Thread: [Madwifi-devel] madwifi questions about 802.11
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From: Robin w. <mad...@gm...> - 2008-08-21 02:30:56
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Hi, Everbody I am using madwifi study 802.11. The madwifi runs rightly on my Federa host rather as ap or sta. When runs as sta,I using ominipeek capturing wifi packets at the same time. When this sta(192.168.3.3) ping another sta(192.168.3.119) in the same BSS,I captured 2 arp request packets.One arp reqpacket is "To the DS",other one is "Not an exit from the DS".Then I printk informations by setting print points in function ath_tx_start(..) and function ath_hardstart(...) in source code file if_ath.c. But I can only find one arp req packet is send out in source code. This make me puzzled. I don't know when the other one arp packet is send out in source code. I think it maybe relate to 802.11 protocol. Would you please give me the answer? Thanks! To keep email small size, attached files of capture file and related jpgs are cacelled in this email. Robin 2008-08-21 |
From: Robin w. <mad...@gm...> - 2008-08-21 08:25:57
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Hi, Everbody,I am sorry that I have descripted arp frames infomation something wrong in last email. So rewrite the email below. I am using madwifi study 802.11. The madwifi runs rightly on my Federa host rather as ap or sta. When runs as sta,I using ominipeek capturing wifi packets at the same time. When this sta(192.168.3.3) ping another sta(192.168.3.119) in the same BSS,I captured 2 arp request packets.One arp request packet is "To the Distribution System",other one is "Exit from the Distribution System".Then I printk informations by setting print points in function ath_tx_start(..) and function ath_hardstart(...) in source code file if_ath.c. But I can only find one arp request packet("To the Distribution System") is send out in source code. This make me puzzled. I don't know when the other one arp request packet("Exit from the Distribution System") is send out in source code. I think it maybe relate to 802.11 protocol. Would you please give me the answer or hint? Thanks! Robin 2008-08-21 |
From: Matthew \mentor\ B. <me...@ma...> - 2008-08-23 05:08:27
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Robin wen wrote: > This make me puzzled. I don't know when the other one arp request > packet("Exit from the Distribution System") is send out in source > code. I think it maybe relate to 802.11 protocol. The IEEE 802.11 standard can be found here: <http://standards.ieee.org/getieee802/802.11.html>; it contains a definition of the To/From DS fields meaning and purpose. Matthew W. S. Bell |
From: Robin w. <mad...@gm...> - 2008-08-24 05:37:13
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Thanks for Mr. Mentor's concern of my question. Followed his advice I have download 802.11-2007.pdf and I have found the "from the DS" and "exit from the DS" definition in the manual. But my question is still not resolved. I just want to know which code send the second arp request packet("Exit from the Distribution System"). Is it sent by the madwifi0.9.4 open source code,or is sent by the hardware auto,or is sent by the AP? Why just arp request packt is sent two times? I am using madwifi on atheros 2317 platform as an AP, stas can be authenticated and associated successfully by the Ap, but can't form an full BSS because stas can't ping each other successfully. I have spend much time capture packtes and compare with madwifi0.9.4 runs on Federa host. I don't find the BSS based on my atheros 2317 send arp request packt two times, the second arp request packet("Exit from the Distribution System") is not found. So I think shoud make it clear to me. Would you please give me more hints about this problem. Thanks again. sincerely Robin Wen 2008-08-24 |
From: Cedric B. <bla...@ca...> - 2008-08-24 08:45:12
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Le dimanche 24 août 2008 à 13:37 +0800, Robin wen a écrit : > Is it sent by the madwifi0.9.4 open source code,or is sent by the > hardware auto,or is sent by the AP? By AP. > Why just arp request packt is sent two times? Because it is broadcasted. -- http://sid.rstack.org/ PGP KeyID: 157E98EE FingerPrint: FA62226DA9E72FA8AECAA240008B480E157E98EE >> Hi! I'm your friendly neighbourhood signature virus. >> Copy me to your signature file and help me spread! |
From: Robin w. <mad...@gm...> - 2008-08-25 02:10:34
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Thank you,Mr. Cedric and Mr. Mentor! I have got it. |