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Ack timing in tomato

Discussion in 'Tomato Firmware' started by kthaddock, May 28, 2011.

  1. kthaddock

    kthaddock Network Guru Member

    What is "Sensitivity Range (ACK Timing)" value settings in Tomato to wifi Broadcom ?
  2. ntest7

    ntest7 Network Guru Member

    This is one of those settings that should be left at the default unless you have a good reason to change it. Most of the "advanced" settings fall into that category.

    It's sometimes helpful to adjust the ACK timing for very long distance wireless links using specialized antennas.

    With very long links (typically several hundred meters or more), the receiver's response may not arrive within the normal time limit.

    Most people won't need to adjust this setting. Adjusting this setting unnecessarily may slow down your wireless performance.

    See google for further technical discussions about wifi ack timing.
  3. kthaddock

    kthaddock Network Guru Member

    Thanks for your answere, I realize my question not was clear.
    I'm aware of this function and have tested alot settings with this option.
    There is a different function in Atheros and Broadcom chipset.
    My question was: what valus is setted i Tomato ? 200, 2000 meters or what.

  4. pharma

    pharma Network Guru Member

    Broadcom chipset default 0
  5. kthaddock

    kthaddock Network Guru Member

    Yes 0 is 0 but in this case 0 is: "0 = use default" and what is default then ? :huh:
  6. rs232

    rs232 Network Guru Member

    In my understanding the ACK timing is a security feature. It basically discards radio packets that take longer than [n] (whatever you specify).
    0 means disable this feature thus accept all the packets no matter what timing.

    As far as I remember this value refers to meters and it's counted in round trip: e.g. in theory a client 100 meters away from the access point can communicate with the access point itself if this latter has an ACK timing of 200 or more.
    In reality you'll need an extra 10-15% to make this working (like 220-250)

  7. Toastman

    Toastman Super Moderator Staff Member Member

    The OP is asking WHAT is the default timing, nobody has answered this. Probably because the answer is, we don't know. It is part of the Broadcom wireless driver, for which we do not have the source code. You may be able to find the answer by trawling through DD-WRT, Tomato, Oleg, OpenWRT forums, but I doubt it. It is usually set to something short like 100-200m. If anyone does find a figure, maybe they'll remember to come back here and post it.
  8. pharma

    pharma Network Guru Member

    From running DD-WRT firmware in the past using Broadcom hardware, the value in DD-WRT was "0", and I took it to mean literally mean "0". It was only meaningful to change the value if using Atheros according to the DD-WRT firmware help dialog.

    I'm sure if you search in the DD-WRT forum you'll get an answer. :wink1:
  9. Sarkelaru

    Sarkelaru Addicted to LI Member

    In DD-WRT ACK timing not working from Broadcom wireless.
    Tested on my WRT-54GL on 10 Km link Tomato stock is the fastest firmware (20Mb one way transfer)

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