Date: Fri, 10 Mar 2006 01:56:14 -0500 From: Damian Gerow <dgerow@afflictions.org> To: freebsd-stable@freebsd.org Subject: Re: ath(4) and 802.11g speed Message-ID: <20060310065614.GK31158@afflictions.org> In-Reply-To: <200603100329.49920.joao@matik.com.br> References: <20060308231529.GA2049@afflictions.org> <200603101540.21112.doconnor@gsoft.com.au> <20060310052740.GD31158@afflictions.org> <200603100329.49920.joao@matik.com.br>
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Thus spake Daniel O'Connor (doconnor@gsoft.com.au) [10/03/06 01:00]: : Sounds like a question for Sam. Sam? : Actually one thing.. Is the AP set for g mode or b only? 11g mode only. Specifically, autoselect mode 11g, and is currently running at OFDM54. Thus spake JoaoBR (joao@matik.com.br) [10/03/06 01:40]: : > : > Okay, this has me a bit curious, so I dug into it a bit more: : > : > : > : > SSID BSSID CHAN RATE S:N INT CAPS : > : > linksys 00:06:25:7b:25:3d 6 11M 35:0 100 E : > : > MYSSID 00:12:17:85:9a:3b 11 54M 39:0 100 E : > : > wahoo62 00:13:46:47:0f:0e 11 54M 4:0 100 EPS : > : > : > : > I'd have thought that a S:N of 39:0 wouldn't be all that weak, no? : > : > Looking at a post by Sam this past August, he calls 30:0 "very strong", : > : > though that was for an 802.11b link. I'd think that the higher the : > : > number, the stronger the signal. Is the above too weak to handle a : > : > full 54Mbps link? : > : : : generally it is not the signalstrength which let you connect at higher speeds, : it is the noise level. So you can have a low signal without noise and you may : connect at high speed and on the other hand you may have a strong signal and : high noise and the speed is 1Mb or do not connect/associate at all I've been doing some testing with kismet throughout the night, and I've been seeing consistant signal strengths around -50 to -60dBm, with noise sitting pretty consistantly at -96, and its strongest reading (after about six hours) is -90dBm. At least, if I'm to believe what Kismet is telling me. This machine is about five feet (albeit through a concrete wall) from the AP. A wireless laptop that's about twenty feet (again, through concrete) has connected at 54Mbps without issues. : > ----- : > ath0: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,PPROMISC> : > mtu 1500 inet6 fe80::20f:b5ff:fe20:71ed%ath0 prefixlen 64 scopeid 0x1 : > inet 192.168.132.146 netmask 0xffffff00 broadcast 192.168.132.255 : > ether 00:0f:b5:20:71:ed : > media: IEEE 802.11 Wireless Ethernet autoselect <monitor> : > status: associated : : : tha card default in autoselect is probably 11b so it do not connect at 11g : until you configure it to : : ifconfig mode 11g media OFDM/54mbps : : should do the job,, tha card still connect at lower speed depending on what it : can with the selected AP : : in order to not jumping around you can try setting bssid _MAC_desired_AP_ : : so long as your card is in monitor mode you may not connect nor get traffic at : all I don't mind jumping around (the rate selection stuff is there for a reason), it's that I seemed to be stuck at 11Mbps. I've manually set it up to 54Mbps, and still had good network connectivity.
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