http://evilbad.altervista.org/ftp/Tutto%20CISCO/Cisco%20827%20837.txt
http://www.di.unisa.it/~ads/corso-security/www/CORSO-0203/Cisco/cisco827_htm/cisco827_conf_tipica.htm
http://www.1e2.it/configurazione-funzionante-router-modem-wifi-cisco-serie-857-877w/

#nat
http://www.netsetup.it/cisco-ccna/configurazione-nat-router-cisco

#log
https://supportforums.cisco.com/document/24661/how-configure-logging-cisco-ios