References

For information about IPSec, see the following RFCs:

RFC 768—User Datagram Protocol (August 1980)
RFC 2401—Security Architecture for the Internet Protocol (November 1998)
RFC 2402—IP Authentication Header (November 1998)
RFC 2403—The Use of HMAC-MD5-96 within ESP and AH (November 1998)
RFC 2404—The Use of HMAC-SHA-1-96 within ESP and AH (November 1998)
RFC 2405—The ESP DES-CBC Cipher Algorithm With Explicit IV (November 1998)
RFC 2406—IP Encapsulating Security Payload (ESP) (November 1998)
RFC 2407—The Internet IP Security Domain of Interpretation for ISAKMP (November 1998)
RFC 2408—Internet Security Association and Key Management Protocol (ISAKMP) (November 1998)
RFC 2409—The Internet Key Exchange (IKE) (November 1998)
RFC 2410—The NULL Encryption Algorithm and Its Use With IPSec (November 1998)
RFC 3706—A Traffic-Based Method of Detecting Dead Internet Key Exchange (IKE) Peers (February 2004)

For information about using digital certificates, see Configuring Digital Certificates.