Ubuntu Linux Gateway Example

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The following are the steps necessary to create a general purpose gateway to AMPRNet using an Ubuntu Linux Server.

Design

The basic design consists of a standard PC running Ubuntu 12.04 (LTS) and three network connections:

  1. The first connection is to your ISP so you can reach the Internet.
  2. The second connection is used to connect your normal "non-ham" devices to the Internet.
  3. The third connection is used to connect your "ham" devices so they can see and be seen by other AMPRNet devices.

The following diagram shows the layout of the connections. (Click on the image to enlarge).

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Prerequisites

Hardware

Software

IP Addresses

About IPv4 Addresses

Static IPv4 from your ISP

Private IPv4 Addresses for "Non-Ham" Devices

AMPRNet IPv4 Address Allocation

Installing Required Software

Setting up the ISP (Internet) Interface

Configuring the interface

Testing

Setting up the "Non-Ham" Network Interface

Configuring the Interface

Setting up Routing (Part 1)

Setting up DNS

Setting up DHCP

Testing

Setting up the Firewall (Part 1)

Setting up NAT

Protecting the Gateway

Protecting the "Non-Ham" Network

Saving the firewall rules

Setting up the Local "Ham" Network (AMPRNet) Interface

Configuring the Interface

More DHCP

Setting up the Tunnel to AMPRNet

Setting up Routing (Part 2)

Setting up Policy Based Routing

Automating Routing Updates with rip44d

Getting rip44d

Compiling and installing rip44d

Running rip44d

Setting up the Firewall (Part 2)

Projecting the Local "Ham" Network

Testing

Saving your work

Next Steps