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Can we use an Android phone as a Wi-Fi repeater?

I have my home router which for a variety of reasons I can not switch to WEP. However, I occasionally need to use my Nintendo DS to connect to Nintendo WFC, and it can only use a WEP connection. My current method is to use the Wi-Fi Hotspot feature of my HTC Desire HD to create a temporary WEP network and connect to that using my DS. This is fine, except it forces my phone to use my carrier's data connection instead of my home wireless network, bringing with it associated charges if I hadn't used the internet on my phone that day already.

Is there anyway to share a wireless network instead of the mobile network via the Wi-Fi Hotspot feature?

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    I'm hesitant to say "no" in an answer since it's hard to prove a negative, but generally speaking this would require your wifi chip to be in two modes at the same time. This is usually not possible, and would require some other connection between the DS and the phone (if nobody yells at me then I might just re-post this as an answer - I'll Google around in the meantime...).
    – eldarerathis
    Mar 25, 2011 at 20:23
  • Just to be clear - you want to connect your DS to your phone via wifi and then use the wifi connection between your phone and the router for data?
    – Daniel
    Mar 25, 2011 at 20:32
  • @Daniel: Correct.
    – Macha
    Mar 25, 2011 at 20:39
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    Color me impressed: It's actually possible to rebroadcast a wifi signal with only a single card on Win7 using Connectify. Evidently aircrack might have similar capability on Linux, but that's not completely clear from what I'm reading so far. I'm not finding anything similar for Android, though...
    – eldarerathis
    Mar 25, 2011 at 20:40
  • @Macha Interesting - I'm going to give this a shot tonight when I get home. I'm guessing you are not using a custom ROM
    – Daniel
    Mar 25, 2011 at 20:41

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The Desire HD can not be a gateway that supports rebroadcasting wifi with a different encryption, at best you could add an encryption from an open point or broadcast it as open from a secure point.

You would also need two antennas, and the chip does not.

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I don't know if the MobileAP setting on my Galaxy S is the "Official" Mobile Access Point component for 2.2-Froyo, but if I try to enable MobileAP when I am already connected to wifi, it tells me that I must first disconnect from wifi before I can share any type of data connection.

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