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Technical Documentation

DHCP for Subscriber Access, Release 9.5

The Dynamic Host Configuration Protocol (DHCP) technology enables you to provide access to subscribers. Access and services start when the router receives a message from a subscriber (such as a DHCP discover message).

You can configure the router to act as a DHCP local server or as a DHCP relay agent. The DHCP local server provides an IP address and other configuration information in response to a subscriber request; the DHCP relay agent forwards DHCP request and reply packets between a DHCP subscriber and a DHCP server.

In addition, you can configure address-assignment pools to enable different DHCP client applications to share address pools.

OverviewConfigurationAdministrationTroubleshooting
Configuration Tasks for DHCP Local Server

Using External AAA Authentication Services with DHCP

Configuring How the Extended DHCP Local Server Determines Which Address-Assignment Pool To Use

Grouping Interfaces with Common DHCP Configurations

Overriding Default DHCP Local Server Configuration Settings

Automatically Logging Out DHCP Clients

Attaching Dynamic Profiles to DHCP Subscriber Interfaces

Configuring Passwords for Usernames

Creating Unique Usernames for DHCP Clients

Tracing Extended DHCP Operations
Configuration Tasks for DHCP Relay Agent

Using External AAA Authentication Services with DHCP

Grouping Interfaces with Common DHCP Configurations

Overriding the Default DHCP Relay Configuration

Automatically Logging Out DHCP Clients

Enabling and Disabling Insertion of Option 82 Information

Using Option 60 Information to Forward Client Traffic to Specific DHCP Servers

Configuring Server Groups

Configuring Active Server Groups

Enabling DHCP Relay Proxy Mode

Configuring Dynamic Access Routes for DHCP Subscriber Management

Configuring Dynamic Access-Internal Routes for DHCP Subscriber Management

Attaching Dynamic Profiles to DHCP Subscriber Interfaces
DHCP Local Server Examples

Example: Minimum Extended DHCP Local Server Configuration

Example: Extended DHCP Local Server Configuration with Optional Pool Matching
DHCP Relay Examples

Example: Minimum DHCP Relay Agent Configuration

Example: DHCP Relay Agent Configuration with Multiple Clients and Servers

Example: Using Option 60 Strings to Forward DHCP Client Traffic

Example: Using Option 60 Strings to Drop DHCP Client Traffic
Configuration Statements

[edit system services dhcp-local-server] Hierarchy Level

[edit forwarding-options dhcp-relay] Hierarchy Level

active-server-group (Relay)

always-write-giaddr (Relay)

always-write-option-82 (Relay)

authentication (Local)

authentication (Relay)

circuit-id (Relay)

circuit-type (Local)

circuit-type (Relay)

client-discover-match (Local)

client-discover-match (Relay)

default-local-server-group (Relay)

default-relay-server-group (Relay)

delimiter (Local)

delimiter (Relay)

dhcp-local-server (Local)

dhcp-relay (Relay)

disable-relay (Relay)

domain-name (Local)

domain-name (Relay)

drop (Relay)

dynamic-profile (Local)

dynamic-profile (Relay)

group (Local)

interface (Local)

interface-client-limit (Local)

interface-client-limit (Relay)

ip-address-first (Local)

layer2-unicast-replies (Relay)

logical-system-name (Local)

logical-system-name (Relay)

mac-address (Local)

mac-address (Relay)

no-arp (Local)

no-arp (Relay)

option-60 (Local)

option-60 (Relay)

option-82 (Local; authentication)

option-82 (Local; address-assignment pools)

option-82 (Relay)

overrides (Local)

overrides (Relay)

password (Local)

password (Relay)

pool-match-order (Local)

prefix (Relay)

proxy-mode (Relay)

relay-option-60 (Relay)

relay-option-82 (Relay)

routing-instance-name (Local)

routing-instance-name (Relay)

server-group (Relay)

trust-option-82 (Relay)

user-prefix (Local)

user-prefix (Relay)

username-include (Local)

username-include (Relay)

vendor-option (Relay)

Knowledge Base

http://kb.juniper.net/
Acquiring Troubleshooting Information

Tracing Extended DHCP Operations
Troubleshooting Configuration Statements

traceoptions (Local)

traceoptions (Relay)

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