[LUGSB] How to fix wireless reliability problems on campus

[Ahmed Hassan]

Where did you read from?
Why don't you make it auto instead?


On Wed, Sep 14, 2011 at 10:34 AM, Ahmed Hassan <ahmed at linuxism.com> wrote:

> RTS/CTS adds a handshake before each packet transmission to make sure that
> the channel is clear.
>
> Fragmentation allows to split an IP packet in a burst of smaller fragments
> transmitted on the medium
>
> http://linux.die.net/man/8/iwconfig
>
> On Wed, Sep 14, 2011 at 10:30 AM, Tony Biondo <tonyb at tonybox.net> wrote:
>
>> What exactly do these settings do?
>>
>> On Wed, Sep 14, 2011 at 9:37 AM, Richard Yao <ryao at cs.stonybrook.edu>
>> wrote:
>> > Dear Everyone:
>> >
>> > For reference purposes, here is a speed test of WolfieNet-Secure after
>> > doing this:
>> >
>> > http://www.speedtest.net/result/1482432493.png
>> >
>> > I could not connect to WolfieNet-Secure from my current location
>> > before I did that tweak, so you can consider any test done prior to my
>> > tweak to have 0 bandwidth both ways with infinite ping times. For the
>> > record, my wireless card is an Intel Ultimate-N 6300, so your speeds
>> > will likely be somewhat slower with wireless G.
>> >
>> > Yours truly,
>> > Richard Yao
>> >
>> > On Wed, Sep 14, 2011 at 9:17 AM, Richard Yao <ryao at cs.stonybrook.edu>
>> wrote:
>> >> Dear Everyone,
>> >>
>> >> If you have problems connecting to Wi-Fi on campus, try the following:
>> >>
>> >> iwconfig wlan0 rts 2347 frag 2346
>> >>
>> >> You will want to change the name from wlan0 to whatever your wireless
>> >> card's name is. You might also want to put it in /etc/local or
>> >> whatever your distribution's init system stores custom boot commands.
>> >> It will not fix wireless deadzones like Javits 111, but it should
>> >> enable you to connect to the campus wireless anywhere anyone else can
>> >> connect. As an added bonus, your download/upload speeds will be higher
>> >> too.
>> >>
>> >> I had been having issues with wireless reliability on campus since I
>> >> started using Linux and this semester, the improvements that were made
>> >> to campus Wi-Fi made it particularly acute. Configuring these settings
>> >> fixed it for me. Now Network Manager behaves comparably to the Windows
>> >> Wireless Zero Configuration. It seems that these settings were meant
>> >> to deal with this exact situation and that Windows has them enabled by
>> >> default. I assume Mac OS X also had them enabled by default given just
>> >> how bad things are on campus without them.
>> >>
>> >> Let me know if it works for you. If all goes well, I will post to the
>> >> kernel mailing list in a week or two informing them of the situation
>> >> so we can get these settings set by default, like on Windows. i.e. You
>> >> are all guinea pigs.
>> >>
>> >> Yours truly,
>> >> Richard Yao
>> >>
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>
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