Security Management in Linux

Firewall

Define rules for network traffic

Traffic can be incoming or outgoing

:::info Should not block ident protocol running on port 113

This sends packets to verify our Identity :::

Functions:

Analyzes packets incoming or outgoing

Allow traffic

Deny traffic

Forward traffic

Looking for open ports

sudo ss -4nap

sudo ss -6nap

:::info LISTEN → waiting for incoming connections

ESTAB → connected and it is outgoing connections :::