[olug] WRT (was: Tonight's meeting)

Thu Sep 6 02:54:08 UTC 2007

Even with a 54Mbps 11g connection, 54Mbps is the maximum theoretical
throughput of the technology.  Since a radio cannot transmit and
listen at the same time, you automatically have to cut this number in
(approximately) half.  "Typical" throughput rates are measured in the
mid teens to low 20's (Mbps).  11g also doesn't get near the distance
as 11b.

Lastly, you've got to consider your environment.  Coordless phones,
microwave ovens, baby monitors, neighboring APs, etc. all cast
interference in the 2.4GHz spectrum.  This interference can lead to
dropped packets which really hurts TCP's potential throughput.

Of course, 3Mbps wireless compared to 10Mbps on the wired side does
seem a little low.  Then again, it wasn't that long ago when 4Mbps
down was the fastest you could get with COX.

On 9/5/07, Sam Tetherow <tetherow at shwisp.net> wrote:
> What is the connection rate on your wireless connection?  You are going
> to get actual throughput at a little under half the air rate (so 11Mbps
> 802.11B really only gets you a maximum of about 4.5M data rate).
>
> Assuming you are managing a 56Mbps 802.11g connection, then next thing
> to try is changing channels.  Inside a home this usually isn't a proble,
> but depending on where the router and/or laptop are located it can make
> a difference (especially if near a window or in an apt complex).
> Channel choice is entirely environment dependent but 1 or 11 may be
> better than the stock channel 6.  If 1 and 11 don't help, you can walk
> through each channel and test.
>
> I would be surprised that the router couldn't handle it's maximum over
> the air data rate using a standard setup.
>
>     Sam Tetherow
>     Sandhills Wireless
>
>
> Travis Owens wrote:
> > This struck a chord with me, since my new Linksys WRT54G (V8) is
> > having significant wireless speed issues. I understand there is
> > potential loss of speed compared to wired connections, but we're
> > sitting within 20 feet of the router, and our wired speeds are +10M/s
> > easily... wireless is 3M/s at best...
> >
> > The preliminary research I've done so far, points to an upgrade to
> > dd/open-wrt as helping, but saying it's never going to be the same...
> >
> > I'm not asking for the same, but good grief... paying for a 12M/s pipe
> > and only getting 1/4 of it... I think not...
> >
> > Anyway, I figured to toss this out there and see if anyone has had
> > similar experiences, or any suggestions to fix it.
> >
> > Thanks!
> > Travis
> >
> >
> > On 9/4/07, Rob Townley <rob.townley at gmail.com> wrote:
> >
> >> i am working on a presentation for alternative firmware for SOHO firewalls
> >> with a focus on dd-wrt.
> >>
> >> Afterall,  today is dd-wrt's creator BrainSlayer's BirthDay!
> >>
> >> i will be bringing Buffalo and Linksys wireless routers installed with
> >> DD-WRT and some unflashed fon.com routers.   If time, i will flash one back
> >> to Linksys firmware and then run through the staging to install dd-wrt.  If
> >> anyone has a wireless router they want to run a very small risk of flashing
> >> with dd-wrt, then please bring it.  If your router is "bricked", then you
> >> may have an expensive paperweight, but that has not happened to me.  A list
> >> of supported hardware can be found here:
> >>
> >> http://dd-wrt.com/wiki/index.php/Supported_Devices
> >>
> >> If you have LinkSys wrt-54g with a serial # that starts with CDFA, then you
> >> have a good router for this project.  Since the newer routers have less RAM,
> >> dd-wrt has a micro-edition for these.  BrainSlayer recommends Buffalo
> >> branded routers - the last i heard anyway.
> >>
> >> An example of why alternative firmwares can be so much better and even more
> >> secure than the factory firmware.
> >>
> >> There probably will not be enough time to flash the fon.com routers (that
> >> can take 10 minutes just for the reflash), but i will bringing 1 or 2 in
> >> case there is interest.
> >>
> >>
> >> On 9/4/07, Jon Larsen <relayer at levania.org> wrote:
> >>
> >>> InstallFest Followup
> >>> OLUG Discussion
> >>> Q&A
> >>> Unconfirmed: WRT firmware discussion
> >>>
> >>> Jon L.
> >>>
> >>> On Tue, 4 Sep 2007, Travis Owens wrote:
> >>>
> >>>
> >>>> Date: Tue, 4 Sep 2007 11:44:36 -0500
> >>>> From: Travis Owens <openbook1441 at gmail.com>
> >>>> Reply-To: Omaha Linux User Group <olug at olug.org>
> >>>> To: Omaha LUG <olug at olug.org>
> >>>> Subject: [olug] Tonight's meeting
> >>>>
> >>>> What's going on for tonight's LUG meeting? I don't remember seeing
> >>>>
> >>> anything yet.
> >>>
> >>>> Thanks!
> >>>>
> >>>>
> >>> --
> >>> Jon H. Larsen  - relayer -at- levania -dot- org
> >>> Operations Manager, Omaha Linux Users Group - http://www.olug.org/
> >>> AnimeSunday.org - http://www.animesunday.org/
> >>> Website - http://www.levania.org/~relayer/
> >>> GPG/PGP Pubkey - http://www.levania.org/~relayer/relayerpubkey.txt
> >>> _______________________________________________
> >>> OLUG mailing list
> >>> OLUG at olug.org
> >>> http://lists.olug.org/mailman/listinfo/olug
> >>>
> >>>
> >> _______________________________________________
> >> OLUG mailing list
> >> OLUG at olug.org
> >> http://lists.olug.org/mailman/listinfo/olug
> >>
> >>
> >
> >
> >
>
> _______________________________________________
> OLUG mailing list
> OLUG at olug.org
> http://lists.olug.org/mailman/listinfo/olug
>