sNAT

A Linux kernel module for Network Address Translation (NAT)

Features

• Supports Source NAT (SNAT) and Destination NAT (DNAT)
• Implements Port Address Translation (PAT)
• Handles TCP, UDP and ICMP packet translation

Building and Loading

Complie the module

make

Clean build

make clean

Load the module

sudo insmod NAT.ko

Unload the module

sudo rmmod NAT

View current settings

The module leverages procfs(Process Filesystem) to provide runtime configuration without reloading the kernel module

cat /proc/NAT/ip
cat /proc/NAT/timeout
cat /proc/NAT/start

Change settings

Set WAN IP

echo "xxx.xxx.x.xxx" | sudo tee /proc/NAT/ip

Adjust connection timeout

echo "120" | sudo tee /proc/NAT/timeout

Enable NAT

echo "1" | sudo tee /proc/NAT/start

Disable NAT

echo "0" | sudo tee /proc/NAT/start