How to calculate the amount of transmission data per second

[Joseph Lee_5]

Could you tell me some ABC?

MTU size = 1500

netstat -I lan1 1
(lan1)->input output
packets packets
1889785720 1150376362
1889788666 1150378958

amount of transmission data per second in lan1 =
((1889788666-1889785720)+(1150378958-1150376362))*1500 = 8313000 byte

Could you tell me my arithmetic is right or wrong?

TIA
Joseph

[Bharat Katkar · Accepted solution]

That output indicates Traffice on that particular interface and not the Speed.
Both things are different.

What we use to do is calculate the performance or speed of our network by ftp of any big files and it give you back the speed with which it was transffered.

Do it on Peak period, normal load and no load situations.



Hope this helps,

Regards

[Ralph Grothe]

I think to get a clear picture you also need to record the sizes of the counted packets.
In your calculation you multiply the in and outbound packets' differences per interval with the maximum transfer unit of the NIC,
assuming all counted packets being this size.
I don't believe this is necessarily the case.
I'm sure the gurus will provide you a correct eplanation.
Maybe you could query the MIB stats through SNMP GET calls or do some packet sniffing to get a more detailed picture?

[Joseph Lee_5]

I want to take a report to my boss about network interface flux, but I have not any tools. How should I calculate it?

Thank you very much.

[Ralph Grothe]

Joseph,

you may find a nice tool for benchmarking your NICs here:

http://www.netperf.org/netperf/NetperfPage.html