ath(4) and 802.11g speed

JoaoBR joao at
Fri Mar 10 06:32:17 UTC 2006

On Friday 10 March 2006 02:27, Damian Gerow wrote:
> Thus spake Daniel O'Connor (doconnor at [10/03/06 00:19]:
> : > 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

> -----
> mtu 1500 inet6 fe80::20f:b5ff:fe20:71ed%ath0 prefixlen 64 scopeid 0x1
> 	inet netmask 0xffffff00 broadcast
> 	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 


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