HP VPN Firewall Appliances Network Management Configuration Guide

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Figure 372 IPv6 prefix assignment
DHCPv6 address pool
The DHCP server selects IPv6 addresses, IPv6 prefixes, DNS server addresses, and other parameters
from an address pool and assigns them to the DHCP clients.
Address allocation mechanisms
DHCPv6 supports the following address allocation mechanisms:
• Static address allocation—To implement static address allocation for a client, create a DHCPv6
address pool, and manually bind the DUID (or the DUID and IAID) of the client to an IPv6 address
in the DHCPv6 address pool. When the client requests an IPv6 address, the DHCPv6 server assigns
the IPv6 address in the static binding to the client.
• Dynamic address allocation—To implement dynamic address allocation for clients, create a
DHCPv6 address pool, specify a subnet for the pool, and divide the subnet into temporary and
non-temporary IPv6 address ranges. Upon receiving a DHCP request, the DHCPv6 server selects an
IPv6 address from the temporary or non-temporary IPv6 address range based on the address type
specified in the client request.
Prefix allocation mechanisms
DHCPv6 supports the following prefix allocation mechanisms:
• Static prefix allocation—To implement static prefix allocation for a client, create a DHCPv6 address
pool, and manually bind the DUID (or the DUID and IAID) of the client to an IPv6 prefix in the
DHCPv6 address pool. When the client requests an IPv6 prefix, the DHCPv6 server assigns the IPv6
prefix in the static binding to the client.
• Dynamic prefix allocation—To implement dynamic prefix allocation for clients, create a DHCPv6
address pool and a prefix pool, specify a subnet for the address pool, and apply the prefix pool to
the address pool. Upon receiving a DHCP request, the DHCPv6 server dynamically selects an IPv6
prefix from the prefix pool in the address pool.
Address/prefix selection
The DHCPv6 server observes the following principles to select an IPv6 address or prefix for a client:
1. If there is an address pool where an IPv6 address or prefix is statically bound to the DUID or IAID
of the client, the DHCPv6 server selects this address pool and assigns the statically bound IPv6
address or prefix and other configuration parameters to the client.