Chapter Summary

This chapter examines the usage and troubleshooting of IPSec on your network. IPSec can be used to secure communications both on your intranet and between endpoints over the Internet. VPNs can be created using IPSec and L2TP to ensure authenticity, integrity, and confidentiality of data in transit. The IPSec implementation in Windows Server 2003 has received several improvements since Windows 2000, most notably the capability to pass through NAT devices. Also, the Diffie-Hellman key exchange has been increased to a maximum of 2,048 bits to further increase the security of the secret key.