I posted a topic about my firewall script a few days ago and got a ton of help. Instead of reviving that topic, I decided to start a new one. <BR><BR>I'm trying to learn iptables firewalling and I ...

I have a debian box at IP "11.22.33.44" which is running an vmware turnkeylinux appliace/app. Its running on a host only private network, connected (virtually) to only the host box on a virtual ...

Dear readers, I appear to have set a Paranoid Penguin record—six months spent on one article series. (It has consisted of five installments, with a one-month break between the second and third pieces.

Before we can start writing our own firewall rules, we need to have some understanding of how iptables actually works. It all starts with tables, which many of you have already guessed by the name.

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

It’s a sad fact that the majority of malicious web traffic to US sites originates from the same handful of foreign countries. If your site doesn’t benefit from actual users living in those countries, ...

/sbin/iptables -A FORWARD -p all -s 172.16.1.105 -j DROP /sbin/iptables -A FORWARD -p all -s 172.16.1.25 -j DROP /sbin/iptables -A FORWARD -p all -s 172.16.1.78 -j ...

I've been writing a multipart series on building a transparent (bridging) firewall using Linux. Specifically, I'm using the distribution OpenWrt running on a Linksys WRT54GL broadband router, a ...

While there are a lot of ways to achieve this, I prefer using the 'post-up' method. To be able to use this method, we first need to make the script executable. This is done by chmoding it to '700', so ...