Date: Wed, 2 Sep 2009 11:34:30 -0400 From: Sin <sinister@gmail.com> To: "Sam Leffler" <sam@errno.com>, "Sin" <sinister@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: toggle short / long preamble with hostapd Message-ID: <C3B4A04A39B74965AFA22B0A62876DB1@dts> References: <4790A7EF670C4698ADB76933788A218F@dts> <4A9E8C68.3060300@errno.com>
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Sam, Basically I have a dlink WBR-1310 thats in bridge mode connected to my current BSD router ( 6.3) I'm trying to replace this 1310 product with FreeBSD 7. The last problem i'm dealing with is poor preformance. When I use my current BSD 7 setup it works, but ping times from client to another or even to the access point are bad. 100 - 400ms round trip. I had this exact problem with the 1310. The fix was to change from long to short preable. Been fine ever since. I used three computers to prove this before emailing. Just swapping the 1310 for the 7-STABLE corrects this. The 1310 uses g only mode with short preamble getting less then 5ms ping times to each client and host and vice-versa I realize that hostapd.conf is just for the encryption. However ifconfig and ath man pages do not talk about this setting. ----- Original Message ----- From: "Sam Leffler" <sam@errno.com> To: "Sin" <sinister@gmail.com> Cc: <freebsd-net@freebsd.org> Sent: Wednesday, September 02, 2009 11:16 AM Subject: Re: toggle short / long preamble with hostapd > Sin wrote: >> Hello, >> >> >> Does anyone know how to enable short preamble in 7-STABLE ? >> >> I'm using ath with hostapd in ap mode. It seems there was an option in >> hostapd.conf, but this is not in FreeBSD's >> /usr/share/examples/hostapd/hostapd.conf >> >> >> The missing hostapd.conf option was found in google: >> >> # Short Preamble >> # This parameter can be used to enable optional use of short preamble for >> # frames sent at 2 Mbps, 5.5 Mbps, and 11 Mbps to improve network >> performance. >> # This applies only to IEEE 802.11b-compatible networks and this should >> only be >> # enabled if the local hardware supports use of short preamble. If any of >> the >> # associated STAs do not support short preamble, use of short preamble >> will be >> # disabled (and enabled when such STAs disassociate) dynamically. >> # 0 = do not allow use of short preamble (default) >> # 1 = allow use of short preamble >> #preamble=1 >> >> >> my version of hostapd is " v0.5.10 " - I was not able to set this option > > On freebsd hostapd is _purely_ an authenticator; to configure 802.11 > parameters you use ifconfig. > >> >> >> hostapd.conf: >> >> interface=ath0 >> #preamble=1 >> debug=1 >> ctrl_interface=/var/run/hostapd >> ctrl_interface_group=wheel >> ssid=private >> wpa=1 >> wpa_passphrase=apassword >> wpa_key_mgmt=WPA-PSK >> wpa_pairwise=TKIP >> >> >> >> rc.conf: >> >> hostapd_enable="YES" >> ifconfig_ath0="mode 11g hidessid mediaopt hostap" >> >> >> >> ifconfig ath0: >> >> ath0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 >> mtu 1500 >> ether 00:17:9a:4c:e7:83 >> media: IEEE 802.11 Wireless Ethernet autoselect mode 11g <hostap> >> status: associated >> ssid private channel 1 (2412 Mhz 11g) bssid 00:17:9a:4c:e7:83 >> authmode WPA privacy MIXED deftxkey 2 TKIP 2:128-bit TKIP >> 3:128-bit >> txpower 31.5 scanvalid 60 bgscan bgscanintvl 300 bgscanidle 250 >> roam:rssi11g 7 roam:rate11g 5 protmode CTS burst hidessid >> dtimperiod 1 > > In ap mode you should not manually configure preamble; it should be > selected according to the associated stations. What are you trying to > accomplish? > > Sam >
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