How connect 2 PC with ath in hostap mode ?

[Andrey Smagin]

Hello Marcin,

Tuesday, October 4, 2005, 11:35:17 AM, you wrote:


MJ> How are you bridging the interfaces? What kind of bridging mechanism
MJ> are you using?

 In FreeBSD:
  kldload ath, ath_hal, bridge, fxp

On both host:
  ifconfig_ath0="inet ssid 1234 channel 6 mode 11g mediaopt adhoc"
in sysctl.conf
  hw....bridge.config=ath0:1,fxp0:1
  hw....bridge.enable=1
  
  ipfw allow ip from any to any
  
in this mode speed about 8KBy/s

  ifconfig_ath0="inet ssid 1234 channel 6 media OFDM54 mode 11g mediaopt adhoc"
increase speed up to 45-50 KBy/s


Bridging work fine and uptime for both host more
wheek under full load :) (40KBy/s over wireless)
Some strange - ping report low average delay about
0.700ms for any host in another net segment.


MJ> Anyway, the difference in speed is indeed strange.
MJ> Try to set following:
MJ> sysctl dev.ath.0.tpscale=1
MJ> sysctl dev.ath.0.tpc=1
MJ> sysctl dev.ath.0.diversity=0
MJ> ifconfig ath0 protmode off
MJ> ifconfig ath0 mtu 2290
MJ> You could also use device tap (virtual ethernet) and connect two lan's
MJ> that way running one link in hostap and the other bss mode. Check out
MJ> the vtun port.
Thanks i will try it.

MJ> I am not sure why you have such a speed loss running in adhoc mode.
MJ> What I noticed on NetBSD (where the ath driver is not yet fully ported)
MJ> was I got pretty decent speed with the same setup as yours (2xath in
MJ> adhoc bridged with wired nics) but my embedded devices allways crashed
MJ> when I sent over many small packets.
  I think this is a driver problem, two ap sucessfully connect
with each other, why hostap can't do this ? I tested D-Link 624 WiFi router,
D-Link 2100AP, DWL-520+, DWL-G520. On DWL-520+ - acx chipset, it speed not
more 8KBy/s with adhoc<=>adhoc connection(but under W2K it have fullspeed
800KBy/s in this mode). I bought DWL-G520 on ath chipset, upgraded hosts
hardware up 850MHz processor, new MB, more RAM, but it not resolve the
problem, with 54MBit/s connection, speed is too small. D-Link AP, with WiFi
router have good connection and speed 38MBit/s(2MBy/s).





-- 
Best regards,
 Andrey                            mailto:samspeedu at mail.ru