Computer Security & Viruses/re : firewall

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Question
Do you know what typical process should be running with respect to firewall?

Answer
There isn't just one. How many there are and what they do depend on the firewall.  Anything that runs the Linux kernel (SoHo routers, for example) runs one or more programs that are part of NetFilter suite .   Wikipedia's explanation of it isn't terrific but here it is: Netfilter on Wikipedia.  

If you can find a tutorial from Rusty Russel or Oskar Andreassson you'll learn about it from the "horse's mouth".   Rusty Russel wrote it; Oskar Andreassson wrote about it (for years).

Oskar Andreasson

This answers your question.  I'll happily answer the question no matter how you ask it.

Note that Windows Firewall is a completely different animal and doesn't really fit the definition of "firewall".

My two cents.

Computer Security & Viruses

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John Crout

Expertise

Linux, Windows, Open/Free BSD, OSX. Embedded MMU-less (firmware) devt.

Experience

Securing systems since 1982. Tip: Switching from a system that is (statistically) more prevalent to one that is less prevalent will help.

Organizations
Information Systems Security Association (ISSA) United States Coast Guard Auxiliary (USCG Auxiliary), ACM

Publications
Student Doctor Magazine EE Times Network World blog Navy CIO blog RTCA/DO-178B, "Software Considerations in Airborne Systems and Equipment Certification", (member of SC-167), RTCA/DO-160C, "Environmental Conditions and Test Procedures for Airborne Equipment", (member of SC-135)

Education/Credentials
Master of Public Health (Epidemiology and Biostatistics) Bachelor of Science in Electrical Engineering (Computer Engineering Option) Digital Forensics Basics, Texas Engineering Extension Secure Software, Texas Engineering Extension Network Security, Texas Engineering Extension Infosec Basics, Texas Engineering Extension Information Assurance Awareness, Department of Defense Information Systems Security, United States Coast Guard Online safety for parents and children, Fort Collins Police Department Spear Phishing, Defense Information Security Agency, DISA Spear Phishing, United States Coast Guard, USCG Meeting the Media, Testifying, Presentations, Arch Lustberg FEMA (ICS-100, -200, -210, -700, 800) United States Coast Guard Defense Information Systems Agency United States Coast Guard Auxiliary Crosby Quality Workgroup Facilitator Trainer Crosby Quality Education System Wisconsin University

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