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Date:      Tue, 09 Oct 2012 16:58:01 -0700
From:      "Ronald F. Guilmette" <rfg@tristatelogic.com>
To:        rpaulo@FreeBSD.org, freebsd-net@FreeBSD.org
Subject:   Intel 5100 Wifi... more questions.
Message-ID:  <32938.1349827081@tristatelogic.com>

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Ok so I upgraded t FreeBSD 9.0-RELEASE, and now my Intel 5100 is
automagically recognized during boot up.

I have also managed to get it all configured the way I want, and it
is now working just great... well... it is working anyway.

I still do have a couple of questions.  Some things about my setup
are REALLY mysterious.

Firstly, the machine that contains the Intel 5100 Wifi is talking to
my Linksys E1000 router.  This router allegedly speaks, a, b, g, and
also n.

I have set the router to the "N-only" mode and rebooted it... a hard
reboot (power cycled).

Still, despite me having set the router to "N-only" mode, this is what
I am seeing on the client side:

% ifconfig wlan0
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:22:fb:76:6d:18
        inet 192.168.1.23 netmask 0xffffff00 broadcast 192.168.1.255
        inet6 fe80::222:fbff:fe76:6d18%wlan0 prefixlen 64 scopeid 0xb 
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet OFDM/18Mbps mode 11ng
        status: associated
        ssid ronair2-1 channel 11 (2462 MHz 11g ht/20) bssid c0:c1:c0:8b:4b:f3
        country US authmode WPA2/802.11i privacy ON deftxkey UNDEF
        AES-CCM 2:128-bit txpower 15 bmiss 10 scanvalid 450 bgscan
        bgscanintvl 300 bgscanidle 250 roam:rssi 7 roam:rate 64 protmode CTS
        ampdulimit 64k ampdudensity 8 -amsdutx amsdurx shortgi wme
        roaming MANUAL

So I have the obvious question... WTF?  How/why is it that the Intel 5100
seems to be able to speak to a router using 11g (which is obviously is
doing, based on the above output) even though the router has been configured
to speak `N' only??

What am I missing?

OK, so the second question I have is an obvious one too... I want to
get the best speed possible out of this connection.  The router allegedly
supports `N' and the Intel 5100 client allegedly supports `N' also.
How can I force the Intel 5100 to choose `N' rather than `G'?  (It seems
to always be connecting via 11g, even though I would prefer that it connect
via the faster 11n.  I would have thought that it would have been smart
enough, given that it could use either, for it to have selected 11n, but
for reasons know only to the developers, it didn't, so now I would like
to see if I can find a way to force it into 11n.)

I've looked at this (up-to-date?) man page:

    http://www.freebsd.org/cgi/man.cgi?query=ifconfig&sektion=8

and under the "mode" option it only talks about 11a, 11b, and 11g.  WTF?
Does the current incarnation of FreeBSD ifconfig really not even support
11n??

I mean it is not as if 11n were really ``new'' anymore or anything.

Looking forward to any answers.  Thanks.


Regards,
rfg



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