From DD-WRT Wiki

Introduction

SSH tunneling allows you to forward traffic from one location to another using encryption between them. It is great for accessing your home network from remote locations such as your workplace or public WIFI hotspots. Not only can you use it to access your home network securely, but you can also use it to securely browse the internet by forwarding your traffic from the remote location to your home and then out to the internet unencrypted from your home. This can allow you to bypass security restrictions as well.

Requirements

• You will need a firmware version that supports SSH for your home router.
• You will need a SSH client running at the remote location.

Configuring the DD-WRT SSH Server

Configuring the Remote SSH Client

PuTTY Client

Command Line Client

References