5. What kernel configurations and iptables support are required to set up a Linux machine as a NAT router? Explain the role of network packet filtering, connection tracking, iptables support, full NAT, and MASQUERADE target support in this process.
To configure a Linux machine as a NAT router, ensure the following features are enabled in the kernel configuration:
1. Network packet filtering
2. Connection tracking
3. iptables support
4. Full NAT
5. MASQUERADE target support
Enabling these key features in the kernel empowers the Linux machine to serve as a NAT router, facilitating seamless communication between distinct subnets.
