# Configuring the DHCP External Server Application

The following sections describe how to configure the DHCP external server application on the E Series router:

- DHCP External Server Overview
- Preservation of Dynamic Subscriber Interfaces with DHCP External Server Overview
- DHCP External Server Identification of Clients with Duplicate MAC Addresses Overview
- DHCP External Server Configuration Requirements
- Enabling and Disabling the DHCP External Server Application
- Monitoring DHCP Traffic Between Remote Clients and DHCP Servers
- Synchronizing the DHCP External Application and the Router
- Configuring Interoperation with Ethernet DSLAMs
- Configuring the DHCP External Server to Support the Creation of Dynamic Subscriber Interfaces
- Configuring DHCP External Server to Control Preservation of Dynamic Subscriber Interfaces
- Configuring Dynamic Subscriber Interfaces for Interoperation with DHCP Relay and DHCP Relay Proxy
- Deleting Clients from a Virtual Router’s DHCP Binding Table
- Configuring DHCP External Server to Uniquely Identify Clients with Duplicate MAC Addresses
- Configuring DHCP External Server to Re-Authenticate Auto-Detected Dynamic Subscriber Interfaces