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Community Member

Saturate a link.

Good day,

I have a p2p wireless link, the manufacturer put the theorical bandwith to 48Mbps. I want to saturate the link, and mesure exactly the real bandwith; i try it with ftp expert but i can't sature with it. Some body has a method of saturation ?

Any suggest will be appreciated.

regards.

8 REPLIES
Bronze

Re: Saturate a link.

Multiple two way transfers both ways would definitely push the link to its maximum capacity. One way transfers are not an ideal way of measuring the throughput because of the way TCP/IP works.

Start 2 ftp transfers one way and do the same on the other end.

In addition you could also try ttcp to achieve similar results, check out this link

http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a0080094694.shtml

HTH

Arvind

Purple

Re: Saturate a link.

Howdy,

A great way of doing this is to use a tool such as IPERF which is capable of generating UDP streams, so that you don't run into the problem on TCP back-off etc.

Hope that helps - pls rate the post if it does.

Paresh

Community Member

Re: Saturate a link.

i try the software TTCPW but, i have error.And my router can'nt run ttcp sender.

D:\SOFT\LINK BANDWITH TEST\TTCPW>ping renoir.csc.ncsu.edu

Envoi d'une requête 'ping' sur renoir.csc.ncsu.edu [152.14.53.12] avec 32 octets

de données :

Réponse de 152.14.53.12 : octets=32 temps=199 ms TTL=238

Réponse de 152.14.53.12 : octets=32 temps=251 ms TTL=238

Réponse de 152.14.53.12 : octets=32 temps=199 ms TTL=238

Réponse de 152.14.53.12 : octets=32 temps=200 ms TTL=238

Statistiques Ping pour 152.14.53.12:

Paquets : envoyés = 4, reçus = 4, perdus = 0 (perte 0%),

Durée approximative des boucles en millisecondes :

Minimum = 199ms, Maximum = 251ms, Moyenne = 212ms

D:\SOFT\LINK BANDWITH TEST\TTCPW>ttcpw -t -s renoir.csc.ncsu.edu

ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp -> renoir.csc.ncs

u.edu

ttcp-t: socket

ttcp-t: error=10061

D:\SOFT\LINK BANDWITH TEST\TTCPW>

Good day Howdy,

do you have a tool IPERF for udp data tranfer ??

Regards.

Purple

Re: Saturate a link.

You can get iperf for free from here:

http://dast.nlanr.net/Projects/Iperf/

Hope that helps - pls rate the post if it does.

Paresh

Community Member

Re: Saturate a link.

i 'll send you a feedback at the end.

Regards.

Purple

Re: Saturate a link.

No probs... just remember to use the '-u' option to get iperf to generate a UDP stream...

Paresh

Community Member

Re: Saturate a link.

There is a little Windows utility called QCheck, originally written by NetIQ. You can download it from :

http://www.ixiacom.com/products/qcheck/

It provides a nice simple bandwidth measurement between two machines (latency as well). From my experience it seems fairly accurate. We've used it on everything from 100Mbps switched connections to DSL VPN connections.

Dave

Community Member

Re: Saturate a link.

Thank, iperf is a good tools, i obtain 17.5Mbps on my p2p link.

I rate your post .

Thank you very much.

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