[mrtg] Re: Gigabit speed, net-snmp, and overflows
dkeenan at ist.uwaterloo.ca
Fri Feb 10 16:17:39 MET 2006
John Haggerty wrote:
> I'm trying to track Gigabit traffic on Red Hat 3 Update 5 servers with
> net-snmp (rpm net-snmp-5.0.9-2.30E.15) with mrtg (rpm
> mrtg-2.10.15-1.i386), but even though I've reduced the polling time to 1
> minute, at the highest speeds, the results are inaccurate, I suppose
> because the 32 bit counters overflow in around 30 seconds.
> I cannot see how to configure net-snmp to serve up the 64 bit high speed
> counters; for example, cfgmaker says
You probably need a more recent version of Net-SNMP built with
"--enable-mfd-rewrites" to get the IfXTable 64 bit counters for interfaces.
From http://www.net-snmp.org/about/ChangeLog.html (for Net-SNMP 5.2):
- new experimental tables/rewrites for Linux, including:
ifTable, ifXTable, inetCidrRouteTable, ipCidrRouteTable,
ipAddressTable, ipSystemStatsTable, ipNetToPhysicalTable.
- Enable these talbles by specifying --enable-mfd-rewrites to configure.
- Most of these tables have IPv6 support as well.
- ifIndex no longer changes when interfaces are added/removed, and all
tables/object wiil now use the same ifIndex for the same interface.
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