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Thread: Alfa RTL8187 Driver & Airodump

  1. #1
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    Default Alfa RTL8187 Driver & Airodump

    I've noticed that in BT4 the new Alfa drivers cause airodump to report negative values under the "PWR" column. Also there's no "RXQ" column anymore. Not sure if these are bugs persay. I have noticed a substantial increase in the power of this usb adapter though.

  2. #2
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    I assume it now shows the power in dBm, which is always a negative.

    My home AP gets -41dBm, whilst the neighbours AP yields -61dBm. This behaviour does make sense

  3. #3
    Just burned his ISO
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    Yes, I noticed that to. But to be fair if still works a treat.

    Seemed to crack my wep just fine, not sure if its just me but seemed a bit quicker to!!

    Haven't had a chance to try anything else out yet tho!

    My little one thought it wolud be good to pour her juice in the telly so had a few sparks distracting my attention. Lol.

    Oh yea and fair play to muts and the gang for another outstanding backtrack compliation.

    Peace my fellow ethical hackers. Remember use your power for good!!

  4. #4
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    So if it is in dBm, the smaller the number the closer the AP?

  5. #5
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    Look's like it. Think of it as a reverse scale -

  6. #6
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    I cant connect to wpa with this device from NetworkManager. How can i connect?

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    Exactly, -41 is a stronger signal than -61. If memory serves the dBm scale is logarithmic, which means -41 is twice as strong as -42.

    But that might be my physics knowledge messing up.

    All in all: the negative numbers are not a bug, but a feature

  8. #8
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    the same "-"
    i see it with my Edimax -EW 7318usg

  9. #9
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    hxxp://trac.aircrack-ng.org/browser/trunk/patches/rtl8187_hw_signal_backport_2.6.28.patch?rev=1402

    Can we get this included in the release?

  10. #10
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    Quote Originally Posted by Citruspers View Post
    E If memory serves the dBm scale is logarithmic, which means -41 is twice as strong as -42.
    That's not correct. Doubling the power is equivalent to a 3dB increase in volume! So -40 dBm is double power that -43 dBm
    Don't eat yellow snow :rolleyes:

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