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I have a linksys wrt router and i was wondering if it can also be used to not only setup a wifi network but also connect to existing ones and share the connection via its lan ports?

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If you have a 2nd router you can set up a wireless bridge. – cutrightjm Apr 14 '13 at 16:15
up vote 2 down vote accepted

This is absolutely possible, it's known as wireless bridging. Depending on your model it's most easily achievable using 3rd party firmware such as DD-WRT or Tomato, the latter being preferred if your router is compatible.

See here:

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I wouldn't say one is preferable to the other. They both have pros and cons and are both far more powerful than default home router firmware. It mostly comes down to preference. – MaQleod Apr 15 '13 at 1:24
It's subjective, but in terms of fitting the purpose of the user asking the question most would agree it's simpler to set-up things like bridging with Tomato's very intuitive interface. – deed02392 Apr 15 '13 at 13:51

I'm guessing what you're trying to say is that you want to use your router as a wireless receiver. This site might help:

If you want to strengthen your wifi coverage by resharing (bridging) the signal by another router look up router bridging.

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