[c-nsp] How to measuse the throughput on Internet Links

[Ramcharan, Vijay A]

If you just need to do a blind bandwidth test, it's possible to use
iperf to test your link one-way outbound without really needing a
receiver at the other end. See below for an example. You'd just need to
tweak the iperf settings to achieve your desired traffic rate. 10M below
means use a 10Mbps bandwidth. I ran 2 streams which would correspond to
the avg 20Mbps SUM bandwidth noted.  
If you have a few high speed Internet users you could probably test
inbound as well. The test below was run from a Win2K server just behind
the router to an IP address reachable by that router across a DS3. Note
that iperf consumed 100% CPU on this server during the test so use
caution when testing. 
I've also tested locally and was easily able to generate 100Mbps of
traffic off my fairly fast PC.  

Since you appear to want to gauge real max bandwidth possible you'll
probably want to try using TCP with a real receiver at the other end to
gather stats from both the iperf sender and receiver as well as your
router. 
 
C:\Program Files\iperf-2.0.2\bin>iperf -c 192.168.255.21 -u -b 10m -P 2
-f k -t 600
------------------------------------------------------------
Client connecting to 192.168.255.21, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 63.0 KByte (default)
------------------------------------------------------------
[  4] local 63.91.167.53 port 1738 connected with 192.168.255.21 port
5001
[  3] local 63.91.167.53 port 1737 connected with 192.168.255.21 port
5001
[  4]  0.0-600.0 sec  729444 KBytes  9959 Kbits/sec
[  4] Sent 508130 datagrams
[  3]  0.0-600.0 sec  731400 KBytes  9986 Kbits/sec
[  3] Sent 509492 datagrams
[SUM]  0.0-600.0 sec  1460844 KBytes  19945 Kbits/sec
read failed: Connection reset by peer
read failed: Connection reset by peer
[  4] WARNING: did not receive ack of last datagram after 1 tries.
[  3] WARNING: did not receive ack of last datagram after 1 tries.



DS3-RTR5#sh int s2/0
Serial2/0 is up, line protocol is up 
  Hardware is DSXPNM Serial
  Internet address is 1.2.3.4/30
  MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, 
     reliability 255/255, txload 107/255, rxload 1/255
  Encapsulation HDLC, crc 16, loopback not set
  Keepalive set (10 sec)
  ...
  5 minute input rate 48000 bits/sec, 68 packets/sec
  5 minute output rate 18560000 bits/sec, 3067 packets/sec
 ... 
 DSU mode 0, bandwidth 44210, real bandwidth 44210, scramble 0
DS3-RTR5#
 
Vijay Ramcharan  
  
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of omar parihuana
Sent: January 09, 2008 11:57
To: Michael Long; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] How to measuse the throughput on Internet Links

Hi Michael,

thanks for your response....

I tried to use IPERF previously without success because set up the
server
was difficult for me. I'm looking for other options.

Thanks again
Rgds.


On 1/9/08, Michael Long <mlong at mikesoffice.org> wrote:
>
> iperf. http://dast.nlanr.net/Projects/Iperf/
>
> Although you'll need a client and server setup. Plus it helps if the
> server is somewhat close to the link you are trying to test.
>
> Mike
>
> omar parihuana wrote:
> > Hi guys,
> >
> > I bought a new Internet Link 40Mbps 1:1 that is provide with
> FastEthernet
> > interface, now, I would like to check if I have the 40Mbps
effective.
> How
> > can I measure the max capacity of my Internet link? any suggestions?
> >
> > Thanks in advanced...
> >
> > Rgds.
> >
>



-- 
Omar E.P.T
-----------------
Certified Networking Professionals make better Connections!
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