IPFWADM FAQ - Frequently asked questions

by DREAMWVR.COM [email protected]

This document is a list of Frequently Asked Questions (with the hopefully correct answers) about IPFWADM.

1. Meta-questions

2. IPFWADM Basics

3. Obtaining and installing ipfwadm

4. ipfwadm Usage

4.1 How do i see a detailed analysis of my rules for masquerading?
4.2 How do i check to see if a specific packet would be accepted, denied, or rejected by one of my specific firewalls?
4.3 What is the difference between rejecting and denying a packet in regards to the use of ipfwadm?
4.4 How do i enable ip forwarding from the command line?
4.5 How do i make IP forwarding automatically enabled upon bootup... whatever that is on Linux?
4.6 Where exactly do i place my ipfwadm rules that i wish to have run when i bring up my system so they run without intervention?
4.7 Why doesn't my browser's ftp work for me when i can access ok from other ftp clients and the command line just fine?
4.8 Can I use ipfwadm to protect services like ftp or POP?
4.9 Why is it important that i for me to start by denying access to literally all the firewalls that are controlled by ipfwadm?
4.10 Can you present a basic example for analysis?

5. Problems

6. Miscellaneous

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