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Why cant I coonect open wifi at times

Discussion in 'BlackHat Lounge' started by MiLiTARYiV, Sep 12, 2009.

  1. MiLiTARYiV

    MiLiTARYiV Senior Member

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    Anybody know why I can connect to some open wifi's here around my complex but then at other times I cant connect at all even thou there broadcasting and has 3 bar signal strength?
     
  2. evilkarma

    evilkarma Newbie

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    Just because it has 3 bars doesn't mean it's good enough signal to keep a connection, often that's burst signal strength. Highly suggest you use a router with more powerful antennas than a laptop (which i assume youre using) and use it as a signal extender with DD-WRT firmware.
     
  3. jimbobo2779

    jimbobo2779 Jr. VIP Jr. VIP Premium Member

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    If you have connected to a network that has the same SSID (happens with ones called NETGEAR all the time) to another network you previously connected to only the original one had protection and this one doesnt it will try to connect with protection when it isnt needed.

    Basically go into the properties of the connection and set the encryption to none. Happens to me all the time because everyone I know uses NETGEAR and windows is a retard.
     
  4. jazz99

    jazz99 Regular Member

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    Several wifi signals can interfere with one another even if signal strength shows good. Noise slows down wifi and multiple cross signals increase noise. And since most wifi routers broadcast omni-directionally they cannot broadcast very far in a constant manner and tend lose attenuation easily through distance or objects like walls.

    Signal strength indicators are far from accurate. Your best bet is to get a booster card or high-gain antenna to increase your gain and reception.
     
  5. MiLiTARYiV

    MiLiTARYiV Senior Member

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    Will a high gain antenna like this work?
    Code:
    [URL="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250495575350"][B]http://************************/highgain[/B][/URL]

     
  6. azxten

    azxten Junior Member

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    Are you sure it's really an open network?

    A network that has no encryption and is broadcasting SSID might still have MAC address filtering on. This would mean when you try to connect it would start trying and then fail when trying to obtain a network address. If you aren't using DHCP then it would say it's connected but not recieve any data.

    Also, some networks are for strange devices and purposes other than regular WiFi. Look at the picture below. You can see a directional antenna sitting on the chair. I had over 80 wireless networks available at this location. Around 20 of them were "open" but would fail in various ways. I believe those were operated by companies for purposes other than regular wireless access. For example, one strange one that I DID get some information out of turned out to be a water use meter. Every condo had a wireless meter on their water that sent data to a handful of routers spread around the building so they could bill you. You could be looking at something similar, they don't respond normally.

    [​IMG]
     
  7. MiLiTARYiV

    MiLiTARYiV Senior Member

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    Yes its open. I have connected various times and Im connected to it now
     
  8. Doom101

    Doom101 Junior Member

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    maybe its your network card... this happened to me.. updated my drivers and no more problems
     
  9. MiLiTARYiV

    MiLiTARYiV Senior Member

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    Jazz99 already answered the question. THX jazz