[LUGSB] How to fix wireless reliability problems on campus

[Ahmed Hassan]

s/from/that/

On Wed, Sep 14, 2011 at 10:41 AM, Ahmed Hassan <ahmed at linuxism.com> wrote:

> 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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>>
>>
>
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