1. FireWall New York Office Paris Office Milan Office Hong Kong Office Internet

10. IPsec Everywhere! Router to Router PC to Router PC to Server Router to Firewall PC to Firewall

11. IPSec packet IKE negotiation SA IKE SA IKE Ipsec negotiation SA SA Tunnel

12. Authentication Data (00ABCDEF) Authentication Data (00ABCDEF) IP Header + Data IP Header + Data Uses keyed-MAC Router Firewall AH IP HDR Data Authenticated AH Provides Data Authentication

13. IP Header IPSec Header(s) AH/ESP IP Data (Encrypted) Interoperable Authentication, Integrity and Encryption

14. The Corporate Network