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You could use Untangle, PFSense, M0n0wall... Or use any Hardware Juniper, Cisco Firewall, that can do traffic shaping, monitoring - snmp and so on.
But those are the three OS answers that I know of.
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I can either spent more to buy hardware from cisco, juniper, fortinet. But seems they filter only up to network level(layer 3) but not host (application) level?
Please let me know if the hardware firewalls are really better than tailor linux box.