I am planning on building a router from an old pc. it will be running pfsense and will be capable enough that the cpu is maxed out and not able to fully run the os. I plan on using the mobo Ethernet pron connected tot eh modem WAN and then getting like a $10 ethernet pci card which will go back to my old router which i will disable dhcp and everything so it just acts as a acsess point and a switch. How effective will this router be? What do I have to do do disable my old router from interfering with this new one as well. thanks for your help 
