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The Linux kernel configuration item CONFIG_IP_ADVANCED_ROUTER:
(none)If you intend to run your Linux box mostly as a router, i.e. as a computer that forwards and redistributes network packets, say Y; you will then be presented with several options that allow more precise control about the routing process.
The answer to this question won't directly affect the kernel: answering N will just cause the configurator to skip all the questions about advanced routing.
Note that your box can only act as a router if you enable IP forwarding in your kernel; you can do that by saying Y to "/proc file system support" and "Sysctl support" below and executing the line
echo "1" > /proc/sys/net/ipv4/ip_forward
at boot time after the /proc file system has been mounted.
If you turn on IP forwarding, you should consider the rp_filter, which automatically rejects incoming packets if the routing table entry for their source address doesn't match the network interface they're arriving on. This has security advantages because it prevents the so-called IP spoofing, however it can pose problems if you use asymmetric routing (packets from you to a host take a different path than packets from that host to you) or if you operate a non-routing host which has several IP addresses on different interfaces. To turn rp_filter on use:
echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter or echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
Note that some distributions enable it in startup scripts. For details about rp_filter strict and loose mode read Documentation/networking/ip-sysctl.rst.
If unsure, say N here.
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