Network throughput

Dan Nelson dnelson at
Wed Jan 11 19:32:17 UTC 2012

In the last episode (Jan 11), Ott Köstner said:
> On 11.01.2012 16:57, Matthew Seaman wrote:
> > Yes -- mrtg is nice, but it relies on the snmp interface counters, and
> > in this case with Gb traffic levels a 32bit counter will wrap in a few
> > minutes.  mrtg samples the interface counter every 5 minutes IIRC, so
> > would probably be confused by that wrap-around happening at around the
> > same frequency.  Unless you switch to using 64bit interface counters,
> > but I don't know if mrtg can cope with integer types that wide... 
> > Cheers, Matthew
> Yes, I have seen that wrapping with few hundred megabit port traffic.  New
> snmp port has 64 bit counter option.  Personally, I have already built a
> new snmp with 64 bit counter option, but not yet tested if it works. 
> Maybe somebody here can comment?

Definitely works.  You will have to tell mrtg to make SNMPv2 requests for
the 64-bit OIDs to appear, but that's it.

	Dan Nelson
	dnelson at

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