Packet loss on an 11 mile link...

Curtis V. Schleich cvslist
Mon Sep 8 08:55:34 PDT 2003

Good, thanks!  I've dropped the speed on the ap to 5.5M, I'll watch to see
if that makes the difference.  In the meantime, I wonder if RTS or Frag
threshhold should be turned on, and if so, what are appropriate value ranges
to experiment with?  Here's output from my iwconfig on the AP interface:

wlan0     IEEE 802.11b  ESSID:"xxxxxxxxx"
          Mode:Master  Frequency:2.437GHz  Access Point: xx:xx:xx:xx:xx:xx
          Bit Rate=5.5Mb/s   Sensitivity=1/3
          Retry min limit:8   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:32  Rx invalid frag:0
          Tx excessive retries:706  Invalid misc:44107   Missed beacon:0

This is shortly after a reset, so I'm wondering if the Tx Excessive retries
or invalid misc are indicating anything specific.  DMESG output does not
report anything.  Is there any specific way that I can understand these
values better?

Thanks, all!

Curtis V. Schleich,
CCAonline, Inc.

----- Original Message ----- 
From: <tom at>
To: <cvslist at>; <hostap at>
Sent: Monday, September 08, 2003 9:23 AM
Subject: RE: Packet loss on an 11 mile link...

I'm going to go ahead and say that it's a timing issue.  What
rate is the link running at currently?  If you're trying to run an
802.11b network at 11Mbit, you may have some issues.  Try stepping the
speed down, and see if that resolves things.

Good Luck,
Thomas Cameron

-----Original Message-----
From: Curtis V. Schleich [mailto:cvslist at]
Sent: Monday, September 08, 2003 9:23 AM
To: hostap at
Subject: Packet loss on an 11 mile link...

Hello all.  I've recently been fighting a packet loss issue on an 11.1
mile link.  Radio signal strength seems to be decent, but we've got
between 5 and 10 percent packet loss, and the link is pretty unusable.
Does anyone know any parameters that I can tune the hostap software with
to increase the reliability of this link?  Packet loss on closer links
to the same AP are only slightly lossy, but it's still there.

I'm using the CVS version of hostap downloaded on August 25th, kernel
version 2.4.22, kernel pcmcia on a RedHat 9 machine.

Any suggestions are welcome!

Thanks for your time!

Curtis V. Schleich,
CCAonline, Inc.

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