We currently have a dual-NIC Ubuntu server at our data centre acting as the gateway router between our public networks and our ISP. We have a /30 cross connect network on the ISP-facing NIC, and one IP from each of the three networks attached to our interior-facing NIC.
I would like to configure network traffic statistic generation and collection on this server, using Cisco's Netflow protocols. This will allow me to confirm our ISP's billing, as well as break-down data flow within our network.
What tools or packages would you recommend to passively capture traffic statistics and record them for later processing? Extra points if the Netflow collector has a MySQL data-store connector.