Netcomm NB5Plus4 Manuel d'utilisateur télécharger pdf (Page 22)

NB5Plus4/W Quick Start Guide YML755Rev1

22 www.netcomm.com.au

What is a Gateway?

The Internet is so large that a single network cannot handle all of the trafﬁc and still deliver

a reasonable level of service. To overcome this limitation, the network is broken down into

smaller segments or subnets that can deliver good performance for the stations attached to that

segment. This segmentation solves the problem of supporting a large number of stations, but

introduces the problem of getting trafﬁc from one subnet to another.

To accomplish this, devices called routers or gateways are placed between segments. If a

machine wishes to contact another device on the same segment, it transmits to that station

directly using a simple discovery technique. If the target station does not exist on the same

segment as the source station, then the source actually has no idea how to get to the target.

One of the conﬁguration parameters transmitted to each network device is its default gateway.

This address is conﬁgured by the network ad min is trators and it informs each personal com-

puter or other network device where to send data if the target station does not reside on the

same subnet as the source. If your machine can reach all stations on the same subnet (usually

a building or a sector within a building), but cannot communicate outside of this area, it is usu-

ally because of an in correctly conﬁgured default gateway.

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Netcomm NB5Plus4 Manuel d'utilisateur Page 22