This assignment provides a comprehensive Linux firewall script written in bash using iptables. The script configures various aspects of network security, including setting up interfaces (INET_IF and LAN_IF), defining IP addresses and networks, and specifying port ranges for different services. It includes rules for the INPUT, FORWARD, and OUTPUT chains, managing traffic flow and applying security measures. The script addresses several key security concerns by dropping NetBIOS traffic, implementing ICMP handling, and allowing only specific SSH access. It also incorporates rules for DHCP, VoIP, and Bittorrent, along with IPv6 endpoint configuration. Furthermore, the script utilizes Network Address Translation (NAT) for port forwarding and applies Quality of Service (QoS) settings via DSCP for VoIP traffic. The script ensures that established and related connections are accepted while logging and dropping other traffic. Finally, the script stops and starts the network interface to apply the firewall rules effectively.
![[object Object]](/_next/static/media/star-bottom.7253800d.svg)
