On 28 Aug 2005 11:15:58 -0700, "jim.mauro@gmail.com"
<jim.mauro@gmail.com> wrote:
>I upgraded my home network, replacing a LinkSys BEFW11S4 with a new
>WRT54GS.
>Laptop cards for the family laptops were also upgraded to WPC54GS
>cards.
>
>I have Verizon DSL, with 1.5Mbit provisioned.
>
>With my old BEFW11S4, I would consistently get 1.2-1.3Mbit down on
>speed tests.
That's the speed limit established by your DSL provider for
1.5Mbit/sec DSL service. Your BEFW11S4 can do up to about 5Mbits/sec.
>With the new WRT54GS, I taking a huge regression - 200k - 400k down, at
>best.
>Download speed is 4X-6C slower.
I can't tell if the speed problem is coming from the DSL or from the
wireless. If Verizon DSL is having a bad day, you'll see slow
performance. I suggest you use two computahs, one with a wired LAN
connection to the WRT54GS, the other wireless to run benchmarks. I
suggest you use IPerf:
http://www.noc.ucf.edu/Tools/Iperf/default.htm
That will take the DSL speed out of the picture.
>I do not have security enabled.
>
>I'm basically using default settings - same settings I had on the
>BEF11S4.
>
>LinkSys (tech support via email) suggested I change RTS Threshold to
>2304 (from 2432) and Fragementation Threshold to 2304 (from 2346). They
>also suggested I change DTIM from 1 to 3.
Waste-o-time. This has nothing to do with your problem.
RTS threshold turn on flow control and is useful if you are
experiencing hidden transmitter problems. This really only happens in
outdoor WLAN's with lots of users. Fragmentation threshold is useful
if you're experiencing inteference. It will reduce the packet size
down to the point where the packets have a better chance of getting
through the interference. DTIM is the time that it beacons. Changing
the beacon interval from 100msec to 300msec isn't going to do anything
useful. Put these back to defaults please.
My guess is that your unspecified wireless client radio is an 802.11b
only radio. The 108Mbit/sec wireless devices have problems with some
of these cards. I suggest you dive into the Wireless settings on the
WRT54GS and disable all the enhancements such as turbo mode.
>My limited knowledge of what these advanced wireless settings do leave
>me very skeptical as to whether or not they'll fix a 6X bandwidth
>regression, but I will try them and post the results (right now, I'm
>back on the BEFW11S4, until my kids tell me it's OK to take the network
>down :^).
The kids take priority. You're correct to be suspicious. Those
tweaks will do nothing.
Any chance that the BEFW11S4 and WRT54GS are on different channels?
If you have a neighbor with an access point on the WRT54GS channel, it
could explain the slowdown.
>I'm open to the possibility there's something wrong with the WRT54GS,
>and if (when) the LinkSys suggestions do not fix the problem, I will
>exchange it for a new one.
Find a friend or acomplis that has a known working 802.11g laptop.
Test your router with their laptop. Also, do the benchmarking using a
LAN connected computer (as previously mentioned) as you may be
benchmarking Verizon DSL.
>Just a heads up on an odd problem doing a simple (and otherwise
>painless) upgrade of the home LAN from
>'b' to 'g'.
Did you also update the wireless client radio? If so, you're
troubleshooting two things at once. Bad idea. If there's a new
802.11g card in the laptop, drag it to the local free wireless hot
spot and do some testing with a known good router.
>I will post findings, results.
>
>/jim
--
Jeff Liebermann
jeffl@comix.santa-cruz.ca.us
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060
http://802.11junk.com
AE6KS 831-336-2558
LinkSys WRT54GS performance issue 
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