cisco vpn config
http://www.blindhog.net/cisco-how-to-configure-an-ipsec-vpn/
http://techrepublic.com.com/5208-6230-0.html?forumID=102&threadID=241085&start=0
http://techrepublic.com.com/5208-1035-0.html?forumID=101&threadID=304827
http://www.linuxhomenetworking.com/cisco-hn/vpn-cisco.htm
http://ciscogeek.org/create-vpn-over-internet/
http://nik.bmf.hu/schubert.tamas/Az%20int%E9zm%E9nyi%20informatikai%20biztons%E1g%20gyakorlata/Site-to-Site%20VPN/Site-to-Site%20VPN-Cisco%20Router.pdf
http://feczo.nmi.rulez.org/vpn/szakdolgozat/node4.html
https://nws.niif.hu/ncd2001/docs/eloadas/98/index.htm
http://www.cisco.com/en/US/products/hw/routers/ps221/prod_configuration_guide09186a008007cfa7.html
http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/ezvpn505.html
http://www.cisco.com/en/US/docs/security/asa/asa80/getting_started/asa5505/quick/guide/rem_acc.html