IP: policy routing

modulename: fib_rules.ko

configname: CONFIG_IP_MULTIPLE_TABLES

Linux Kernel Configuration
└─>Networking
└─>Networking options
└─>IP: policy routing
In linux kernel since version 2.6.12  
Normally, a router decides what to do with a received packet based
solely on the packet's final destination address. If you say Y here,
the Linux router will also be able to take the packet's source
address into account. Furthermore, the TOS (Type-Of-Service) field
of the packet can be used for routing decisions as well.

If you are interested in this, please see the preliminary
documentation at <http://www.compendium.com.ar/policy-routing.txt>
and <ftp://post.tepkom.ru/pub/vol2/Linux/docs/advanced-routing.tex>.
You will need supporting software from
<ftp://ftp.tux.org/pub/net/ip-routing/>.

If unsure, say N.

source code: