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  #1 (permalink)  
Old 12-09-2006, 01:05 AM
shoreke
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Default Linksys Wireless-N

Any opinions on the Linkysys wireless-N router? It got lukewarm
reviews last summer from PcMag and Toms Hardware. There have been
firmware upgrades since then. I've had good luck with Linksys
equipment for years, so despite the negative reviews, I took the
plunge last week and bought the WRT300N router and WPC300N notebook
adapter. My cable modem is the Motorola SB5120. My ISP is Comcast and
I routinely connect at an astounding 270 Mbps. The servers at
Speedtest.net produce download speed results over 15Mbps. I am happy
so far. My only regret is not getting the WRT350N with the wired
gigabit switch.

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  #2 (permalink)  
Old 12-09-2006, 05:37 AM
Jeff Liebermann
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Default Re: Linksys Wireless-N

shoreke hath wroth:

>Any opinions on the Linkysys wireless-N router? It got lukewarm
>reviews last summer from PcMag and Toms Hardware.


Yep. Basically what they said about draft 802.11n routers is that
they don't really offer any improvement over more conventional 802.11g
wireless devices and are anything but interoperable with other draft
802.11n devices.
<http://www.smallnetbuilder.com/wireless/wireless-features/draft_11n_revealed_part1/>
<http://www.smallnetbuilder.com/wireless/wireless-features/draft_11n_revealed_part2/>

>There have been
>firmware upgrades since then. I've had good luck with Linksys
>equipment for years, so despite the negative reviews, I took the
>plunge last week and bought the WRT300N router and WPC300N notebook
>adapter. My cable modem is the Motorola SB5120. My ISP is Comcast and
>I routinely connect at an astounding 270 Mbps.


Holdit. That's your wireless connection speed, not your thruput. My
laptop connects at 54Mbits/sec but only transfers files at perhaps
22Mbits/sec. What you need to do is run a local speed test, without
the cable modem creating a bottleneck.
<http://www.noc.ucf.edu/Tools/Iperf/default.htm>
Run:
iperf -h
for help and syntax examples.

Find a wired ethernet connected PC and run IPerf 1.70 in server mode
as just:
iperf -s

On your wireless laptop, run IPerf as a client as in:
iperf -c ip_addr_of_server

You should get a real file transfer speed, instead of just the
connection speed.

>The servers at
>Speedtest.net produce download speed results over 15Mbps.


Duz your cable ISP offer "burstable" speeds, where the nominal
download speed is 6Mbits/sec, but which might go to several times that
for short periods of time?

>I am happy
>so far. My only regret is not getting the WRT350N with the wired
>gigabit switch.


Maximum wire speed for 100baseT-FDX is typically about 88Mbits/sec.
I'll believe you need more than that when I see the results of IPerf.

This is what I get between my junk desktop and my Panasonic CF-M34
laptop with a Netgear WG511 card going through a WRT54GS v3.? router
with a connection speed of 54Mbits/sec, but where there's all kinds of
traffic moving (SNMP, syslog, ping probes, etc) with the 802.11b
compatibility mode enabled and light 802.11b traffic. It's usually
about 20Mbits/sec but I think I've got some water in my outdoor coax
and antenna. I get roughly the same lousy 16.6Mbits/sec results in
either direction. I'm very interested in what you get with your new
Linksys setup.


C:\IPerf> iperf -c 192.168.1.116
------------------------------------------------------------
Client connecting to 192.168.1.116, TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------
[840] local 192.168.1.11 port 2212 connected with 192.168.1.116 port
5001
[ ID] Interval Transfer Bandwidth
[840] 0.0-10.0 sec 19.9 MBytes 16.6 Mbits/sec

--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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  #3 (permalink)  
Old 12-09-2006, 05:52 AM
Jeff Liebermann
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Default Re: Linksys Wireless-N

Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> hath wroth:

>C:\IPerf> iperf -c 192.168.1.116
>------------------------------------------------------------
>Client connecting to 192.168.1.116, TCP port 5001
>TCP window size: 8.00 KByte (default)
>------------------------------------------------------------
>[840] local 192.168.1.11 port 2212 connected with 192.168.1.116 port
>5001
>[ ID] Interval Transfer Bandwidth
>[840] 0.0-10.0 sec 19.9 MBytes 16.6 Mbits/sec


Turning off 802.11b compatibility didn't help very much:
C:\IPerf> iperf -c 192.168.1.116
------------------------------------------------------------
Client connecting to 192.168.1.116, TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------
[840] local 192.168.1.11 port 2342 connected with 192.168.1.116 port
5001
[ ID] Interval Transfer Bandwidth
[840] 0.0-10.0 sec 21.3 MBytes 17.9 Mbits/sec

I also have frame burst and Afterburner turned off. I've never
benchmarked this particular laptop. Something is wrong... argh!

--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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  #4 (permalink)  
Old 12-09-2006, 07:01 AM
Jeff Liebermann
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Default Re: Linksys Wireless-N

Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> hath wroth:

>Jeff Liebermann <jeffl@comix.santa-cruz.ca.us> hath wroth:
>
>>C:\IPerf> iperf -c 192.168.1.116
>>------------------------------------------------------------
>>Client connecting to 192.168.1.116, TCP port 5001
>>TCP window size: 8.00 KByte (default)
>>------------------------------------------------------------
>>[840] local 192.168.1.11 port 2212 connected with 192.168.1.116 port
>>5001
>>[ ID] Interval Transfer Bandwidth
>>[840] 0.0-10.0 sec 19.9 MBytes 16.6 Mbits/sec


>Turning off 802.11b compatibility didn't help very much:
>C:\IPerf> iperf -c 192.168.1.116
>------------------------------------------------------------
>Client connecting to 192.168.1.116, TCP port 5001
>TCP window size: 8.00 KByte (default)
>------------------------------------------------------------
>[840] local 192.168.1.11 port 2342 connected with 192.168.1.116 port
>5001
>[ ID] Interval Transfer Bandwidth
>[840] 0.0-10.0 sec 21.3 MBytes 17.9 Mbits/sec
>
>I also have frame burst and Afterburner turned off. I've never
>benchmarked this particular laptop. Something is wrong... argh!


I found the problem. The neighbor was using their wireless and I was
picking up the interference. They finally turned off their computer
and went to bed. Now, I get a more normal:

C:\IPerf> iperf -c 192.168.1.116
------------------------------------------------------------
Client connecting to 192.168.1.116, TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------
[840] local 192.168.1.11 port 5463 connected with 192.168.1.116 port
5001
[ ID] Interval Transfer Bandwidth
[840] 0.0-10.0 sec 28.4 MBytes 23.8 Mbits/sec

--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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  #5 (permalink)  
Old 12-09-2006, 03:29 PM
shoreke
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Default Re: Linksys Wireless-N

Hi Jeff,

I have the basic Comcast broadband package. I dont pay for extra for
burstable lines or speedbooster gimmicks to increase extra bandwidth.

There is an easy- as- pie IPERF already configured to run under
Windows XP at
http://www.citynet.net/supportperfor...c=instructions

I ran the test and repeated it. These are my results:

Client connecting to 192.168.1.102, TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------
[1868] local 192.168.1.101 port 1443 connected with 192.168.1.102 port
5001
[ ID] Interval Transfer Bandwidth
[1868] 0.0-10.0 sec 32.1 MBytes 26.9 Mbits/sec


Client connecting to 192.168.1.102, TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------
[1868] local 192.168.1.101 port 1441 connected with 192.168.1.102 port
5001
[ ID] Interval Transfer Bandwidth
[1868] 0.0-10.0 sec 32.0 MBytes 26.9 Mbits/sec

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  #6 (permalink)  
Old 12-09-2006, 04:29 PM
Jeff Liebermann
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Posts: n/a
Default Re: Linksys Wireless-N

shoreke hath wroth:

>I have the basic Comcast broadband package. I dont pay for extra for
>burstable lines or speedbooster gimmicks to increase extra bandwidth.


The last time I checked Comcast locally (Santa Cruz County, Calif),
there was a hard limit at 6Mbits/sec. I'll check with my customers
and see if anything has changed.

>There is an easy- as- pie IPERF already configured to run under
>Windows XP at
>http://www.citynet.net/supportperfor...c=instructions


Thanks. That's the same binary as I was using. Looks like you ran
yours with the default parameters.

>[ ID] Interval Transfer Bandwidth
>[1868] 0.0-10.0 sec 32.1 MBytes 26.9 Mbits/sec


At 26.9 Mbits/sec thruput, you're getting only a bit better than what
I would expect from a good solid 54Mbit/sec connection. You could
probably do better by tinkering with the IPerf parameters as suggested
in the above URL. Also, UDP will go faster than TCP. However, it's a
long way from 270Mbits/sec connection speed and hardly any better from
my stock 802.11g system.

There may be some benifits to MIMO in tolerating internal reflections
and multipath, which will show up as additional range. Comparing your
range with mine is a waste of time because there are just too many
differences. What would be interesting is how far away you can get
between the two MIMO devices and still maintain something close to the
26.9Mbits/sec speed. You'll probably do somewhat better than
conventional 802.11g which is what Tom's Hardware found in their
simulations.

Hmmm... I'm getting consistent failures testing with UDP for some
reason. I'll play with it later.

iperf -c 192.168.1.116 -b 30M
WARNING: option -b implies udp testing
------------------------------------------------------------
Client connecting to 192.168.1.116, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 8.00 KByte (default)
------------------------------------------------------------
[840] local 192.168.1.11 port 1131 connected with 192.168.1.116 port
5001
[ ID] Interval Transfer Bandwidth
[840] 0.0-10.0 sec 35.7 MBytes 29.9 Mbits/sec
read failed: Connection reset by peer

--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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