how to set vpn ipsec
The most common mechanism used to provideprivacy and data integrity for data in a VPN session isInternet protocol security (IPSec) encryption andauthentication [12]. When a VPN session is established between a client and a VPN gateway (i.e., anenterprise VPN gateway or an IPSS), the clientreceives an Internet protocol (IP) address that belongsto the enterprise subnet. Each IP packet generated bythe client contains this address as the source IP addressin its headers. The packet is encrypted to provide privacy and then authenticated to provide data integrity.Information about the encryption and authenticationis added to the packet by encapsulating it within an IPSec header [13, 14]. The IPSec packet is then sent tothe VPN gateway by encapsulating it within anotherIP header. This encapsulating IP header has as itssource IP address the IP address provided by the NSPto the client. The destination IP address is that of theVPN gateway. The IPSec-encrypted VPN session fromthe client machine to the VPN gateway is referred toas an IPSec tunnel
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