ZyXEL NBG6503 Manuel d'utilisateur télécharger pdf (Page 179)

Appendix A IP Addresses and Subnetting

NBG6503 User’s Guide

179

IP Address Conflicts

Each device on a network must have a unique IP address. Devices with duplicate IP addresses on

the same network will not be able to access the Internet or other resources. The devices may also

be unreachable through the network.

Conflicting Computer IP Addresses Example

More than one device can not use the same IP address. In the following example computer A has a

static (or fixed) IP address that is the same as the IP address that a DHCP server assigns to

computer B which is a DHCP client. Neither can access the Internet. This problem can be solved by

assigning a different static IP address to computer A or setting computer A to obtain an IP address

automatically.

Figure 124 Conflicting Computer IP Addresses Example

Conflicting Router IP Addresses Example

Since a router connects different networks, it must have interfaces using different network

numbers. For example, if a router is set between a LAN and the Internet (WAN), the router’s LAN

and WAN addresses must be on different subnets. In the following example, the LAN and WAN are

on the same subnet. The LAN computers cannot access the Internet because the router cannot

route between networks.

Figure 125 Conflicting Router IP Addresses Example

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ZyXEL NBG6503 Manuel d'utilisateur Page 179