ZyXEL Communications Prestige P-870HW-51a v2 - Manual (Page 211)

Appendix A Setting Up Your Computer’s IP Address
P-870HW-51a v2 User’s Guide
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• In the Router field, enter the IP address of your ZyXEL Device.
Figure 123 Mac OS X 10.5: Network Preferences > Ethernet
6
Click Apply and close the window.