Difference between revisions of "OPS535 Linux Firewall Review"

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[[Category:OPS535]]
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* Text book: Chapter 13
 
= Concepts =
 
= Concepts =
* Netfilter
+
* Netfilter/iptables with iptables(legacy)
* iptables
+
* Netfilter/nftables with iptables(nt_tables)
* firewall
+
* firewall with firewalld (front end for netfilter/iptables and netfilter/nftables)
 +
 
 
= Command line tools =
 
= Command line tools =
 
* iptables
 
* iptables
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* ebtables
 
* ebtables
 
* nft
 
* nft
 +
* firewall-cmd
 +
 
= iptables =
 
= iptables =
 
* raw table
 
* raw table
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**FORWARD
 
**FORWARD
 
**OUTPUT
 
**OUTPUT
= rules =
+
== rules ==
 
<pre>
 
<pre>
 
iptables -t filter -A INPUT -p tcp --dport 22 -j ACCEPT
 
iptables -t filter -A INPUT -p tcp --dport 22 -j ACCEPT
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           where and when    match spec.      action
 
           where and when    match spec.      action
 
</pre>
 
</pre>
 +
= nft =
 +
* table ip filter
 +
* table ip security
 +
* table ip raw
 +
* table ip mangle
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* table ip nat
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* table inet firewalld
 +
* tables ip firewalld
 +
 +
= man pages =
 +
* man iptables
 +
* man nft
 +
* man firewall-cmd

Latest revision as of 02:25, 17 January 2021

  • Text book: Chapter 13

Concepts

  • Netfilter/iptables with iptables(legacy)
  • Netfilter/nftables with iptables(nt_tables)
  • firewall with firewalld (front end for netfilter/iptables and netfilter/nftables)

Command line tools

  • iptables
  • ip6tables
  • arptables
  • ebtables
  • nft
  • firewall-cmd

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

nft

  • table ip filter
  • table ip security
  • table ip raw
  • table ip mangle
  • table ip nat
  • table inet firewalld
  • tables ip firewalld

man pages

  • man iptables
  • man nft
  • man firewall-cmd