You can go several routes such as a Cisco ASA (very expensive and HUGE learning curve) or a higher end Zyxel router or you can use an old dedicated PC running a Linux firewall/router such as IPCop, pfsense or mOnOwall or any of dozens of free LINUX firewalls out there.
With the Linux option you are only limited by the dedicated PC you use for the router/firewall, the faster the CPU, the more DRAM etc. I have IPCop (
in an older Dell P3 600 with a GIG of DRAM and 4 NICs (1 for the WAN, 1 for DMZ 1 for LAN and 1 for Wireless LAN) and it handles traffic like a champ. I am not doing a lot with QoS but most of these will let you control or monitor just about any aspect of the network through your browser interface.
I know I can do this with linux
I did this many times few years ago
But problem is this is for small companys and computer specially old one takes to much space
Low cost - then you might want to look at one of the older Linksys routers with the "after market" firmware on it like "Tomato" - I think some of these Linux firmwares that have been developed for these Linksys routers do VLANs, DMZs QoS etc. but of course they are not supported by Linksys.
More expensive - check out Zyxel routers or a Cisco PIX 506.
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