Information, Computer and Network Security Terms Glossary and
IPsec VPN refers to the virtual private nework basedon the IPsec technologies, which is the primary layer 3 VPN technology. The IPSec protocol typically works on the edges of a security domain, which encapsulates a packet by wrapping another packet around it. It then encrypts the entire packet. This encrypted stream of traffic forms a secure tunnel across an otherwise unsecured IP network.