Embedded DHCP Local Server Overview

The router offers an embedded DHCP server, known as the DHCP local server. The DHCP local server has two modes: equal-access and standalone.

Note: E Series routers also support an embedded DHCP version 6 (DHCPv6) local server. The DHCPv6 local server provides a subset of the features of the DHCP local server. For information about configuring the DHCPv6 local server, see Configuring the DHCPv6 Local Server.

• In equal-access mode, the DHCP local server works with the Juniper Networks SRC software to provide an advanced subscriber configuration and management service.
• In standalone mode, the DHCP local server provides a basic DHCP service, and also allows you to configure AAA authentication for incoming DHCP clients. Also, after successful authentication, the DHCP local server uses the information in the client’s AAA subscriber record together with the client’s DHCP parameters to select the IP address pool used for address assignment.

  DHCP local server also supports RADIUS accounting, including interim accounting, in standalone mode. This feature allows you to use RADIUS start and stop attributes to track user events such as the lifetime of an IP address.

DHCP Local Server and Client Configuration

You can use DHCP to configure the router to allow remote access to non-PPP clients. DHCP-based access is also an alternative to PPP in environments such as Public Wireless LANs (PWLANs). In PWLANS, a user scans for available broadband networks, then is redirected to a web-based authentication mechanism to request service.

DHCP provides address assignment information for users. Authentication, authorization, and accounting are separate processes, and are up to the Internet service provider (ISP) to define.

The DHCP local server can configure a client with the following DHCP options:

• Default router
• DNS server
• Domain name
• Lease time
• Grace period for address lease
• NetBIOS name server
• NetBIOS node type
• Subnet mask