Help with updating SNMP counters

[targa]

Im pulling SNMP stats from a router.

InBytes gives total count in
OutBytes gives total count out

I refresh the page every 5 seconds to update the counters.

I need to do ifVolumeBytes which would be InOctets + OutOctets passed only within each 5 second interval.

Not sure how to accomplish this. I think I need to grab the value of In & Out first, then after 5 seconds grab the new values of In & Out, subtract the first values from the second values to get the Octets passed within each 5 second interval and then add the two results to get the total curent volume.

So how can I do this? Im at a loss.

I will eventually be passing these values to a graph which will update with each refresh - but thats for another day :-)

Thanks!

[amansabharwal]

try using files/database.
when you first get the inbytes and outbyte information store this information in file or database along with the time at which you got the information. this way you will be able to pass the information to form also.

aman