Return-path: Received: from xc.sipsolutions.net ([83.246.72.84]:40421 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752204AbZG3Trj (ORCPT ); Thu, 30 Jul 2009 15:47:39 -0400 Subject: Re: [PATCH] mac80211: use beacons for connection monitoring From: Johannes Berg To: reinette chatre Cc: Ben Greear , "linville@tuxdriver.com" , "linux-wireless@vger.kernel.org" In-Reply-To: <1248975923.1216.1074.camel@rc-desk> References: <1248903159-17024-1-git-send-email-reinette.chatre@intel.com> <4A70C17B.6090309@candelatech.com> <1248949853.29062.3.camel@johannes.local> <1248975923.1216.1074.camel@rc-desk> Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-yIsFCxmXfjfGc2cP6Zhp" Date: Thu, 30 Jul 2009 21:47:05 +0200 Message-Id: <1248983225.10971.5.camel@johannes.local> Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: --=-yIsFCxmXfjfGc2cP6Zhp Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Thu, 2009-07-30 at 10:45 -0700, reinette chatre wrote: > I captured the exchange when this problem occurs using a third system. > The card does indeed try several times to send a probe request and they > are making it out over the air. The AP never responds.=20 >=20 > Is there perhaps anything in this exchange that can help us understand > what is going on? >=20 > No. Time Source Destination Protocol = Info > 163883 401.891153 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D980, FN=3D0, Flags=3D........, SSID=3D"XXX" > 163885 401.891482 00:14:f2:XX:XX:XX 00:16:ea:XX:XX:XX IEEE 802.= 11 Probe Response, SN=3D3557, FN=3D0, Flags=3D........, BI=3D100, SSID=3D"X= XX" It's responding here, > 165523 404.884405 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D981, FN=3D0, Flags=3D........, SSID=3D"XXX" > 165525 404.885265 00:14:f2:XX:XX:XX 00:16:ea:XX:XX:XX IEEE 802.= 11 Probe Response, SN=3D3827, FN=3D0, Flags=3D....R..., BI=3D100, SSID=3D"X= XX" and here, > 166981 407.884161 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D982, FN=3D0, Flags=3D........, SSID=3D"XXX" > 166983 407.884555 00:14:f2:XX:XX:XX 00:16:ea:XX:XX:XX IEEE 802.= 11 Probe Response, SN=3D4034, FN=3D0, Flags=3D........, BI=3D100, SSID=3D"X= XX" and here, > 168133 410.884167 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D........, SSID=3D"XXX" > 168134 410.884430 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168135 410.884643 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168136 410.884904 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168137 410.885073 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168138 410.885330 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168139 410.885580 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168140 410.885769 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168141 410.886618 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168142 410.887087 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168143 410.887308 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" > 168144 410.887532 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Probe Request, SN=3D983, FN=3D0, Flags=3D....R..., SSID=3D"XXX" but then it stops -- try to send that frame 12 times in quick succession. > 168191 411.084889 00:16:ea:XX:XX:XX 00:14:f2:XX:XX:XX IEEE 802.= 11 Deauthentication, SN=3D984, FN=3D0, Flags=3D........ And then give up. Oddly, that frame is not retried?! I would expect that to be retried too if the AP has gone south!? johannes --=-yIsFCxmXfjfGc2cP6Zhp Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJKcfixAAoJEODzc/N7+Qma7l0QAKotb2ZwuU5aXJD7Wm8rW57E Pljpl7SKOz2JpHkZtnO9txpZWe+Jv6KzCVHHPewKYxVgzoPF6NsrX9KG0a0/C0zf gcty/vCQmQGALFw0Kdbch0obn3LM3tpm0IFl9LAKP+0eWlUU6TsXP2R9QlYrDW6P gJnS1BcalZBg4COW8YXJ+BEF74eyVzl7WAZprV83okFows67i6+TfzqafjUoJ/qp 6w38UYaNhYKyLBw16m4nXOBMxCxFfMwd7DdYcjqyPpr47e+v54jUa28YHT2Df+8D QnpOc1d0/TzfbDVQA5DhGwqZLPFTw6YziAZH8+PiAra4T5HLNpbqUIBciWc5cy1A 1NmgJFzpMtLjp3nFzuzeWdo3Pdz83gHXncGhsX7WyQG3Jeh5zEE6FrQe6KYjZyei hgnU//MI9sKSsO+rrQpyKjYz5hGh53NmY53SvrDXWH9rQp0fR9MCk6Mn3jtpBtNk sq6bzTSunGgjL3rHHEmpvq1uzzQXeyTVrjGflzFKCrzTkvE0j2VXp45Dtj6U48Vf /ZiCj4d4+ogm9lph2SKQSsck+iDCa6+ysoVhxYy1Bahf5NloHsWHIcCzgEUlCeCS N2pcEAG1nn0QD3DdsJtbHizMSWm+ijmsdSDrQWDCBZtXtHMNQoyKRvOBd+d5PN8R VU8+nP1wYcjES6KjTNyL =EiDF -----END PGP SIGNATURE----- --=-yIsFCxmXfjfGc2cP6Zhp--