BIBLIOGRAPHIE
CISCO
http://www.cisco.com/warp/public/cc/techno/protocol/ipsecur/ipsec/tech/ipsec_wp.htm
http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/l2tun_ds.htm
http://www.cisco.com/warp/public/cc/techno/protocol/ipsecur/ipsec/tech/ipsec_wp.htm
MICROSOFT
http://www.microsoft.com
http://www.windows.com/windows2000/en/datacenter/help/sag_RASS_L2TP.htm
http://www.windows.com/windows2000/en/datacenter/help/sag_RASS_PPTP.htm
AUTRES
http://www.francetelecom.fr
http://www.transpac.fr
http://www.guill.net
http://www.worldcom.com/fr
http://www.9telecom.fr
http://wapiti.enic.fr/commun/ens/peda/options/ST/RIO/
http://www.checkpoint.com
http://www.checkpoint.com/products/vpn1/vpndef.html
http://www.iec.org/tutorials/vpn/