Proxy-ARP-Subnet - ProxyARP Subnetting HOWTO Bob Edwards

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ProxyARP Subnetting HOWTO Bob Edwards Robert.Edwards@anu.edu.au v2.0, 27 August 2000 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.)
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Table of Contents 1. Acknowledgements. ........................................................................................................................................ 1 2. Why use Proxy ARP with subnetting?. ......................................................................................................... 2 3. How Proxy ARP with subnetting works. ...................................................................................................... 3 4. Setting up Proxy ARP with subnetting. ........................................................................................................ 5 5. Other alternatives to Proxy ARP with subnetting. ...................................................................................... 7 6. Other Applications of Proxy ARP with subnetting. .................................................................................... 8 7. Copying conditions. ......................................................................................................................................... 9 ProxyARP Subnetting HOWTO i
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1. Acknowledgements This document, and my Proxy ARP implementation could not have been made possible without the help of: Andrew Tridgell, who implemented the subnetting options for arp in Linux, and who personally assisted me in getting it working the Proxy-ARP mini-HOWTO, by Al Longyear the Multiple-Ethernet mini-HOWTO, by Don Becker the arp (8) source code and man page by Fred N. van Kempen and Bernd Eckenfels 1. Acknowledgements 1
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2. Why use Proxy ARP with subnetting? The applications for using Proxy ARP with subnetting are fairly specific. In my case, I had a wireless Ethernet card that plugs into an 8-bit ISA slot. I wanted to use this card to provide connectivity for a number of machines at once. Being an ISA card, I could use it on a Linux machine, after I had written an appropriate device driver for it - this is the subject of another document. From here, it was only necessary to add a second Ethernet interface to the Linux machine and then use some mechanism to join the two networks together. For the purposes of discussion, let network 0 be the local Ethernet connected to the Linux box via an NE-2000 clone Ethernet interface on eth0. Network 1 is the main network connected via the wireless Ethernet card on eth1. Machine A is the Linux box with both interfaces. Machine B is any TCP/IP machine on network 0 and machine C is likewise on network 1.
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This note was uploaded on 03/12/2012 for the course PHYSICS 105 taught by Professor Dr.bekub during the Fall '08 term at Dhaka College.

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Proxy-ARP-Subnet - ProxyARP Subnetting HOWTO Bob Edwards

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