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WRT54GL questions

Discussion in 'General Discussion' started by GertE, Aug 6, 2006.

  1. GertE

    GertE LI Guru Member


    After having to upgrade the good old wired Linksys 5 port hub because of it getting damaged by a nearby lightning strike we decided to go wireless and bought a WRT54GL and some wireless NICs.

    I noticed that our download speeds with the WRT54GL are only half of what they used to be. Our slow ADSL connection in combination with the wired network got us 300 kB/s, with the wired router that's been reduced to 150 kB/s.

    It's not a problem with normal internet use, not even with streaming video; but the occasional big download could use a boost.

    Also, when playing games online there's a small "stutter" every few minutes. This never happened with the wired network. Pings to most servers are as good as 30 or 40 ms, but when the stutter occurs I have noticed pings as high as half a second!

    Is there a way to "fix" these small issues?

    Thanks in advance,

  2. Toxic

    Toxic Administrator Staff Member

    what MTU are you using for ADSL?
  3. GertE

    GertE LI Guru Member

    Hi Simon.

    Assuming that MTU is Maximum Transmission Unit (I had to look it up...) then the answer is: I don't know.

    Where can I find it?
  4. GertE

    GertE LI Guru Member

    Wow. You certainly put me on the right track, Simon!

    I did some more internet searchng on the MTU subject. 2 sites were particularly interesting.

    The first is the MTU Ping test at http://help.expedient.net/broadband/mtu_ping_test.shtml . After a number of tests I found that my optimal MTU setting is 1492.

    They mentioned a Dr. TCP program, which I found at http://www.dslreports.com/faq/tweaks/1. DRTCP . I entered the MTU in the Dr. TCP program, as can be seen in the screen shot (it was blank when I first started the program).

    The most surprising bit was that the TCP receive window was set to 5000 something. According to the Dr. TCP documentation that should have been 17520, for an XP system. So I changed that.

    Without even restarting I went to the nVidia website, to find a big demo, and now I'm back at 300 kB/s!

    So far so good. I have yet to restart my PC (I made a registry backup!) and try online gaming, but I'll report back later.

    Thanks Simon, couldn't have done it without your hint!

    Attached Files:

  5. GertE

    GertE LI Guru Member

    OK. I restarted. Two days ago :) But I've been busy.

    Everything's still working at full speed. The stuttering is still present, although it does seem to be a bit better, less frequent.

    Any suggestions for that?


  6. Toxic

    Toxic Administrator Staff Member

    Make sure you have set the MTU on the Router to 1492 as well. the setting should be in the main webpage of the setup pages.
  7. GertE

    GertE LI Guru Member

    Thanks Simon. For some reason I didn't get notified of your reply, which is why I'm a little late.

    I'll try that, after I reset the unit. Yep, I've forgotten my password...
  8. jgutz20

    jgutz20 Network Guru Member

    how close are your wireless clients to the router? what kind of signal strength are you getting
  9. GertE

    GertE LI Guru Member

    One client is less than two feet away, the second around 6 feet, and the third usually around 15 feet. All of them have perfect reception, and I can only detect one other network in the neighborhood, not very strong (I think right next door).

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