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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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Typical Application of the Option 82 Field

Typical Application of the Option 82 Field

The DHCP Relay Agent Information Option (Option 82) field records the location of a DHCP client. A DHCP snooping-enabled device or a DHCP relay agent inserts the Option 82 field to a DHCP Request message to notify the DHCP server of the DHCP client location. Based on the Option 82 field, the DHCP server can properly assign an IP address and other configurations to the DHCP client, ensuring DHCP client security.

Figure 13-5 Networking diagram of the Option 82 field

In Figure 13-5, the clients use the DHCP to obtain IP addresses. To improve network security, the administrator configures the device to control network access of clients connected to Interface1.

The DHCP server cannot detect the DHCP client location based only on the DHCP Request message. As a result, users in the same VLAN have the same rights to access network resources.

To address this problem, the administrator can enable the Option 82 field after DHCP snooping is enabled on SwitchA. Upon receiving a DHCP Request message to apply for an IP address, SwitchA inserts the Option 82 field in the message to notify the DHCP server of the DHCP client location, including the MAC address, VLAN ID, and interface number of the client. The DHCP server can properly assign an IP address and other configurations to the client based on the IP address assignment or security policies on the server.
NOTE:

The Option 82 field records the location of a DHCP client and is encapsulated in a DHCP Request message that is sent to the DHCP server. To deploy different IP addresses or security policies for different clients, the DHCP server must support the Option 82 field and be configured with IP address assignment or security policies.

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Updated: 2019-04-20

Document ID: EDOC1100074765

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