Force 802.11b mode for a wireless adapter
Hello, I would like to know how to force a wireless adapter to work on the 802.11b band only (this is, make it so it does not use g/n).
Thanks
Butcher wrote:I don't really think that is going to help. (It does not.)
That's probably because your wifi device driver module doesn't support enforcing 802.11b mode, like my b43:
# iwconfig wlan0 modu 11b
Error for wireless request "Set modulation" (8B2F):
SET failed on device wlan0 ; Operation not supported.
Does forcing a slower rate without changing mode help, in your casee?
# iwconfig wlan0 rate 11M
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This question was solved.
View Solution.Yes. HP locks down the BIOS and if you install anything other than very specific wifi adapters the system will not POST. You are correct in thinking the Ralink is not the strongest option. Your best bet is Atheros or Intel in that order. Broadcom cards are a bit hard to configure with Linux but it can be done. Here is the entire list of wifi cards with part numbers that you can use:
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Disabling 802.11b, what issues to coverage?
Hi All
I want to soon disable 802.11b support on our AP 1231 with B/G cards. I want this because I don't like to have 802.11b clients connecting and taking down the speed.
The question now is, how would our signal coverage change if I put 'power local cck 1' on the device?
Or I would only allow theese rates:
6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 which are only supported by 802.11g cards.
Would that change the signal range a lot? Or do you have better ideas to disable 802.11b support?
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PatrickHi Patrick,
Here is some info related to disabling 802.11b;
Q. How can I set the AP so that only IEEE 802.11g clients can connect? I do not want the IEEE 802.11b clients to connect and slow down the wireless network. There is a second, parallel 802.11b network for unsecured clients.
A. In order for the AP to receive only 802.11g clients, complete these steps in the GUI:
Go to the Network Interfaces section and click Radio 0-802.11G.
Click the Settings tab at the top of the Radio 0-802.11G window.
Choose Disable for these data rates:
1.0
2.0
5.5
11.0
Choose Require for all the other data rates. These other data rates are:
6.0
9.0
12.0
18.0
24.0
36.0
48.0
54.0
Click Apply at the bottom of the window.
From this good doc;
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_qanda_item09186a008009483e.shtml
As for coverage; A fundamental rule is that as data rates increase, range decreases. 802.11b uses DSSS to support data rates of 11, 5.5, 2, and 1 Mbps each, with correspondingly longer ranges as the data rates decrease. 802.11g uses OFDM to support data rates of 54, 48, 36, 24, 18, 12, 9, and 6 Mbps each, with correspondingly longer ranges as the data rates decrease. The higher data rates supported by 802.11g result in shorter range than the range supported by the maximum 802.11b data rate. Still, OFDM is a more efficient means of transmission than is DSSS, meaning that at a given range, higher OFDM-based data rates will be supported than DSSS-based data rates (all other things being held constant). That being said your range difference should not be too drastic
From this superior Cisco doc (Have a look at Table 4 for some good Range approximations);
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_white_paper09186a00801d61a3.shtml
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Rob -
AP with 802.11 G Vs clients with 802.11b
hi
i've got more access point 1200 series with he 802.11g but the client are 802.11b . Can the client 802.11b connect at the AP with 802.11 G ? Now i don't resolve this problem anche the client 802.11b connect only with the ap 1200 series with 802.11b
Thanks for all> If you disable the "b" data rates, you've pretty much blocked "b" clients.
A-ha... As i can understand i must disable 1.0, 2.0, 5.5 and 11.0 speed's.
"To set the 2.4-GHz, 802.11g radio to serve only 802.11g client devices, set any Orthogonal Frequency Division Multiplexing (OFDM) data rate (6, 9, 12, 18, 24, 36, 48, 54) to Basic."(c) Cisco IOS Software Configuration Guide for Cisco Aironet Access Points 12.3(7)JA
This the same thing as entering `speed throughput ofdm`? Command disables all 802.11B data rates as you recommend.
> They may be able to respond / attempt association (that all happens at either one or two mbps for either "b" or "g" ... long or short preambles), but since they dont have compatible data rates, they can never connect.
I know... But, AFAIK, when 802.11G AP "see" 802.11B client in his coverage area AP "downgrades" to 802.11B to allow this client associacion. Your recommedation prevents this, i'm right? Try to understand me, many years i used damn D-Link (my boss love it) but one day i sad "Cisco or on no any kind wireless :E" and now i have dosens AP-1200 with my many questions... All want now i want - is set "G-only" (in dlink's terms) like function...
Thank you
P.S. Sorry for my english -
My Long Range USB wireless adapter (Alfa, Ralink AWUS052NH) continuously disconnects. Every 15 seconds a beep comes, the adapter can be seen in the networkscreen an then disappears. Also the Mediatek Wireless Utility does not work.I downloaded latest drivers but no effect. How can this be solved?
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Intel Centrino Advanced-N 6235 670292-001
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Realtek RTL8188EE 802.11bgn Wi-Fi Adapter 709848-001
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