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S12700 V200R011C10 Configuration Guide - User Access and Authentication

This document describes the working mechanisms, configuration procedures, and configuration examples of User Access and Authentication features, such as AAA, DAA, NAC, PPPoE, Policy Association, and IP session.
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(Optional) Setting ARP Probe Parameters

(Optional) Setting ARP Probe Parameters

Context

Using the DHCP protocol, a server leases IP addresses to clients. Clients need to apply for new IP addresses when the leases expire. In practice, a client who already has a leased IP address does not send a Release message to the DHCP server after going offline unexpectedly.

In this case, the device needs to periodically send ARP probes to check whether users are online. When ARP probes expire, users are disconnected. In addition, DHCP Release messages are constructed and sent to the DHCP server to enable the DHCP server to release the IP addresses of the users.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number.subnumber

    The sub-interface view is displayed.

  3. Run dhcp user-detect retransmit times interval interval

    The interval for sending ARP probes and the maximum number of timeouts are set.

    By default, the interval for sending ARP probes is 30 seconds and the maximum number of timeouts is 5.

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Updated: 2019-10-21

Document ID: EDOC1000178117

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