D-Link DI-1750 Reference Manual page 298

Model Name
configure explanation
Policy routing is enabled on interface f0/0. For packets origined from 10.1.1.2, the gateway is 13.1.1.99 if
13.1.1.99 is reachable, if 13.1.1.99 isn't reachable, destination base routing is used. For packes from 10.1.1.21,
route-map pbr 30 is used, for load-balance key word is used, both 13.1.1.99 and 14.1.1.99 will be used as the
gateway.
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