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Dedications
About the author
How to read
Prerequisites
Conventions used in this document
Chapter 1. Introduction
Why this document was written
How it was written
Terms used in this document
What's next?
Chapter 2. TCP/IP repetition
TCP/IP Layers
IP characteristics
TCP characteristics
TCP headers
UDP characteristics
UDP headers
ICMP headers
SCTP Characteristics
SCTP Headers
TCP/IP destination driven routing
What's next?
Chapter 3. IP filtering introduction
What is an IP filter
IP filtering terms and expressions
How to plan an IP filter
What's next?
Chapter 4. Network Address Translation Introduction
What NAT is used for and basic terms and expressions
Caveats using NAT
Example NAT machine in theory
What's next?
Chapter 5. Preparations
Where to get iptables
Kernel setup
User-land setup
What's next?
Chapter 6. Traversing of tables and chains
General
Mangle table
Nat table
Raw table
Filter table
User specified chains
What's next?
Chapter 7. The state machine
Introduction
The conntrack entries
User-land states
TCP connections
UDP connections
ICMP connections
Default connections
Untracked connections and the raw table
Complex protocols and connection tracking
What's next?
Chapter 8. Saving and restoring large rule-sets
Speed considerations
Drawbacks with restore
iptables-save
iptables-restore
What's next?
Chapter 9. How a rule is built
Basics of the iptables command
Tables
Commands
What's next?
Chapter 10. Iptables matches
Generic matches
Implicit matches
Explicit matches
What's next?
Chapter 11. Iptables targets and jumps
ACCEPT target
CLASSIFY target
CLUSTERIP target
CONNMARK target
CONNSECMARK target
DNAT target
DROP target
DSCP target
ECN target
LOG target options
MARK target
MASQUERADE target
MIRROR target
NETMAP target
NFQUEUE target
NOTRACK target
QUEUE target
REDIRECT target
REJECT target
RETURN target
SAME target
SECMARK target
SNAT target
TCPMSS target
TOS target
TTL target
ULOG target
What's next?
Chapter 12. Debugging your scripts
Debugging, a necessity
Bash debugging tips
System tools used for debugging
Iptables debugging
Other debugging tools
What's next?
Chapter 13. rc.firewall file
example rc.firewall
explanation of rc.firewall
What's next?
Chapter 14. Example scripts
rc.firewall.txt script structure
rc.firewall.txt
rc.DMZ.firewall.txt
rc.DHCP.firewall.txt
rc.UTIN.firewall.txt
rc.test-iptables.txt
rc.flush-iptables.txt
Limit-match.txt
Pid-owner.txt
Recent-match.txt
Sid-owner.txt
Ttl-inc.txt
Iptables-save ruleset
What's next?
Chapter 15. Graphical User Interfaces for Iptables/netfilter
fwbuilder
Turtle Firewall Project
Integrated Secure Communications System
IPMenu
Easy Firewall Generator
What's next?
Chapter 16. Commercial products based on Linux, iptables and netfilter
Ingate Firewall 1200
What's next?
Appendix A. Detailed explanations of special commands
Updating and flushing your tables
Appendix B. Common problems and questions
Problems loading modules
State NEW packets but no SYN bit set
SYN/ACK and NEW packets
Letting DHCP requests through iptables
Appendix D. TCP options
Appendix F. Acknowledgments
Appendix G. History
Appendix H. GNU Free Documentation License
0. PREAMBLE
1. APPLICABILITY AND DEFINITIONS
2. VERBATIM COPYING
3. COPYING IN QUANTITY
4. MODIFICATIONS
5. COMBINING DOCUMENTS
6. COLLECTIONS OF DOCUMENTS
7. AGGREGATION WITH INDEPENDENT WORKS
8. TRANSLATION
9. TERMINATION
10. FUTURE REVISIONS OF THIS LICENSE
How to use this License for your documents
Appendix I. GNU General Public License
0. Preamble
1. TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
2. How to Apply These Terms to Your New Programs
Appendix J. Example scripts code-base
Example rc.firewall script
Example rc.DMZ.firewall script
Example rc.UTIN.firewall script
Example rc.DHCP.firewall script
Example rc.flush-iptables script
Example rc.test-iptables script
Index
Symbols
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