January 2004
Intermediate to advanced
536 pages
13h 2m
English
Content preview from IPv6, 2nd Edition
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106 Part Two • IPv6 Protocols
Security
Gateway
Network
Stack
Message
TCP/IP
Network
Stack
TCP/IP
Packet
to
X
Security
Gateway
Y
A
Message
B
B
Packet
to
Y
Packet
to
Y
Packet
to
Y
Packet
to
B
Packet
to
B
Packet
to
B
Packet
to
B
Figure 6–2: Using a secure tunnel.
6.5 IP and IPsec
IPsec provides security services for either IPv4 or IPv6, but the way it
provides those services is slightly different in each. When used with IPv4,
IPsec headers are inserted after the IPv4 header and before the next-layer
protocol header.
IPv6 simplifies header processing: Every IPv6 packet header is the same
length, 40 octets, but any options can be accommodated in extension
Chapter 6 • The IP Security Protocol (IPsec) ...
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