Linux Journal

Kernel Korner - The Hidden Treasures of iptables

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 ...
ZDNet

Netfilter and iptables: Stateful firewalling for Linux

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 ...
Network World

Working with iptables

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

Building a Transparent Firewall with Linux, Part IV

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 ...
Simon Fraser University

[linux-security] iptables security hole

Topic ===== security hole in iptables (2.4.x kernels) Problem Description ===== A vulnerability in iptables "RELATED" connection tracking has been discovered. When using iptables to allow FTP "RELATED ...