We have a network with a number of remote sites all linked back to our HQ via site to site VPN's.
We wish to start monitoring the traffic is being used at each site with a view to a network upgrade. We are using netflow to assist.
We have configured several of the renote routers now (all Cisco 877's) and they appear to be sending netflow when the commands "show ip flow export" and "show ip cache flow" are used.
The problem is the netflow only sends to server there when a router is re-booted, i.e the 877 reports it is sending netflow constantly, but the server will only receive once - that is as soon as the router starts up?
This would suggest the network is OK to receive Netflow, it seems as though the 877 is just not sending.
Can anyone help ?