Billion Electric Company BiGuard 2 - Manual (Page 144)

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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.
E.2.3 Tunnel Mode AH
AH is typically applied to a data packet in the following manner:
E.2.4 Tunnel Mode ESP
Here is an example of a packet with ESP applied:
AH/E TC IP Dat