Very slow lan

Discussion in 'Tomato Firmware' started by Partizan, Aug 29, 2009.

  1. Partizan

    Partizan Network Guru Member


    I have two computers in lan, both wired with fixed IPs, and transfering files between them is really slow, like 5500-6000 kbytes/s. One computer is running Windows 7, the othe Windows XP. Any ideas how to improve speed?

    Router is a WRT54GL with latest tomato.
  2. mstombs

    mstombs Network Guru Member

    If your units are kBytes then 50Mbits per second is pretty good for a 100Mb/s lan - is everything set to 100/Full duplex?
  3. bogderpirat

    bogderpirat Network Guru Member

    nothing below 10MB/s is pretty good with 100MBit/s.
  4. Partizan

    Partizan Network Guru Member

    Everything is set to Full duplex.
  5. RonWessels

    RonWessels Network Guru Member

    On the LAN side, the router acts as a pure hardware switch. In other words, there is no interaction or control by the router software for packets going from one LAN port to another. So the problem is either a hardware fault on the router or is on one or both of your computers.

    To track it down, try getting a separate Ethernet switch and plugging your computers into that. Then plug one of the switch ports into one of the router LAN ports to complete that connection. Now, communications between the two computers won't even be seen by the router hardware, since the switch will route the packets directly.

    Assuming that still results in a slow connection, one thought that I had would be to make sure that the time is set on both computers to within a second or so. I have found that when Windows uses file sharing between computers with significantly disparate time settings, the throughput drops dramatically. I suspect each transfer somehow re-establishes the security permissions first, causing a huge overhead in the simple transfer. Now, I made this discovery on computers with a common domain controller, and I don't know if the same effect will happen with a workgroup connection.
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