Dear All. I got three people report to me that they always got duplicate packet when the use DWL900AP for their network.
Sincerely -bino- ----- Original Message ----- From: "Charles Steinkuehler" <[EMAIL PROTECTED]> To: "Steve Wright" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Thursday, June 05, 2003 10:51 AM Subject: Re: [leaf-user] Improving wireless link > Steve Wright wrote: > > Charles, > > > > On the basis that there is some distance involved ; (an assumption) > > > > My understanding is that some of the cheaper (dlink in particular) > > wireless gear has 'timing issues' when the A/Ps are physically far apart. > > > > In the extreme, you will have to go to a proprietry fix, viz turbocell, > > or replace the A/Ps with something a little more tolerant of distance. > > > > 802.11 was never intended to travel great distances. Indeed it was part > > of the 802.11 specification to actually prevent (ha ha) this from > > happening - the reason for the proprietry RF connectors. > > > > In summary, many standard 802.11 wireless cards will do great distances > > without getting flaky, but I have heard that the dlink gear is not of > > that category. Other cards such the Orinoco PC-cards combined with > > turbocell work very well indeed at distances up to 20km, and provide > > true data rates in the order of 9MBit/sec (I am told). I don't like the > > idea of proprietry *anything*, and I wish there was an open-source > > 'turbocell'. > > Hmm...I hadn't been aware of the distance issue, but I can see where it > could potentially be a problem. > > I doubt, however, that this is much of a problem in my instance. While > it is a point-point link, the distance is about 1/2 a block (maybe > 400-500 feet, or about 130m). > > If anything, I think my main issue is multi-path, other 2.4 GHz > transmitters nearby, or some other environmental issue. I'm still > trying to get access to a spectrum analyzer to do a proper site survey. > > > In answer to your question, I do not think there is a device you can put > > on the ends of a leaky hose - to make the hose not leak. > > The "hose will still leak", but packet loss in conventional TCP > networking signals network congestion, and triggers exponential backoff. > I have bandwidth to spare over the wireless link, and am looking for > something that makes the link-layer "TCP aware" (or puts a TCP aware > "wrapper" around the link, since I don't have direct access to the > wireless firmware), as discussed in literature for improving TCP > performance over wireless networks...something like the LL-TCP-Aware or > LL-SMART-TCP-Aware link protocols in: > http://www.stanford.edu/~amaaron/ee359/ee359_tcpproj.pdf > > I just don't know if anyone's written anything like this for linux that > I can try to use... > > -- > Charles Steinkuehler > [EMAIL PROTECTED] > > > > > ------------------------------------------------------- > This SF.net email is sponsored by: Etnus, makers of TotalView, The best > thread debugger on the planet. Designed with thread debugging features > you've never dreamed of, try TotalView 6 free at www.etnus.com. > ------------------------------------------------------------------------ > leaf-user mailing list: [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/leaf-user > SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html > ------------------------------------------------------- This SF.net email is sponsored by: Etnus, makers of TotalView, The best thread debugger on the planet. Designed with thread debugging features you've never dreamed of, try TotalView 6 free at www.etnus.com. ------------------------------------------------------------------------ leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
