Netgear RH348 User Manual download pdf (Page 30)

Reference Guide for the Model RT328 and Model RH348 ISDN Routers

1-12 Introduction

Table 1-2 displays several common netmask values in both the dotted-decimal and the

masklength formats.

NETGEAR strongly advises that all hosts on a LAN segment use the same netmask for the

following reasons:

• So that hosts recognize local IP broadcast packets

When a device broadcasts to its segment neighbors, it uses a destination address of the local

network address with all ones for the host address. In order for this scheme to work, all devices

on the segment must agree on which bits comprise the host address.

• So that a local router or bridge will know which addresses are local and which are remote

Private IP Addresses

If your networks are isolated from the Internet (for example, only between your two branch

ofﬁces), you can assign any IP addresses to the hosts without problems. However, the IANA has

reserved the following three blocks of IP addresses speciﬁcally for private networks:

10.0.0.0 - 10.255.255.255

172.16.0.0 - 172.31.255.255

192.168.0.0 - 192.168.255.255

NETGEAR recommends that you choose your private network number from this list.

Table 1-2. Netmask Formats

Dotted-Decimal Masklength

255.0.0.0 /8

255.255.0.0 /16

255.255.255.0 /24

255.255.255.128 /25

255.255.255.192 /26

255.255.255.224 /27

255.255.255.240 /28

255.255.255.248 /29

255.255.255.252 /30

255.255.255.254 /31

255.255.255.254 /32

Intro.fm Page 12 Tuesday, October 10, 2000 3:15 PM

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Netgear RH348 User Manual Page 30