[Day 8] 4. IPTABLES and Chains

1. Checking Chains of Different Tables

In

iptables

| Command | Table Checked | | ------------------------------ | ----------------- | |

sudo iptables -L

sudo iptables -t nat -L

sudo iptables -t raw -L

sudo iptables -t mangle -L

sudo iptables -t security -L

Explanation:

• Copy

  -t

  option specifies the table.
• Copy

  -L

  option lists all the chains and rules within the specified table.

2. Default Table: Filter Table

If no table is explicitly mentioned, the default table used by

iptables

To check chains in the default (filter) table:

bashCopy
sudo iptables -L

Quick Summary

• Use
  Copy

  -t <table_name>

  to specify a table explicitly.
• Use
  Copy

  -L

  to list chains and rules within the table.
• If no table is mentioned, the filter table is used by default.