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The IPsec Transport Protocols
NetWAYS/ISDN – 3 Remote Access with NetWAYS/ISDN 41
The diagram below shows sample IP addresses for source
and destination in the two packet headers:
IP addresses in the original and encapsulating packet headers
The IPsec Transport Protocols
IPsec uses two different transport protocols: Authentication
Header (AH) and Encapsulating Security Payload (ESP).
These two protocols can be combined, and can be used in
both Tunnel and Transport Modes.
Properties of the Authentication Header (AH)
Authenticates the source of the payload data: AH in-
cludes a mechanism that allows the recipient to verify
whether the source of the data is authentic.
Ensures the integrity of the payload data: The same
mechanism that provides authentication also allows
the recipient to detect any manipulation of the payload
data.
Prevents replay and detects man-in-the-middle attacks:
AH contains a unique serial number that can be used to
identify packets replayed by a third party.
AH does not provide encryption of the data payload.
Packet in its original state and with Authentication Header
Payload data
IP header
Payload data (possibly encrypted)
IP headerIPsec
New IP header
IP address of the sender: 172.16.0.10
IP address of the recipient: 172.16.0.1
Original packet
IPsec-encapsulated packet with new IP header in
Tunnel Mode
IP address of the sender: IP address assigned
IP address of the recipient: 193.96.242.157
by the Internet Service Provider
Payload data
IP header
Original pac ket
Payload data
IP header
Packet with Authentication Header in Tunnel Mode
New IP header
Authentication
Header
netways-e.book Seite 41 Freitag, 28. November 2003 3:51 15
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