Instructions on how to setup the QuickVPN system on Linksys/Cisco routers can be found here:
http://www.cisco.com/en/US/products/ps9923/products_qanda_item09186a0080a35905.shtml
Internal note: Addition information can be found on this document:
https://tech90.com/kbase/support/WRVS4400N-QuickVPN%20Setup.pdf