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" <s...@errno.com>
To: "Sin" <sinis...@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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