Siemens S223 User Manual

User Manual                                                                               UMN:CLI 
SURPASS hiD 6615 S223/S323 R1.5 

A50010-Y3-C150-2-7619                                                                         253 

By using the agent-supplied remote ID option, the untrusted and as-yet unstandardized 
client identifier field need not be used by the DHCP server. 
 

Fig. 8.33 shows how the DHCP relay agent with the DHCP option 82 operates. 

1. DHCP Request

2. DHCP Request + Option 82

3. DHCP Response + Option 82

4. DHCP Response

 

DHCP Option 82 Operation 

 

To enable/disable the DHCP option 82, use the following command. 

Enables the system to add the DHCP option 82 field. 

Global 

Disables the system to add the DHCP option 82 field. 

 

The DHCP option 82 enables a DHCP relay agent to include information about itself when 
forwarding client-originated DHCP packets to a DHCP server. The DHCP server can use 
this information to implement security and IP address assignment policies. 

There are 2 sub-options for the DHCP option 82 information as follows: 

•

 

 

 

This sub-option may be added by DHCP relay agents which terminate switched or 

 

permanent circuits and have mechanisms to identify the remote host of the circuit. 

 

Note that, the remote ID must be globally unique. 

•

 

 

 

This sub-option may be added by DHCP relay agents which terminate switched or 

 

permanent circuits. It encodes an agent-local identifier of the circuit from which a 

 

DHCP client-to-server packet was received. It is intended for use by DHCP relay 

 

agents in forwarding DHCP responses back to the proper circuit.