Section 3 - Configuration

Router Metric: The additional cost of the routing a packet through this router. The normal value for a simple network is 1. This metric is added to routes learned from other routers; it is not added to static or system routes.

Act as default router: Make this router the preferred destination for packets that are not otherwise destined.

Allow RIP updates For security, disable this option unless required by the ISP. from WAN:

RIP Password: RIP Version 2 supports the use of a password to limit access to routers through the RIP protocol. If the ISP or other LAN router requires a RIP password, enter the password here.

Verify RIP Password: Re-enter the password.

Enable IGMP: IGMP must be enabled if any applications on the LAN participate in a multicast group. If you have a multimedia LAN application that is not receiving content as expected, try enabling IGMP.

DNS Relay: When DNS Relay is enabled, the router plays the role of a DNS server. DNS requests sent to the router are forwarded to the ISP’s DNS server. This provides a constant DNS address that LAN computers can use, even when the router obtains a different DNS server address from the ISP upon re-establishing the WAN connection. You should disable DNS relay if you implement a LAN-side DNS server as a virtual server.

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D-Link DI-724GU manual