network slows down
Page 1 of 2 12 LastLast
Results 1 to 10 of 19

Thread: network slows down

  1. #1
    Member
    Join Date
    May 2005
    Posts
    93

    network slows down

    my network does slow down after every 5 minutes (more or less) of net activity. after several minutes, it goes back normally. the OS before was windows 2000 advanced server and i've tried installing the windows XP as a server in another computer (server capable). for about 5 (i think) hours after i've installed the XP. the network was working pretty good including the net activity of workstations. there is no problem in LAN actually. it seems like just our internet connection goes slow. so i've uninstalled the XP (formatted, unpartitioned) and installed linux (gutsy gibbon). now, my server is fine and working good for several days. just before the year ends. the problem occured once again.

    does anyone had the same problem with their network or maybe i was infiltrated with virus or spam or whatever?

    i badly need some help. thank you.
    .sig na ture.

  2. #2
    Just Another Geek
    Join Date
    Jul 2002
    Location
    Rotterdam, Netherlands
    Posts
    3,403
    Run a sniffer and have a look...
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  3. #3
    How well versed are you in network troubleshooting? I'd start by waiting until it slows down again. When it does, simply run a tracert to google.com or something, and see if you can spot where packets are dropping or slowing down. That will help you first determine if the problem is internal or with your ISP. This could be anything from a bad router to an infected computer on the network hogging bandwidth to who knows what. We need more info.

  4. #4
    Super Moderator: GMT Zone nihil's Avatar
    Join Date
    Jul 2003
    Location
    United Kingdom: Bridlington
    Posts
    17,190
    Is this problem still happening? I could understand poor performance around Christmas and the New Year because traffic is much heavier.
    If you cannot do someone any good: don't do them any harm....
    As long as you did this to one of these, the least of my little ones............you did it unto Me.
    What profiteth a man if he gains the entire World at the expense of his immortal soul?

  5. #5
    Member
    Join Date
    May 2005
    Posts
    93
    just got to the office. sorry for the late reply.

    SirDice: what's the use of sniffer? am currently running windows 2k adv. server (the old server).

    AngelicKnight: i just did a tracert to google ad here's the result:

    Tracing route to google.com [64.233.187.99]
    over a maximum of 30 hops:


    1 2 ms 1 ms 1 ms 192.168.1.1
    2 * * * Request timed out.
    3 * * * Request timed out.
    4 * * * Request timed out.
    5 * * * Request timed out.
    6 * * * Request timed out.
    7 * * * Request timed out.
    8 * * * Request timed out.
    9 * * * Request timed out.
    10 * * * Request timed out.
    11 * * * Request timed out.
    12 * * * Request timed out.
    13 * * * Request timed out.
    14 * * * Request timed out.
    15 * * * Request timed out.
    16 312 ms 311 ms 311 ms jc-in-f99.google.com [64.233.187.99]

    Trace complete.

    that 192.168.1.1 is the ip address of my server's modem which connect to the internet.
    .sig na ture.

  6. #6
    Member
    Join Date
    May 2005
    Posts
    93
    Quote Originally Posted by nihil
    Is this problem still happening? I could understand poor performance around Christmas and the New Year because traffic is much heavier.
    even before christmas and after new year the problem occurs. we already changed ISP bcoz we thought that the problem was with the ISP.
    .sig na ture.

  7. #7
    Super Moderator: GMT Zone nihil's Avatar
    Join Date
    Jul 2003
    Location
    United Kingdom: Bridlington
    Posts
    17,190
    OK, it was just a thought. I would still be inclined to have your connection checked.

    I assume that although you changed your ISP, your connection remains the same? OK I don't know your architecture so I am guessing it is something like I see around here. You connect to your telco along their copper wire, and then to your ISP.
    If you cannot do someone any good: don't do them any harm....
    As long as you did this to one of these, the least of my little ones............you did it unto Me.
    What profiteth a man if he gains the entire World at the expense of his immortal soul?

  8. #8
    Member
    Join Date
    May 2005
    Posts
    93
    yes, same architecture on LAN. my server does have two NIC, one for the LAN and the other to modem/router which the latter NIC is shared for LAN.
    .sig na ture.

  9. #9
    Super Moderator: GMT Zone nihil's Avatar
    Join Date
    Jul 2003
    Location
    United Kingdom: Bridlington
    Posts
    17,190
    Hi,

    What is your connectivity: wired, wireless or a mixture?

    I would suggest the following:

    1. Get your telephone company to check the line.
    2. Try different cables to connect to the router/modem.
    3. Try swapping the two NICs over.
    4. Can you try a different modem/router?

    At the moment I am not suspecting malware, given the different operating systems that you have tried. If it is malware then it is something pretty exotic to survive those changes.

    At this point i would also start checking my logs and management software and see exactly what my users are getting up to. It only takes one idiot hogging the bandwidth? Obviously, if you have a rogue user, it doesn't matter what operating system you are using, as it is their activities that are causing the problem.
    If you cannot do someone any good: don't do them any harm....
    As long as you did this to one of these, the least of my little ones............you did it unto Me.
    What profiteth a man if he gains the entire World at the expense of his immortal soul?

  10. #10
    Just Another Geek
    Join Date
    Jul 2002
    Location
    Rotterdam, Netherlands
    Posts
    3,403
    Quote Originally Posted by yatot
    jSirDice: what's the use of sniffer?
    A sniffer is a simpler word for Network Protocol Analyzer. It shows you the IP packets that are on the "line". You would need to have some TCP/IP knowledge.

    http://www.wireshark.org
    Oliver's Law:
    Experience is something you don't get until just after you need it.

Similar Threads

  1. Trojans - Ports
    By GbinaryR in forum AntiVirus Discussions
    Replies: 11
    Last Post: October 30th, 2008, 09:33 AM
  2. Introduction to Securing a Wireless Network.
    By keezel in forum The Security Tutorials Forum
    Replies: 28
    Last Post: December 11th, 2006, 10:02 PM
  3. Hijackthislog What files to delete?
    By dantesheaven in forum Spyware / Adware
    Replies: 9
    Last Post: October 24th, 2004, 01:49 PM
  4. Tcp/ip
    By gore in forum Newbie Security Questions
    Replies: 11
    Last Post: December 29th, 2003, 07:01 AM

Posting Permissions

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

 Security News

     Patches

       Security Trends

         How-To

           Buying Guides