Network geeks among you may remember my article, “Linux Socket Filter: Sniffing Bytes over the Network”, in the June 2001 issue of LJ, regarding the use of the packet filter built inside the 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 ...

Learn how firewalls have progressed from simple packet filtering to more sophisticated application-level filtering. Webopedia.com defines a firewall as “a system designed to prevent unauthorized ...

If it's true that external packet must first traverse my filtering rules, what interface will the packet arrive to my WinXP box from? By virtue of being redirected to an internal address does PF ...

Countless pieces of software, protocols and complex interdependencies together form a system for which it is difficult to guarantee any particular property—particularly security. Even software ...