Comtrol ES7510 - Manual (Page 47)

RocketLinx ES7510 User Guide: 2000544 Rev. B DHCP Relay Agent - 47
Configuration Using the Web Interface
DHCP Relay Agent
This subsection discusses the DHCP Relay Agent.
DHCP Relay Agent Page
Relay Agent
You can select to Enable or Disable DHCP relay agent function, and then select the
modification type of option 82 field.
The DHCP Information option referred to as Option 82 is normally used in
environments of large enterprise or metro networks to provide additional data on the
physical attachment of the client. Option 82 is suggested for use in distributed DHCP
server/relay environments, where relays insert additional information to identify the
client’s attachment point.
Relay Policy
Relay policy drop: Drops the Option 82 field and does not add any option 82 fields.
Relay policy keep: Keeps the original Option 82 field and forwards it to the server.
Relay policy replace: (Default setting), replaces the existing option 82 field and
adds the new Option 82 field.
Helper Address
There are four fields for the DHCP server’s IP address. You can fill the field with a
preferred IP address of the DHCP Server. All of the DHCP packets from the client are
modified by the policy and forwarded to the DHCP server through the gateway port.