NetFlow collectors eat RAM and disk I/O. Do not install these on an old Raspberry Pi (unless you are using very lightweight softflowd ). A $5/month VPS or an old desktop with an SSD is the perfect home. Assuming you have a Cisco router or a switch (like UniFi, MikroTik, or pfSense), here is the generic export command:
Have a favorite free NetFlow tool I missed? Let me know in the comments below! netflow monitoring free
Enter .
If you manage a network, you know the feeling. Bandwidth is crawling, someone is streaming 4K video, or worse—you suspect a security breach. You need answers, not just gut feelings. NetFlow collectors eat RAM and disk I/O