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IP tables

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Short presentation on IP tables (5-6 min)

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I Pt abl e s By T homas Aamodt
Goals of Presentation • History about the linux firewall • Introduction of iptables • Stateful inspection • Address translation • Packet mangling • Logging • Protection
History • Ipfirewall (Ipfw) 1994 • Made by Alan Cox • Ipchains/Iptables 1998/1999 • Made by Rusty Russell
Introduction of iptables • Netfilter Module • Kernel based • Examines packets • Run on low Computer power • Built-in iptables Chains: INPUT,OUTPUT and FORWARD
Stateful Inspection • Increased network security • Checks header infromation • Iptables options: NEW,RELATED,INVALID,ESTABLISHED
Address Translation • Network Address Translation (NAT) • Transforms IP addresses • Most common use is Masquerading • Iptables options: DNAT,SNAT,REDIRECT
Packet Mangling • Change/modify packets • Example prioritize traffic with TOS • TOS options • Iptables options: PREROUTING,POSTROUTING
Logging • Log prefix notes • Iptables options: LOG
Basic commands and tricks • Variables • Module Loading • Enable IP forwarding • Flush rules • Flush nat tables • Flush Chains • Diffrent JUMPS (targets) • Policyes
Basic commands and tricks • Create new chains • Rules • Make bash scripts to simplify your job!
Protection • Protection agains IP Spoofing • Make sure all NEW tcp packets are SYN • SYN flood protection / DOS protection
Summery • First Delevloped for linux by Alan Cox • IPtables Delevloped by Rust Russell • States to run your iptables firewall on • Commands and Tricks • Protection

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IP tables

  • 1. I Pt abl e s By T homas Aamodt
  • 2. Goals of Presentation • History about the linux firewall • Introduction of iptables • Stateful inspection • Address translation • Packet mangling • Logging • Protection
  • 3. History • Ipfirewall (Ipfw) 1994 • Made by Alan Cox • Ipchains/Iptables 1998/1999 • Made by Rusty Russell
  • 4. Introduction of iptables • Netfilter Module • Kernel based • Examines packets • Run on low Computer power • Built-in iptables Chains: INPUT,OUTPUT and FORWARD
  • 5. Stateful Inspection • Increased network security • Checks header infromation • Iptables options: NEW,RELATED,INVALID,ESTABLISHED
  • 6. Address Translation • Network Address Translation (NAT) • Transforms IP addresses • Most common use is Masquerading • Iptables options: DNAT,SNAT,REDIRECT
  • 7. Packet Mangling • Change/modify packets • Example prioritize traffic with TOS • TOS options • Iptables options: PREROUTING,POSTROUTING
  • 8. Logging • Log prefix notes • Iptables options: LOG
  • 9. Basic commands and tricks • Variables • Module Loading • Enable IP forwarding • Flush rules • Flush nat tables • Flush Chains • Diffrent JUMPS (targets) • Policyes
  • 10. Basic commands and tricks • Create new chains • Rules • Make bash scripts to simplify your job!
  • 11. Protection • Protection agains IP Spoofing • Make sure all NEW tcp packets are SYN • SYN flood protection / DOS protection
  • 12. Summery • First Delevloped for linux by Alan Cox • IPtables Delevloped by Rust Russell • States to run your iptables firewall on • Commands and Tricks • Protection