Checking The Configuration - Huawei Quidway S9300 Configuration Manual

2 DHCP Snooping Configuration
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface interface-type interface-number
The interface view is displayed.
The interface is the user-side interface.
Step 3 Run:
dhcp option82 insert enable
The Option 82 is appended to DHCP messages.
Or, run:
dhcp option82 rebuild enable
The Option 82 is forcibly appended to DHCP messages.
l
l
Step 4 Run:
quit
Quit the interface view.
Step 5 (Optional) Run:
dhcp option82 [ circuit-id | remote-id ] format { default | common | extend | user-
defined text }
The format of the Option 82 field is set.
----End

2.5.6 Checking the Configuration

Prerequisite
The configurations of preventing the attacker from sending bogus DHCP messages for extending
IP address leases are complete.
2-14
After the dhcp option82 insert enable command is used, the Option 82 is appended to DHCP
messages if original DHCP messages do not carry the Option 82 field; the suboption 9 field,
that is, information about the MAC address and interface of the device, is appended to DHCP
messages if original DHCP messages carry the Option 82 field.
After the dhcp option82 rebuild enable command is used, the Option 82 field is appended
to DHCP messages if original DHCP messages do not carry the Option 82 field; the original
Option 82 field is removed and a new one is appended if the original DHCP messages carry
the Option 82 field.
NOTE
If the user-defined format of the Option 82 field is used, it is recommended that you specify the interface
type, interface number, and slot ID in text.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Quidway S9300 Terabit Routing Switch
Configuration Guide - Security
Issue 01 (2009-07-28)