User’s Manual of FGSD-1022 Series
146
4.14 DHCP Relay & Option 82
The Relay Agent Information option (Option82) is inserted by the DHCP relay agent when forwarding client-originated
DHCP packets to a DHCP server (RFC 3046). Servers recognizing the Relay Agent Information option may use the
information to implement IP address or other parameter assignment policies.
The DHCP Relay can forward the DHCP broadcast packets to a DHCP server in a different subnet (RFC 1542). So DHCP
server can provide IP addresses to clients spanning multiple subnets instead of deploying a DHCP server on every subnet.
Configuring DHCP Relay & Option82
To configure DHCP Option82
1. Enable global option82 function: select DHCP Option82 enable "Enable".
2. Enable port option82 function: select Option82 checkbox for special port.
3. Select DHCP Router Port.
4. Click Apply.
To configure DHCP Relay
5. Enable global Relay function: select DHCP Relay enable "Enable".
6. Enable port Relay function: Type the IP addresses of the DHCP "Relay IP".
7. DHCP Server offers an IP address to client from its list of scopes, which subnet is same as the Relay IP.
8. Select DHCP Router Port.
9. Click Apply.
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