ZyXEL Communications ZyXEL Prestige P-870HW-51a v2 User Manual page 246

Appendix C IP Addresses and Subnetting
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
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P-870HW-51a v2 User's Guide