ZyXEL Communications Prestige P-870HW-51a v2 - Manual (Page 246)

Appendix C IP Addresses and Subnetting
P-870HW-51a v2 User’s Guide
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The computer cannot access the Internet. This problem can be solved by
assigning a different IP address to the computer or the router’s LAN port.
Figure 155 Conflicting Computer and Router IP Addresses Example