I need to set up a firewall using iptables to restrict users by MAC address. I have one ethernet card on my server that is the 'outgoing' line and another that is the 'incoming' traffic from the ...

When deciding on a firewall implementation, most Unix-savvy administrators have usually chosen to use ipfilter on OpenBSD for their combination of capabilities and stability, as the capabilities of ...

The Linux kernel includes some of the most powerful and flexible firewall code in any general-purpose operating system. This code is called Netfilter, though most of us refer to it by the name of its ...

Linux's iptables allows powerful firewalls to be implemented at a minute fraction of the cost of many commercial offerings. Basic iptables firewalls are packet filters, which means they inspect the ...

Iptables, more properly referred to as “iptables/netfilter” because of the two modules that are involved — the userspace module “iptables” and the kernel ...

Hi, I'm using Slackware 9 for a file server (SAMBA) and I need to lock down this PC. A lot of ports are open that I don't know how to close. Also, there is no firewall working.<BR><BR>The ports open ...

When I first started using Linux, back in '97, working with the built-in firewall was not something just anyone could do. In fact, it was quite complicated. Starting around 1998, if you want to manage ...

Mastering iptables could take a while, but if you have a few rules to cover the basic security needs, you’ll be well on your way to protecting your Linux system. Jack Wallen explains some key rules to ...

This chapter looks at the management of firewalls. From the perspective of the small office/home user, the firewall is a single device that protects the home network from malicious traffic—it keeps ...