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Configuration Guide - Security

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of Security, including ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, Port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, separating the management plane from the service plane, security risks.
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Configuring DAI

Configuring DAI

Context

Configuring DAI on an access device can prevent MITM attacks and theft on authorized users' information. After DAI is configured, the device compares the source IP address, source MAC address, and interface number in the received ARP packet with binding entries. If the ARP packet matches a binding entry, the device considers the ARP packet valid and allows the packet to pass through. If the ARP packet does not match a binding entry, the device considers the ARP packet invalid and discards the packet.

NOTE:
  • This function is available only for DHCP snooping scenarios. The device enabled with DHCP snooping generates DHCP snooping binding entries when DHCP users go online. If a user uses a static IP address, you need to manually configure a static binding entry for the user. For details about the DHCP snooping configuration, see DHCP Snooping Configuration. For details on how to configure a static binding entry, see Configuring a Binding Table.

  • When the protocol packet transparent transmission in a VLAN is enabled together with the DAI function, the protocol packet transparent transmission function does not take effect.

  • CE5880EI and CE6880EI do not support the function.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run arp anti-attack check user-bind enable

    DAI is enabled.

    By default, DAI is disabled.

  4. (Optional) Run arp anti-attack check user-bind check-item { ip-address | mac-address | interface }*

    Items for checking ARP packets based on binding entries are configured.

    By default, the check items consist of IP address, MAC address, and interface number.

    To allow some special ARP packets that match only one or two items in binding entries to pass through, configure the device to check ARP packets according to one or two specified items in binding entries.

    NOTE:

    Check items configured for ARP packet check based on binding entries do not take effect on hosts that are configured with static binding entries. These hosts check ARP packets based on all items in static binding entries.

  5. Run commit

    The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100074765

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