ZyXEL P-2812HNU-51c User Manual download pdf (Page 464)

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Appendix D IP Addresses and Subnetting

P-2812HNU-51c User’s Guide

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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 222 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

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