http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080093fca.shtml
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t4/feature/guide/ftnatrt.html
————————————————————————————————
http://ccnprecertification.com/2005/04/01/nat-using-a-route-map/
http://ccnprecertification.com/archives/nat_overview-251004.html
http://ccnprecertification.com/archives/nat-230305.html
http://ccnprecertification.com/archives/ip_nat_outside_source-310305.html