In the last issue we started following a packet's journey from the wire up to the higher levels of network stack processing. We left the packet at the end of layer 3 processing, where IP has ...

So unlike static packet filtering (an earlier technology) which examined packets based on the information in their header, stateful inspection can actually track each connection across all interfaces ...

I am currently running a USB ADSL (static IP I beleive - 62.xx.xx.xx) service to other PCs on the network via Winroute Pro running on windows 2K advanced server. (ADSL to Server to Switch to 3 PCs - ...

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 ...

“[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 ...

Many of us don’t give much thought to just what is traversing the corporate network. That is largely a job for the company’s system administrator. The thing of it is, though, the sysadmin quite often ...

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 ...