Tunnel Mode Ah - Billion BiGuard 50G User Manual

IP AH/E
Transport Mode
- This mode is used to provide data security between two networks. It provides
protection for the entire IP packet and is sent by adding an outer IP header
corresponding to the two tunnel end-points. Since tunnel mode hides the original IP
header, it provides security of the networks with private IP address space.
IP AH/E
E.2.3 Tunnel Mode AH
AH is typically applied to a data packet in the following manner:
Original Packet
IP Header
Packet with IPSec Authentication Header
New IP Header
IP TC Dat
TC Dat
TCP Data
Org IP Header
AH
175
TCP
Authenticated
Data