper ones. Netgear in home use seem to do the job for the most part but I would not risk my neck on it.

    I suspect part of the problem is that even if the router is playing up we can't get into it to play and try to fix it. Shucks!!!!!!!
    Mick 'n Keef rock, Chas beats time and Ronnie is the new boy
    Registered as user 466848 with the Linux Counter. Registered Ubuntu User 22858. Our company website or our new venture

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