CONFIG_IP_ADVANCED_ROUTER:                                               
                                                                         
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.