Find the answer to your Linux question:
Results 1 to 5 of 5
Hi Guys, Before I describe my problem, you should understand my network layout. Code: INTERNET | | DSL Box | | SuSE Desktop (192.168.10.1) (Running Apache, SSH, & a Tor ...
Enjoy an ad free experience by logging in. Not a member yet? Register.
  1. #1
    Linux Guru smolloy's Avatar
    Join Date
    Apr 2005
    Location
    CA, but from N.Ireland
    Posts
    2,414

    Slow network


    Hi Guys,
    Before I describe my problem, you should understand my network layout.
    Code:
      INTERNET                
         |                  
         |                 
      DSL Box
         |
         |
    SuSE Desktop (192.168.10.1) (Running Apache, SSH, & a Tor server)
    (Dual LAN)
         |
         |
    Router (Wired/Wireless)
         |
         |
      Laptop (192.168.0.2)
    So basically, browsing the web with the laptop is using the same DSL line as the SuSE desktop. The problem is that internet access on the laptop intermittently slows to a crawl, and sometimes becomes so frustrating to use that I am likely to throw it out the window! I should note that this problem has only arisen in the last 24 hours, but I am not aware of any changes I have made that could have caused this.

    It's not related to the laptop network hardware since it occurs both with the wired and wireless connection. It's not the DSL line since the SuSE desktop is as fast as usual. It's not the laptop software as it doesn't matter if Ubuntu or XP is running on it.

    Using the SuSE box I had a look at the network traffic between the desktop and the laptop with iftop. When someone clicks on a link on the laptop, I can see traffic start between the laptop and whatever website, but then it repeatedly stops and starts, with only a small amount of data passing each time.

    To be honest I'm completely out of ideas on this one. I don't even know what I should do to to investigate this, never mind solve it! It would be great if any of you guys could give me any pointers/hints/tips.

    Cheers.
    Registered Linux user #388328 || Registered LFS user #15880
    AMD 64 X2 4600+ :: 2X1GB DDR2 800 :: GeForce 9400 GT 512MB :: ASUS M2N32 Deluxe :: 4X250GB SATAII
    Need instant help? Try us on IRC -- #linuxforums on freenode

  2. #2
    Linux User
    Join Date
    Aug 2006
    Location
    Croydon, PA
    Posts
    392
    You may want to check the configuration of the ethernet cards on both boxes.
    The command is :

    ethtool <NIC>


    or


    ethtool eth0


    The things you want to look at are:
    advertised Auto-negotiation NO
    Duplex FULL
    Speed 100Mb/s

    If they are not set to this then set them:

    ethtool -s eth0 autoneg no duplex full speed 100


    Now you nic# may be different.
    Good Luck,
    Ski
    RHCT

  3. #3
    Linux Guru smolloy's Avatar
    Join Date
    Apr 2005
    Location
    CA, but from N.Ireland
    Posts
    2,414
    Thanks Skiboy. I really appreciate your help.

    On the laptop I get the (unhelpful) response,
    Settings for eth2:
    No data available
    For the desktop I get a full response, and I see that advertised auto-negotiation is set to "yes" (everything else is as you advised). Before I change auto-negotiation to "no", perhaps you could explain what it means?
    Registered Linux user #388328 || Registered LFS user #15880
    AMD 64 X2 4600+ :: 2X1GB DDR2 800 :: GeForce 9400 GT 512MB :: ASUS M2N32 Deluxe :: 4X250GB SATAII
    Need instant help? Try us on IRC -- #linuxforums on freenode

  4. #4
    Linux Guru smolloy's Avatar
    Join Date
    Apr 2005
    Location
    CA, but from N.Ireland
    Posts
    2,414
    So I tried "ethtool -s eth1 autoneg off"and now the network doesn't work at all. Unfortunately trying to get things working again by switching autonegotiation back on doesn't work. Also, the speed is now 10Mb/s, and it only allows half duplex. And, as I said, autonegotiation is stuck on "yes".

    Anyone any ideas. Even a slow network is better than no network.

    EDIT: I can reach the router from the laptop, but not from the desktop. And, obviously, there is no communication between the two computers. Why did switching off autonegotiation break the networking, and why isn't it a simple matter of switching it back on again?
    Registered Linux user #388328 || Registered LFS user #15880
    AMD 64 X2 4600+ :: 2X1GB DDR2 800 :: GeForce 9400 GT 512MB :: ASUS M2N32 Deluxe :: 4X250GB SATAII
    Need instant help? Try us on IRC -- #linuxforums on freenode

  5. #5
    Linux Guru smolloy's Avatar
    Join Date
    Apr 2005
    Location
    CA, but from N.Ireland
    Posts
    2,414
    Anyone any ideas? This is killing me. Or should I say my wife will kill me if she can't get online with her windows laptop to video-skype back home to her sister.

    Registered Linux user #388328 || Registered LFS user #15880
    AMD 64 X2 4600+ :: 2X1GB DDR2 800 :: GeForce 9400 GT 512MB :: ASUS M2N32 Deluxe :: 4X250GB SATAII
    Need instant help? Try us on IRC -- #linuxforums on freenode

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •