IPv6 Management Security Features

Authorized IP Managers for IPv6

Figure 6-7 shows the bits in the fourth block of the mask that determine the valid subnets in which authorized stations with an IPv6 device ID of 244:17FF:FEB6:D37D reside.

FFF8 in the fourth block of the mask means that bits 3 - 15 of the block are fixed and, in an authorized IPv6 address, must correspond to the “on” and “off” settings shown for the binary equivalent 0000 in the fourth block of the IPv6 address. Conversely, bits 0 - 2 are variable and, in an authorized IPv6 address, may be either “on” (1) or “off” (0).

As a result, assuming that the seventh and eighth bytes (fourth hexadecimal block) of an IPv6 address are used as the subnet ID, only the following binary expressions and hexadecimal subnet IDs are supported in this authorized IPv6 manager configuration:

Authorized Subnet ID in Fourth

Binary Equivalent

Hexadecimal Block of IPv6 Address

 

 

 

0000

0000 0000

0001

0000 0001

0002

0000 0010

0003

0000 0011

0004

0000 0100

0005

0000 0101

0006

0000 0110

0007

0000 0111

 

 

Figure 6-8. Binary Equivalents of Authorized Subnet IDs (in Hexadecimal)

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