I use iptables by many years and used it also for complex solutions and only recently i’ve discovered ufw (Uncomplicated Firewall), the ubuntu version, or better developed to ease iptables firewall configuration, ufw provides a user friendly way to create an IPv4 or IPv6 host-based firewall. By default UFW is disabled.
During my tests i installed a Debian 6 Squeeze on an Old laptop with an integrated ethernet card and a PCMCIA wireless card. Problem, after the install all works perfectly but the wireless, and installing new packages without a net is not so comfortable. You have to search on the net for the name of [...]
As comment of the article Knockd, to secure your ports, i’ve received: “Port knocking is bad idea; a very bad idea. Port knocking is, in the end, a password. A sniffable one that is subject to man-in-the-middle attacks so you can’t even use one-time-passwords and be secure. Public/private key pairs and/or one-time-passwords (opie, skey and [...]
On the web there are plenty of guides related to iptables, the firewall included in all the latest Linux distributions. iptables is a user space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall (implemented as different Netfilter modules) and the chains and rules it stores. Different [...]