User Manual

Version 3.03 SPEEDLAN 9000 Series Installation and Operation User Guide
9-6 Basics of IP Addressing
If Router D is reading IP Addresses 192.0.2.1 (let's call this IP Address 1) and
192.0.2.64 (let's call this IP Address 2) on this Class C network, it would send IP
Address 1 to Subnet A and IP Address 2 to Subnet B. The remaining nodes in each
subnet (A through D) on this network can contain up to 254 pieces of network
equipment (computers, printers, fax machines, bridges or routers, etc.).
Diagram of Subnetting a Network
Figure 9-1: Subnetting diagram
Still confused?
An easier method to explain this concept is to use the classic "mailing" analogy used in
IP addressing. Consider that this network, called Long Street, is four blocks long. There
are 254 houses on Long Street, and each block contains 64 houses. Houses 1 to 63
reside on Block A. Houses 64 to 127 reside on Block B. Houses 128 to 191 reside on
Block C. Houses 192 to 254 reside on Block D. Think of each block as a subnet. This
Internet
Router D
Router B
Router C
Computer Computer
Computer
Computer
Computer Computer Computer
Computer Computer Computer
Long Street
Subnet A
IP Address: 192.0.2.1
Subnet Mask: 255.255.255.192
Subnet B
IP Address: 192.0.2.64
Subnet Mask: 255.255.255.192
Subnet C
IP Address: 192.0.2.128
Subnet Mask: 255.255.255.192
Subnet D
IP Address: 192.0.2.192
Subnet Mask: 255.255.255.192
Router A