How to configure nat forwarding using iptables

First, enable the kernel forwarding module. Echo1/porc/sys/net/ipv4/ip_forward # This is a temporary practice. it will expire after restart. a good practice is vi/etc/sysctl. modify the net. ipv4.ip _ forward1 and then to make it take effect immediately, run the command: sysctl-p. Step 2 add NAT: first enable the kernel forwarding module.

Echo 1>/porc/sys/net/ipv4/ip_forward # This is a temporary practice. it will expire after restart. the good practice is:
Vi/etc/sysctl. conf
Modify net. ipv4.ip _ forward = 1.
To make it take effect immediately, run the following command:
Sysctl-p
This is the first step.

Step 2 add NAT:
Iptables-T nat-a postrouting-s 192.168.10.0/24-o eth0-jMASQUERADE
# Eth0 in this command indicates the internet interface, and-s 192.168.10.0/24 indicates the intranet segment
Iptables has many parameters and settings.