ZyXEL Communications Prestige P-870HW-51a v2 - Manual (Page 245)

Appendix C IP Addresses and Subnetting
P-870HW-51a v2 User’s Guide
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address to computer A or setting computer A to obtain an IP address
automatically.
Figure 153 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 154 Conflicting Computer IP Addresses Example
Conflicting Computer and Router IP Addresses Example
More than one device can not use the same IP address. In the following example,
the computer and the router’s LAN port both use 192.168.1.1 as the IP address.