Figure 25: Physical Wan Port Settings - D-Link DSR-500 User Manual

Unified Services Router
The default MAC address is defined during the manufacturing process for the
interfaces, and can uniquely identify this router. You can customize each WAN port's
MAC address as needed, either by letting the WAN port assume the current LAN
host's MAC address or by entering a MAC address manually.

Figure 25: Physical WAN port settings

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User Manual