Figure 27: Physical Wan Port Settings - D-Link DSR-250 User Manual

Unified Services Router
The default MTU size supported by all ports is 1500. This is the largest packet size
that can pass through the interface without fragmentation. This size can be increased,
however large packets can introduce network lag and bring down the interface speed.
Note that a 1500 byte size packet is the largest allowed by the Ethernet protocol at the
network layer.
The port speed can be sensed by the router when Auto is selected. With this option the
optimal port settings are determined by the router and network. The duplex (half or
full) can be defined based on the port support, as well as on e of three port speeds: 10
Mbps, 100 Mbps and 1000 Mbps (i.e. 1 Gbps). The default setting is 100 Mbps for all
ports.
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 27: Physical WAN port settings

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User Manual