• Explain how IPSec works.
• Configure IPSec.
• Troubleshoot IPSec.

What is IPSec?
VPN review, IP review, fragmentation, authentication, encryption, What is IPSec? AH, ESP. IPSec with IPv4, IPSec with IPv6. Hands on: Simple analysis of "normal" IP packets.

IPSec architecture
The IPSec protocols, transport mode, tunnel mode, implementations: Host tack, Bump in the Stack, Bump in the Wire. Hands on: Configuring IPSec.

AH
What AH does, the stack, security associations, Security Parameters Index, The AH header, AH in transport mode, AH in tunnel mode. Hands on: AH packet analysis.

ESP
What ESP does, the ESP header, ESP in transport mode, ESP in tunnel mode, ESP and SA, ESP and SPI. Hands on: ESP packet analysis.

Algorithms
Authentication algorithms: MD5, keyed SHA-1, HMAC-MD5, HMAC-SHA-1, HMAC-RIPEMD, other authentication algorithms. Encryption algorithms: DES, 3DES, Blowfish, AES, other encryption algorithms. Hands on: Algorithm configuration.

IKE
Top ISPs, Tier 1, Tier 2 and Tier 3 ISPs, backbone providers, circuit providers, content providers, virtual ISPs, the internal network of ISPs, ATM, SDH, POS and MPLS.

Peering points
Public peering versus private peering, NAPs, Internet Exchanges, Metropolitan Area Exchanges, LINX, other major peering points, the geography of the Internet.

Internet security considerations
Firewalls, Proxy servers, IPSec, VPNs, PPTP, L2F, L2TP.

Internet futures
Internet 2, Mbone, 6Bone.