This chapter has gone through several of the basic IP filtering and security measures that you can take to secure your networks, workstations and servers. The following subjects have been brought up:
IP filtering usage
IP filtering policies
Layered security techniques
In the next chapter we will take a quick look at what Network Address Translation (NAT) is, and after that we will start looking closer at Iptables and it's functionality and actually start getting hands on with the beast.