Recent fragility with if_wi, 802.11 adhoc/wep, and Tiger
Sam Leffler
sam at errno.com
Wed Jul 20 04:45:41 GMT 2005
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
More information about the freebsd-current
mailing list