I have Netflow enabled on an interface like so:
Interface f0/0/1 ip flow ingress ip flow egress
Then I have two separate sensors on PRTG filtering Netflow data going in and out of the interface using this filter for the inbound traffic: InboundInterface
And for the outbound traffic: OutboundInterface
I'm also monitoring the same interface using SNMP, which gives me the standard three channels: Traffic Total, Traffic IN, Traffic OUT.
The problem is, when I compare my SNMP data to my netflow data for the outbound or inbound traffic, they don't match up!
Netflow shows more total traffic than SNMP.
Why could this be?