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Old 12-25-2005, 02:17 AM   #1
Registered: Aug 2005
Distribution: Debian, Ubuntu, Fedora
Posts: 74

Rep: Reputation: 15
does ifconfig rx bytes counter have Max limit


I have made a PHP script that runs periodically and get the value of RX bytes and TX bytes from the output of `ifconfig eht0` command, then it subtract the current RX or TX bytes value from the previous RX or TX value and divide it by the nomber of seconds betwen the tow samples to get (Bytes/Sec) ratio.

I am using it from inside cacti on a running server which have 4 to 6 GB transfer per day.

I have noticed that I have got a negative result of the ratio, yesterday the TX bytes output was something like 2 GB and today it is 3 MB !.

so the counter flip to zero and continue counting when it reaches an upper limit.

I need to know what Max limit it has? is it 2 to the power of 32 as it is a 32bit counter. I want the excact number so I can fix my script and get acurate values.

Old 12-26-2005, 04:03 PM   #2
Registered: Jan 2005
Location: Finland
Distribution: Ubuntu, Debian, Gentoo, Slackware
Posts: 827

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Ive seen values as high as 4G someties, but not much larger than that.. There is a limit, tho I dont know what it exactly is.. 2^32 would seem to be around that neighbourhood, so thats prolly it. (2^32 / 1024 / 1024 = 4096)
Old 12-26-2005, 05:07 PM   #3
Registered: Aug 2005
Distribution: Debian, Ubuntu, Fedora
Posts: 74

Original Poster
Rep: Reputation: 15
thanks , I have made the script to handle the value of 2^32-1 as the max limit.

it is working ok now.


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