ProxyARP Subnetting HOWTO Bob Edwards            Robert.Edwards@anu.edu.au          v2.0, 27 August 2025 This HOWTO discusses using Proxy Address Resolution Protocol (ARP) with subnetting in order to make a small network of machines visible on another Internet Protocol (IP) subnet (I call it sub-subnetting). This makes all the machines on the local network (network 0 from now on) appear as if they are connected to the main network (network 1). This is only relevent if all machines are connected by Ethernet or ether devices (ie. it won't work for SLIP/PPP/CSLIP etc.) Table of Contents 1. Acknowledgements 2. Why use Proxy ARP with subnetting? 3. How Proxy ARP with subnetting works 4. Setting up Proxy ARP with subnetting 5. Other alternatives to Proxy ARP with subnetting 6. Other Applications of Proxy ARP with subnetting 7. Copying conditions     Next     Acknowledgements