ATEN ES0152 User Manual page 273

Chapter 11. DHCP
on: Enable DHCP relay mode operation. When DHCP relay mode operation is
enabled, the agent forwards and transfers DHCP messages between the clients
and the server when they are not in the same subnet domain. And the DHCP
broadcast message won't be flooded for security considerations.
off: Disable DHCP relay mode operation.
Relay Server:
Indicates the DHCP relay server IP address.
Relay Information Mode:
Indicates the DHCP relay information mode option operation. The option 82
circuit ID format as "[vlan_id][module_id][port_no]". The first four characters
represent the VLAN ID, the fifth and sixth characters are the module ID(in
standalone device it always equal 0, in stackable device it means switch ID),
and the last two characters are the port number. For example, "00030108"
means the DHCP message receive form VLAN ID 3, switch ID 1, port No 8.
And the option 82 remote ID value is equal the switch MAC address.
Possible modes are:
Enabled: Enable DHCP relay information mode operation. When DHCP relay
information mode operation is enabled, the agent inserts specific information
(option 82) into a DHCP message when forwarding to DHCP server and
removes it from a DHCP message when transferring to DHCP client. It only
works when DHCP relay operation mode is enabled.
Disabled: Disable DHCP relay information mode operation.
Relay Information Policy:
Indicates the DHCP relay information option policy. When DHCP relay
information mode operation is enabled, if the agent receives a DHCP message
that already contains relay agent information it will enforce the policy. The
'Replace' policy is invalid when relay information mode is disabled. Possible
policies are:
Replace: Replace the original relay information when a DHCP message that
already contains it is received.
Keep: Keep the original relay information when a DHCP message that already
contains it is received.
Drop: Drop the package when a DHCP message that already contains relay
information is received.
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