The following options all relate to routing. Except for defining the default route, everything related to routing is covered here. The default route is listed under "Basic Options."
option ip-forwarding 0 | 1 0 tells the client to disable IP forwarding, and 1 says to enable it.
option non-local-source-routing 0 | 1 0 tells the client to disable non-local source routing, and 1 says to enable it. 0 is more secure. Source routes are a potential security problem that can allow intruders to route data off of the local network.
option policy-filter address/mask Lists the only valid destination/mask pairs for incoming source routes. Any source-routed datagram whose next-hop address does not match one of the filters is discarded by the client.
option router-discovery 0 | 1 1 means the client should locate routers with the RFC 1256 Router Discovery mechanism, and 0 means it shouldn't. Because the DHCP server can provide the correct list of routers, router discovery is not commonly used on networks that have a DHCP server.
option router-solicitation-address address Defines the address to which the client should send RFC 1256 Router Discovery requests.
option static-routes destination gateway[,... ] Defines static routes for the client as a list of destination and gateway pairs.
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