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 ...

Version 2.6.12 of the Linux kernel is likely to include packet filtering that will work with IPv6, the latest version of the Internet Protocol. Netfilter/iptables, the firewall engine that is part of ...

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 ...

We conducted testing of only one URL per Web host based on our background knowledge, reinforced by subsequent testing, that when the default page of a site was filtered, the entirety of that site was ...

“[A] person of ordinary skill would have understood that in both the ‘713 patent and Sourcefire, the relevant data is located in the first packet of the message . . . [and] would have been ...

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 ...

Greetings all,<BR> I was wondering if anyone could help me find a basic packet filtering firewall script that didn't involve nat'ting? I'm still very confused by the iptables setup and have tried ...

Filters can permit or deny virtually any kind of traffic – up to a point. Here are some basic dos and don’ts for filter usage. Filters can permit or deny virtually any kind of traffic – up to a point.

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 ...