airport extreme bridge?

spaceballl

macrumors 68030
Nov 2, 2003
2,856
240
San Francisco, CA
Is your main router an Airport device? Or some other device, if it's an airport device then you just need to set the checkbox to allow the network to be extended. Otherwise, you can use WDS mode. I've linked to some relevant threads with info.
Here's one.
And another
 
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