Entrust nShield 5c Installation Manual page 28

9.2.1.1.1. IPv6 addresses
An IPv4 address is 32 bits long and typically represented as 4 octets, for example
192.168.0.1. An IPv6 address is 128 bits long and is made up of a subnet prefix (n bits
long) and an interface ID (128 - n bits long).
An IPv6 address and its associated subnet is typically represented by the notation ipv6-
address/prefix-length, where:
• ipv6-address is an IPv6 address represented in any of the notations described below.
• prefix-length is a decimal value specifying how many of the leftmost contiguous bits
of the address make up the prefix.
The IPv6 address notation mirrors the way subnets are represented in the IPv4 Classless
Inter-Domain Routing (CIDR) notation.
9.2.1.1.2. IPv6 address notation
An nShield nShield 5c will accept an IPv6 address if it is entered in one of the forms
shown below and if the address is valid for context in which it is used. There are two
conventional forms for representing IPv6 addresses as text strings:
• The long representation is x:x:x:x:x:x:x:x, where each
hexadecimal characters
For example:
1234:2345:3456:4567:5678:6789:789a:89ab
1234:5678:0:0:0:0:9abc:abcd/64
• If one or more consecutive fields are 0 then they can be replaced by ::.
For example:
1234:5678:0:0:0:0:9abc:abcd/64
::
can only appear once in an IPv6 address.
Unless the address is a link-local address, the nShield nShield 5c front panel only allows
lower-case letters in an IPv6 address.
IPv6 addresses keyed manually on the nShield nShield 5c front panel are validated on
entry by the nShield nShield 5c. As well as checking that the format of the address is
correct, the nShield nShield 5c also validates that the address entered is valid for the
context in which it will be used, see
If Stateless Address Auto Configuration (SLAAC) is enabled the nShield nShield 5c will
nShield® 5c Installation Guide
to ffff) for each 16 bits of the address.
(0
can be written as
Acceptable IPv6 address by use
x
is a field containing
1234:5678::9abc:abcd/64
case.
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