Wireless Support
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I have looked for a day and have not been able to find a section on pfSense where they would list the supported cards for wireless and wired.
Someone should add that to the site to help new people that have cards and want to use this.My wireless card: D-Link Wireless N DWA-552
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Then you obviously didn't look hard enough
http://pfsense.com
–> Hardware --> Compatibility List -
There is no support for "wireless N" cards in pfSense 1.2.3.
There is some support for some "wireless N" cards in pfSense 2.0 which is still under development.
In common with many open source projects, with pfSense it is better to check the support for a particular piece of hardware before buying it rather than buy the hardware and then look for support.
http://doc.pfsense.org/index.php/Supported_Wireless_Cards describes some of the problems with recommending particular wireless cards.
My usual source for finding the type of chipset in wireless cards (http://linux-wless.passys.nl/) doesn't appear to list your card. Unless you are prepared for the discomfort and discouragement of being a pioneer you would probably be better off using a TP-Link TL-WN651G (PCI card, uses Atheros chipset) or Tenda W54P. I've had satisfactory experience with the TP-Link TL-WN651G on pfSense 1.2.3 but others have been less impressed. I have no experience with the Tenda W54P but the chipset it apparently uses is supported in pfSense 1.2.3. In USB devices I've had good experience with light usage of TP-Link TL-WN321G and D-Link DWL-G122 rev C1 (both supported by rum driver) in pfSense 1.2.3 but the rum driver in snapshot builds of pfSense 2.0 is broken for hostap and ad-hoc modes.