Routing Configuration; Routing Mode; Figure 23: Protocol Binding Setup To Associate A Service And/Or Lan Source To A Wan And/Or Destination Network - D-Link DSR-500 User Manual

Unified Services Router
addresses can be assigned to the other WAN link. Protocol bindings are only
applicable when load balancing mode is enabled and more than one WAN is
configured.
Figure 23: Protocol binding setup to associate a service and/or LAN
source to a WAN and/or destination network

3.5 Routing Configuration

Routing between the LAN and WAN will impact the way this router handles traffic
that is received on any of its physical interfaces. The routing mode of the gateway is
core to the behavior of the traffic flow between the secure LAN and the internet.

3.5.1 Routing Mode

Setup > Internet Settings > Routing Mode
This device supports classical routing, network address translation (NAT), and
transport mode routing.

With classical routing, devices on the LAN can be directly accessed from the
internet by their public IP addresses (as suming appropriate firewall settings). If
your ISP has assigned an IP address for each of the computers that you use,
select Classic Routing.
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User Manual