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Configuration Guide - IP Service

CloudEngine 8800, 7800, 6800, and 5800 V200R002C50

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Configuring ARP-Ping IP

Configuring ARP-Ping IP

Context

ARP-Ping IP sends ARP packets onto a LAN to check whether an IP address is being used by another device on the LAN.

The ping command can also check whether an IP address is in use. If the destination host or the switch configured with the firewall function are configured not to reply to ping packets, there is no response to the ping packet. Consequently, the IP address is considered unused. ARP is a Layer 2 protocol. In most cases, ARP packets can pass through the firewall that is disabled from replying to the Ping packets to prevent the preceding situation.

Procedure

  • Run ping arp ip ip-host [ interface interface-type interface-number [ vlan-id vlan-id ] ] [ timeout timeout ]

    Check whether the IP address is used.

    • If the following information is displayed, the IP address is not used.

      <HUAWEI> ping arp ip 10.1.1.2
       ARP-Pinging 10.1.1.2:
      
      Error: Request timeout.
      Error: Request timeout.
      Error: Request timeout.
      Info: The IP address is not used by anyone.
    • If the following information is displayed, the IP address is used.

      <HUAWEI> ping arp ip 10.1.1.1
       ARP-Pinging 10.1.1.1:
      
      10.1.1.1 is used by 00e0-517d-f202       

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Updated: 2019-03-21

Document ID: EDOC1000166635

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