Yes, that's expected. ifInOctets / ifOutOctets are 32-bit counters; a link
running at 1Gbps (125,000,000 bytes per second) will wrap a 32-bit counter
every 34 seconds.
You need to query ifHCInOctets / ifHCOutOctets instead, which are 64-bit
counters.
Almost certainly those counters do exist on your device, if the "3rd party
monitoring tool" gives correct answers, and it is polling at the same
interval as your prometheus server.
On Thursday, 5 August 2021 at 22:07:40 UTC+1 Brian Lee wrote:
> Hi!
>
> I have several new devices that all share the same snmp_exporter problem:
> invalid metrics on high bandwidth network interfaces. They're all the same
> make/model (Checkpoint MHO170). And they all push 1-3Gbps on a daily basis,
> depending on the time of day. The network interfaces with the high
> bandwidth have wildly inaccurate metrics according to snmp_exporter. Any
> advice on how to troubleshoot this?
>
> For example, here's irate ifOutOctets *8 (preferring bits over bytes) on
> an interface over the last day:
>
> [image: snmp_exporter-eth2-09x.jpg]
>
> I happen to have access to a 3rd party monitoring tool, and here's the
> same interface over the same period (blue line is egress):
>
> [image: 3rd-party-eth2-09.jpg]
>
> $ curl <snmp_exporter> | grep eth2-09
> ifAdminStatus{ifDescr="eth2-09",ifName="eth2-09"} 1
> ifDescr{ifDescr="eth2-09",ifName="eth2-09"} 1
> ifInDiscards{ifDescr="eth2-09",ifName="eth2-09"} 36
> ifInErrors{ifDescr="eth2-09",ifName="eth2-09"} 0
> ifInNUcastPkts{ifDescr="eth2-09",ifName="eth2-09"} 0
> ifInOctets{ifDescr="eth2-09",ifName="eth2-09"} 1.535609325e+09
> ifInUcastPkts{ifDescr="eth2-09",ifName="eth2-09"} 2.6149782e+07
> ifInUnknownProtos{ifDescr="eth2-09",ifName="eth2-09"} 0
> ifIndex{ifDescr="eth2-09",ifName="eth2-09"} 103
> ifLastChange{ifDescr="eth2-09",ifName="eth2-09"} 0
> ifMtu{ifDescr="eth2-09",ifName="eth2-09"} 1500
> ifOperStatus{ifDescr="eth2-09",ifName="eth2-09"} 1
> ifOutDiscards{ifDescr="eth2-09",ifName="eth2-09"} 0
> ifOutErrors{ifDescr="eth2-09",ifName="eth2-09"} 0
> ifOutNUcastPkts{ifDescr="eth2-09",ifName="eth2-09"} 0
> ifOutOctets{ifDescr="eth2-09",ifName="eth2-09"} 1.738399962e+09
> ifOutQLen{ifDescr="eth2-09",ifName="eth2-09"} 0
> ifOutUcastPkts{ifDescr="eth2-09",ifName="eth2-09"} 3.217078663e+09
> ifPhysAddress{ifDescr="eth2-09",ifName="eth2-09",ifPhysAddress="00:1C:7F:<redacted>"}
>
> 1 ifSpecific{ifDescr="eth2-09",ifName="eth2-09",ifSpecific="0.0"} 1
> ifSpeed{ifDescr="eth2-09",ifName="eth2-09"} 4.294967295e+09
> ifType_info{ifDescr="eth2-09",ifName="eth2-09",ifType="ethernetCsmacd"} 1
>
>
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