Chapter 10 Managing Ip Address Assignment - Juniper EX3400 Features Manual

CHAPTER 10
Managing IP Address Assignment
Address-Assignment Pools Overview
Copyright © 2017, Juniper Networks, Inc.
Address-Assignment Pools Overview on page 121
Configuring How the Extended DHCP Local Server Determines Which
Address-Assignment Pool to Use on page 122
Example: Extended DHCP Local Server Configuration with Optional Pool
Matching on page 123
DHCP Auto Logout Overview on page 124
How DHCP Relay Agent Uses Option 82 for Auto Logout on page 126
Automatically Logging Out DHCP Clients on page 127
Assign a Specific IP Address to a Client Using DHCP Option 50 and DHCPv6 IA_NA
Option on page 128
Multiple Address Assignment for DHCPv6 Clients on page 129
The address-assignment pool feature supports subscriber management and DHCP
management functionality by enabling you to create centralized IPv4 and IPv6 address
pools independently of the client applications that use the pools. The authd process
manages the pools and the address allocation, whether the addresses come from local
pools or from a RADIUS server. For example, multiple client applications, such as DHCP,
can use the same address-assignment pool to provide addresses for their particular
clients. Client applications can acquire addresses for either authenticated or
unauthenticated clients.
Address-assignment pools support both dynamic and static address assignment. In
dynamic address assignment, a client is automatically assigned an address from the
address-assignment pool. In static address assignment, which is supported for IPv4 pools
only, you reserve an address that is then always used by a particular client. Addresses
that are reserved for static assignment are removed from the dynamic address pool and
cannot be assigned to other clients.
You can configure named address ranges within an address-assignment pool. A named
range is a subset of the overall address range. A client application can use named ranges
to manage address assignment based on client-specific criteria. For example, for IPv4
address-assignment pools, you might create a named range that is based on a specific
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