Re: [ath5k-devel] ath5k disassociates when physical carrier sensing is disabled
.. and you'll be able to sense ACKs how? :-) Adrian On 29 February 2012 14:25, srinivas prasad wrote: > I thought that it will enable me to transmit without sensing the carrier. I > am a bit new to this so maybe I interpreted it wrong. My aim is to induce > overlaps as many overlaps as possible in our network in our experiments. I > thought by physical carrier sense, i would be able to transmit without > sensing the carrier. > > Thank you > Srinivas > > On Wed, Feb 29, 2012 at 4:02 PM, Nick Kossifidis > wrote: >> >> 2012/2/29 srinivas prasad : >> > Thanks for the reply. Just to make it clear, So are you saying that the >> > patch is buggy? I thought it is supposed to disable carrier sensing >> > (physical and virtual) by turning on and off some flags. >> > >> >> Define buggy. This patch disables carrier sensing on PHY by forcing >> the RX_CLEAR signal to always be high (that means the PHY always >> reports the channel as idle, e.g. allowing you to transmit all the way >> ignoring any other users -some people use that for DoS >> attacks/testing/research etc-) and virtual carrier sensing on MAC by >> telling the PCU to ignore it. It does what's supposed to and as Felix >> told you it effectively kills RX (until you switch them back on). >> >> What did you expect from such a patch/approach ? >> >> -- >> GPG ID: 0xEE878588 >> As you read this post global entropy rises. Have Fun ;-) >> Nick > > > > ___ > ath5k-devel mailing list > ath5k-devel@lists.ath5k.org > https://lists.ath5k.org/mailman/listinfo/ath5k-devel > ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] ath5k disassociates when physical carrier sensing is disabled
2012/2/29 srinivas prasad : > Thanks for the reply. Just to make it clear, So are you saying that the > patch is buggy? I thought it is supposed to disable carrier sensing > (physical and virtual) by turning on and off some flags. > Define buggy. This patch disables carrier sensing on PHY by forcing the RX_CLEAR signal to always be high (that means the PHY always reports the channel as idle, e.g. allowing you to transmit all the way ignoring any other users -some people use that for DoS attacks/testing/research etc-) and virtual carrier sensing on MAC by telling the PCU to ignore it. It does what's supposed to and as Felix told you it effectively kills RX (until you switch them back on). What did you expect from such a patch/approach ? -- GPG ID: 0xEE878588 As you read this post global entropy rises. Have Fun ;-) Nick ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] ath5k disassociates when physical carrier sensing is disabled
I thought that it will enable me to transmit without sensing the carrier. I am a bit new to this so maybe I interpreted it wrong. My aim is to induce overlaps as many overlaps as possible in our network in our experiments. I thought by physical carrier sense, i would be able to transmit without sensing the carrier. Thank you Srinivas On Wed, Feb 29, 2012 at 4:02 PM, Nick Kossifidis wrote: > 2012/2/29 srinivas prasad : > > Thanks for the reply. Just to make it clear, So are you saying that the > > patch is buggy? I thought it is supposed to disable carrier sensing > > (physical and virtual) by turning on and off some flags. > > > > Define buggy. This patch disables carrier sensing on PHY by forcing > the RX_CLEAR signal to always be high (that means the PHY always > reports the channel as idle, e.g. allowing you to transmit all the way > ignoring any other users -some people use that for DoS > attacks/testing/research etc-) and virtual carrier sensing on MAC by > telling the PCU to ignore it. It does what's supposed to and as Felix > told you it effectively kills RX (until you switch them back on). > > What did you expect from such a patch/approach ? > > -- > GPG ID: 0xEE878588 > As you read this post global entropy rises. Have Fun ;-) > Nick > ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] ath5k disassociates when physical carrier sensing is disabled
On 29 February 2012 09:19, srinivas prasad wrote: > Thanks for the reply. Just to make it clear, So are you saying that the > patch is buggy? I thought it is supposed to disable carrier sensing > (physical and virtual) by turning on and off some flags. I don't think that patch does what you think it does, at least not guaranteed on all chips. In fact, I wonder how early those misc mode bits do go back.. Adrian ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] ath5k disassociates when physical carrier sensing is disabled
Thanks for the reply. Just to make it clear, So are you saying that the patch is buggy? I thought it is supposed to disable carrier sensing (physical and virtual) by turning on and off some flags. On Tue, Feb 28, 2012 at 7:22 AM, Felix Fietkau wrote: > On 2012-02-28 3:01 AM, srinivas prasad wrote: > > hi, > > I am using voyage linux(3.0.0-voyage kernel) for my work. All my > > wireless cards are atheros cards(Atheros Communications Inc. Atheros > > AR5001X+ Wireless Network Adapter (rev 01)) and I am using ath5k driver. > > I incorporated the following change to create the interface for enabling > > and disabling carrier > > sensing > https://www.pentoo.ch/svn/portage/trunk/net-wireless/compat-wireless/files/super_secret_patch.diff > . > > Whenever i disable physical carrier sense to induce maximum overlap of > > packets at the AP, the client disassociates from it and is unable to > > reconnect in any successive attempt. I get the following error message > > at the client > I'm pretty sure you're effectively killing Rx. With an essential part of > the card's functionality disabled, of course it's going to assume that > the AP is dead and it'll disconnect - not sure why you'd expect it to > behave differently. > > - Felix > ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
