10-03-2012 09:15 PM - edited 03-04-2019 05:45 PM
Hi All,
How can i check the BW of a link that is newly comissioned from service provider.
Suppose i have upgraded bandwidth to 5 MB from a service provider and i want to check it using extended ping command from my router to PE end router.
What is the exact calculation (in terms of size ).....how much will be 5 MB can u please explain that calculation.
Best Regards
MJ
Solved! Go to Solution.
10-06-2012 05:54 AM
Hello Mukul.
you need to do a single test first to evaluate the round trip time. RTT
Roughly the bit rate of a single ping will be given by:
PING-Size * 8 bits/byte / RTT
So if you send 1000 ping of size 5000 bytes and you get an average RTT of 100 msec you can say that it counts like
5000*8 /0.1 = 400000 bps
And in this case to reach 5000000 bps you need 12 parallel sessions of extended pings with size 5000 bytes
Hope to help
Giuseppe
10-06-2012 06:23 AM
about "so 5 MB is 5242880 bytes here right"
Note:
When used to describe Data Transfer Rate, bits/bytes are calculated as in the metric system
For example, 28.8 kilobits per second (kbps) is 28,800 bits per second
http://www.speedguide.net/articles/bits-bytes-and-bandwidth-reference-guide-115
The throughput of communications links is measured in bits per second (bit/s), kilobits per second (kbit/s), megabits per second (Mbit/s) and gigabits per second (Gbit/s). In this application, kilo, mega and giga are the standard S.I. prefixes indicating multiplication by 1,000 (kilo), 1,000,000 (mega), and 1,000,000,000 (giga).
10-04-2012 03:04 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Would be a "difficult" to verify 5 Mbps using pings.
What I do is use a non-TCP traffic generator. Push, say, 6 Mbps toward the other side of the link. See if 5 Mbps comes out.
Note - such testing can be adverse to other traffic unless you're using QoS and you can have the test traffic use only available bandwidth. Good time to test is during a maintenance window.
10-04-2012 12:48 PM
Hi Mukul,
Do you want to check, How much bandwidth is coming while ur provider promise for 5mb ?
Is it ??
If yes then:
Open this: http://www.speedtest.net/
Click on Begin test, it will show the DW and UP speed.
Run several speed tests, and evaluate the results. It is always a good idea to run at least three speed tests to cover any minor variations that may occur between tests. Take the average of all the tests, and compare it to the speeds that are guaranteed by your ISP to evaluate your test results.
Regards
10-04-2012 01:11 PM
Hi Mukul,
you can use Iperf, this is really easy . just with one command it will tell you network bandwidth.
http://www.techrepublic.com/blog/networking/use-iperf-for-quick-and-easy-network-tests/725
http://duntuk.com/how-use-install-and-use-iperf
hope this will help.
please rate if this helps.
thanks
10-06-2012 04:21 AM
Hi All,
I am accessing this router remotely. I have to check the BW say a pipe of 5MB is given by SP which terminates at router gig interface.I can't take session of hosts devices to check this traffic otherwise it would be an easy task.
What i can do is send ping packets with some load and then can check this load in router's gig interface using command :-
sh int gig 0/0.
My question is how to calculate the size of those pings ? suppose i send a ping
ping
Here i want to know what does size represent >> what is 1500 is it byte or bit or Kilobit or KB(byte)
Please advise
Best Regards
MJ
10-06-2012 04:48 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
My question is how to calculate the size of those pings ? suppose i send a ping Here i want to know what does size represent >> what is 1500 is it byte or bit or Kilobit or KB(byte)
It's in bytes.
However, I don't recall when the size includes header's size.
Depending how exact you're trying to be, there's also framing overhead too.
Also unsure whether a Cisco ping sends every consecutive ping request physically back-to-back or whether there's a slight timing gap between requests.
10-06-2012 05:07 AM
Hi Joseph,
I have to open 4 to 6 remote sessions of this router and will try continous pings say about 5000 packets.
so 5 MB is 5242880 bytes here right !!
how much size should i place i think 5000 will work ? i m not sure ....i m totally confused in this calculation?
Regards
MJ
10-06-2012 05:54 AM
Hello Mukul.
you need to do a single test first to evaluate the round trip time. RTT
Roughly the bit rate of a single ping will be given by:
PING-Size * 8 bits/byte / RTT
So if you send 1000 ping of size 5000 bytes and you get an average RTT of 100 msec you can say that it counts like
5000*8 /0.1 = 400000 bps
And in this case to reach 5000000 bps you need 12 parallel sessions of extended pings with size 5000 bytes
Hope to help
Giuseppe
10-06-2012 07:23 AM
Hi Giuseppe,
Thanks for the help.Now i got this concept.1 more question what is the max size that i can use in extended ping so as to reduce the no of session ...Is there any limit defined ?
Regards
MJ
10-06-2012 06:23 AM
about "so 5 MB is 5242880 bytes here right"
Note:
When used to describe Data Transfer Rate, bits/bytes are calculated as in the metric system
For example, 28.8 kilobits per second (kbps) is 28,800 bits per second
http://www.speedguide.net/articles/bits-bytes-and-bandwidth-reference-guide-115
The throughput of communications links is measured in bits per second (bit/s), kilobits per second (kbit/s), megabits per second (Mbit/s) and gigabits per second (Gbit/s). In this application, kilo, mega and giga are the standard S.I. prefixes indicating multiplication by 1,000 (kilo), 1,000,000 (mega), and 1,000,000,000 (giga).
10-06-2012 07:25 AM
Hi Roberto,
Thanks Roberto.....Years old confusion is now clear .
Thanks for help.
10-07-2012 10:51 PM
Hi Mukul,
Here you are talking about 5 mbps line, can i know that existing line
is using for Internet access OR point to point connectivity ?
Secondly, what is PE Router ?
Thirdly, How to check bandwidth through Ping Load,
Plz explain with simple ping example with command
10-09-2012 08:41 AM
Hi Kuldeep,
It's a MPLS link to service provider.
PE ie provider edge router.
ping
10-09-2012 09:07 AM
Thanks Mukul for reply me
10-09-2012 08:41 AM
Hi Giuseppe,
Thanks for the help.Now i got this concept.1 more question what is the max size that i can use in extended ping so as to reduce the no of session ...Is there any limit defined ?
Regards
MJ
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