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-- Compex DS1216 10/100 16 Port Desktop Switch
-- Category: Review
-- Posted by: GideonX
-- Posted on: 2001-07-10
-- Price: ~ $175.00 USD
-- Pages: 1 [ 2 ] 3
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  The setup:

   There will be 8 computers:

  • 5 Pentium 133 or 166's that will be soon setup in a cluster

  • 1 P2 350

  • 1 Celeron 600 @ 900

  • 1 Tbird 1400 @ 1400

   All have 10/100 NICs in the them and are running at 100 base, full duplex.

   The 5 Pentiums will be running a linux IGMP DoS (Denial of Service) attacker, attacking each other to simulate a network load.  The linux 2.4.2 kernal seems to ignore these packets so it doesn't have the same effect as it does with windows (ie killing it).  These machines can send out around 3.5-4.1 megabytes/sec roughly the same as 5 computers doing TCP/IP file transfers (ie. Windows network transfer) without having to worry about performance hit of writing to a hard drive on an old Pentium machine. The settings for the IGMP attacker is as follows:

   65K packet sizes aimed at port 1

   The Celeron and the Tbird will do a majority of the benchmarks since they will be least affected due to low resources.  The Pentium2 350 will be monitoring the Pentiums DoS attack and recording the incoming and outgoing speeds, which will be reported using iptraf.  The reason why we aren't using the P2 350 as part of the benchmarking is that it returns a very high error rate and very slow network transfers.

   Each network transfer test will be done 3 times and we will take the average of the three transfers.

   The Tests: 

  1. Timed windows network transfer, with and without network traffic: Using a 696 Meg test file, we will time how long it takes to transfer the test file over the network. We will take the average of 3 transfers both with and without network traffic.       
  2. Timed windows FTP transfer with and without network traffic: Again, using a 696 Meg test file, we will time how long it takes to send the test file via FTP. The Ftp client that we used is LeapFTP, and the server that was used was Serv-U FTP (for those who think it matters). We will take the average of 3 transfers both with and without network traffic.        
  3. Timed Linux FTP transfer, with and without network traffic: Using our 696 Meg test file, we will time how long it takes to send the test file via FTP. The Ftp client that we used is NcFTP, and the server that was used was wuftpd. We will take the average of 3 transfers both with and without network traffic.        
  4. Sandra network throughput bench.        
  5. IGMP attack: We will use the IGMP attacker to test the full duplex of the switch, with the Celeron and the Tbird both DoSing each other. We will record the average amount of data (in megs/s) that was transferred in the attack.       
  6. MAC address buffer refresh times: It seems that at every LAN party there is a self-proclaimed know-it-all with a weak ass box, well at least there are at ours. And this know-it-all swears up and down that there is a "sweet port" on the switch and he is determined to find it. So he goes through and switches out his computer with another persons computer until he is satisfied that he has found the "sweet port." So what ends up happening on some switches? Everybody ends up not being able to see the network, why? Because the internal MAC address buffer in the switch hasn't refreshed, so its still trying to switch the packets to the computer that use to be there, but is now in a new port. So what you have to end up doing is unplugging the switch from the wall and re-plugging back in, or wait for the buffer to be refreshed and the know-it-alls blood spilled all over the floor.



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