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From: Chris Rees <utisoft@gmail.com>
Date: Fri, 23 Jul 2010 15:54:29 +0100
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To: Eitan Adler <lists@eitanadler.com>
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Subject: Re: why do I require "WPA" in rc.conf even for open networks.
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On 23 July 2010 03:03, Eitan Adler <lists@eitanadler.com> wrote:
> For some reason I can not connect to *any* wireless network regardless
> of the connection type unless I have "WPA" in /etc/rc.conf right
> before "DHCP". Why would I require this to connect to open networks?
>
> --
> Eitan Adler

WPA means that wpa_supplicant is used, which can connect to any type
of network, not just WPA.

I suggest you read the man page at man 8 wpa_supplicant

Chris