Andrew Macpherson, Ltd

Maximising address space by shuning ones neighbours: today's SOHO ADSL customer typically buys a small block of 8 fixed IP Addresses which after deduction of two broadcast values, and a gateway address leaves 5 usable addresses for their equipment.

None of these three deducted addresses should be accessible from the Internet at large, unless the gateway address is used both on the LAN and WAN interface (unusual). Additionally hosting center customers will sometimes find themselves with blocks that cannot simply be joined by shifting their netmask by one bit, implying a duplication of the overhead.

This paper will explore ways of losing the overhead, and discuss the consequences.

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