Quote: Originally Posted by kem
One reason I bought a router was so that it provided firewall protection therefore no need for a software firewall.
You still need a software firewall - both compliment each other.
A hardware firewall (router) is the first line of defense, but if it is breached and you do not use a software firewall, there is no second layer of defense to protect the PC's sitting behind the hardware firewall. Hardware firewalls tend to be less sensitive to traffic leaving your PC on its way out to the interent : quite a problem if you unknowingly have a malicious bit of software sending every keystroke you type back to some hacker. A hardware-based firewall will not recognise this activity as malicious, and will not block it.
A software firewall on the other hand plays the role of the secondary defense. It specialises in filtering all the outbound traffic from your PC to the internet, and has the ability to determine what is malicious traffic or not, based on several rules (which is why it is so important to keep your firewall software updated).
In a nutshell :
Hardware firewalls inspect and intercept inbound traffic
from the internet to your PC
Software firewall inspect and intercept outbound traffic
from your PC to the internet
I strongly recommend you install a software-based firewall.