What exactly do ipsec and ssl do?

What are the advantages/disadvantages of SSL and IPSec for VPN?

• Answer:

  the advantages of SSL VPN are no any client software needed in the client computer, they just need a web browser that can support SSL protocol is enough, because no any client software needed in the client computer, so no any additional license cost needed for the client pc to connect to the host. besides that, it is easy to use and setup, so the IT department staff no need to worry about the configuration for the worker who want to use the VPN. the disadvantages of ssl vpn are client computer security. because the ssl vpn offer a much greater choice of client platform with 'clientless' or 'near client less' operation, so the security of any client connecting to the network must be heavily scrutinised. Timeouts and re-authentication - To avoid systems being left connected to the network by users, sessions can be terminated after periods of inactivity. Also, to ensure the correct user is still using the connection, periodic authentication during a session can be implemented on some systems