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#11
If you have got problems, you probably have a bad router. Hardware + software firewall is the best combo.
But lets not forget, that there are basically 2 kinds of routers: NAT routers and routers with SPI Firewall.
NAT will stop unsolicited traffic/background noise, which causes a higher network adapter's usage.
SPI Firewall works the same way like a software firewall, it can not be disabled and does not stress CPU.
Of course, each router has a different SPI, some are basic, some more advanced, but even basic are great.
NAT/SPI explained: http://securityspread.com/2013/07/26/firewall/