Difference between revisions of "OPS535 Linux Firewall Review"

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* Text book: Chapter 13
 
= Concepts =
 
= Concepts =
 
* Netfilter
 
* Netfilter

Latest revision as of 11:52, 25 November 2019

  • Text book: Chapter 13

Concepts

  • Netfilter
  • iptables
  • firewall

Command line tools

  • iptables
  • ip6tables
  • arptables
  • ebtables
  • nft

iptables

  • raw table
    • PREROUTING chain
    • OUTPUT chain
  • managle table
    • PREROUTING
    • INPUT
    • FORWARD
    • OUTPUT
    • POSTROUTING
  • nat table
    • PREROUTING
    • INPUT
    • OUTPUT
    • POSTROUTING
  • filter table
    • INPUT
    • FORWARD
    • OUTPUT
  • security table
    • INPUT
    • FORWARD
    • OUTPUT

rules

iptables -t filter -A INPUT -p tcp --dport 22 -j ACCEPT
          |---------------| |---------------| |--------|
           where and when     match spec.       action