Zyxel-communications P-2302HWL-P1 Series Manual do Utilizador descarregar pdf (Página 304)

P-2302HW/HWL-P1 Series User’s Guide

304 Appendix C IP Addresses and Subnetting

The first mask shown is the class “C” natural mask. Normally if no mask is specified it is

understood that the natural mask is being used.

Example: Two Subnets

As an example, you have a class “C” address 192.168.1.0 with subnet mask of 255.255.255.0.

The first three octets of the address make up the network number (class “C”).

To make two networks, divide the network 192.168.1.0 into two separate subnets by

converting one of the host ID bits of the IP address to a network number bit. The “borrowed”

host ID bit can be either “0” or “1” thus giving two subnets; 192.168.1.0 with mask

255.255.255.128 and 192.168.1.128 with mask 255.255.255.128.

Note: In the following charts, shaded/bolded last octet bit values indicate host ID bits

“borrowed” to make network ID bits. The number of “borrowed” host ID bits

determines the number of subnets you can have. The remaining number of

host ID bits (after “borrowing”) determines the number of hosts you can have

on each subnet.

255.255.255.240 /28 1111 0000 240

255.255.255.248 /29 1111 1000 248

255.255.255.252 /30 1111 1100 252

Table 139 Alternative Subnet Mask Notation (continued)

SUBNET MASK SUBNET MASK “1” BITS LAST OCTET BIT VALUE DECIMAL

Table 140 Two Subnets Example

IP/SUBNET MASK NETWORK NUMBER HOST ID

IP Address 192.168.1. 0

IP Address (Binary) 11000000.10101000.00000001. 00000000

Subnet Mask 255.255.255. 0

Subnet Mask (Binary) 11111111.11111111.11111111. 00000000

Table 141 Subnet 1

IP/SUBNET MASK NETWORK NUMBER

LAST OCTET BIT

VALUE

IP Address 192.168.1. 0

IP Address (Binary) 11000000.10101000.00000001. 00000000

Subnet Mask 255.255.255. 128

Subnet Mask (Binary) 11111111.11111111.11111111. 10000000

1 2 ... 299 300 301 302 303 304 305 306 307 308 309 ... 336 337

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