Date: Tue, 19 Jul 2005 21:46:08 -0700 From: Sam Leffler <sam@errno.com> To: Michal Mertl <michal.mertl@i.cz> Cc: Robert Watson <rwatson@freebsd.org>, current@freebsd.org Subject: Re: Recent fragility with if_wi, 802.11 adhoc/wep, and Tiger Message-ID: <42DDD710.4030503@errno.com> In-Reply-To: <1121771151.764.42.camel@genius1.i.cz> References: <20050719094905.F15510@fledge.watson.org> <1121771151.764.42.camel@genius1.i.cz>
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Michal Mertl wrote: > Robert Watson wrote: > >>I fairly regularly use 802.11 adhoc with WEP to communicate between my >>6.x/7.x FreeBSD notebook using if_wi, and my Apple PowerBook running Mac >>OS X Tiger. A few days ago, when I updated from a June to a July HEAD >>revision, this became quite "fragile". Specifically, I often find that >>the Mac can't send to the FreeBSD box (ARP fails, etc), and that sometimes >>it will give an error when I ask it to re-connect to the ad hoc network. >>I find that if I ifconfig down/up if_wi, and likewise turn off and on the >>wireless on the PowerBook, it seems to recover. I've not had a chance to >>really try and diagnose this at all -- i.e., does tcpdump show packets on >>either end, 802.11 state machine, etc. I was wondering if anyone else has >>seen this problem, though. > > > Yes, I'm also experiencing similar problems. The problems seem to happen > also with different wireless cards and without wep. They were reported > by Johann Hugo on 14th in an email titled "ath hostap - clients > assosiated, but no comms" too. > > Another problem with WiFi which Johann reported long time ago is that > bridging on atheros (only?) AP works really bad. I get very varying ping > response (50 - inf. ms). Sometimes it seems the packets get queued > somewhere - after some time I receive several replies at once. I routinely bridge ath cards (a wide variety) with bge using bridge and see no problems. I get ~36 Mb/s in 11a w/ superg features and ~28 Mb/s w/ basic stuff (what you find in RELENG_6). ping times are what you'd expect (<1ms). Sam
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