D-Link DES-3528 Product Manual - Page 285

DHCP Relay Option 82, State, DHCP Relay Agent, Information Option 82, Check, Policy, Remote ID

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xStack® DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch Web UI Reference Guide given DHCP packet. DHCP Relay Option 82 State This field can be toggled between Enabled and Disabled using the pull-down menu. It is used to enable or disable the DHCP Relay Agent Information Option 82 on the Switch. The default is Disabled. Enabled -When this field is toggled to Enabled, the relay agent will insert and remove DHCP relay information (option 82 field) in messages between DHCP servers and clients. When the relay agent receives the DHCP request, it adds the option 82 information, and the IP address of the relay agent (if the relay agent is configured), to the packet. Once the option 82 information has been added to the packet it is sent on to the DHCP server. When the DHCP server receives the packet, if the server is capable of option 82, it can implement policies like restricting the number of IP addresses that can be assigned to a single remote ID or circuit ID. Then the DHCP server echoes the option 82 field in the DHCP reply. The DHCP server unicasts the reply back to the relay agent if the request was relayed to the server by the relay agent. The Switch verifies that it originally inserted the option 82 data. Finally, the relay agent removes the option 82 field and forwards the packet to the Switch port that connects to the DHCP client that sent the DHCP request. Disabled- When the field is toggled to Disabled, the relay agent will not insert and remove DHCP relay information (option 82 field) in messages between DHCP servers and clients, and the check and policy settings will have no effect. DHCP Relay Agent Information Option 82 Check DHCP Relay Agent Information Option 82 Policy This field can be toggled between Enabled and Disabled using the pull-down menu. It is used to enable or disable the Switch's ability to check the validity of the packet's option 82 field. The default is Disabled. Enabled - When the field is toggled to Enabled, the relay agent will check the validity of the packet's option 82 field. If the Switch receives a packet that contains the option 82 field from a DHCP client, the Switch drops the packet because it is invalid. In packets received from DHCP servers, the relay agent will drop invalid messages. Disabled - When the field is toggled to Disabled, the relay agent will not check the validity of the packet's option 82 field. This field can be toggled between Replace, Drop, and Keep by using the pull-down menu. It is used to set the Switch's policy for handling packets when the DHCP Relay Agent Information Option 82 Check is set to Disabled. The default is Replace. Replace - The option 82 field will be replaced if the option 82 field already exists in the packet received from the DHCP client. Drop - The packet will be dropped if the option 82 field already exists in the packet received from the DHCP client. Keep - The option 82 field will be retained if the option 82 field already exists in the packet received from the DHCP client. DHCP Relay Agent Information Option 82 Remote ID DHCP Relay Option 60 State Enter the DHCP Relay Agent Information Option 82 Remote ID. Tick the Default check box to use MAC address as the Remote ID. Use the drop-down menu to enable or disable the use of the DHCP Relay Option 60 State feature. DHCP Relay Option 61 State Use the drop-down menu to enable or disable the use of the DHCP Relay Option 61 State feature. Click the Apply button to accept the changes made for each individual section. NOTE: If the Switch receives a packet that contains the option 82 field from a DHCP client and the information-checking feature is enabled, the Switch drops the packet because it is invalid. However, in some instances, users may configure a client with the option 82 field. In this situation, disable the information check feature so that the Switch does not remove the option 82 field from the packet. Users may configure the action that the Switch takes when it receives a packet with existing option 82 information by configuring the DHCP Agent Information Option 82 Policy. 276

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xStack® DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch Web UI Reference Guide
given DHCP packet.
DHCP Relay Option 82
State
This field can be toggled between
Enabled
and
Disabled
using the pull-down menu. It
is used to enable or disable the DHCP Relay Agent Information Option 82 on the
Switch. The default is
Disabled.
Enabled
–When this field is toggled to
Enabled
, the relay agent will insert and remove
DHCP relay information (option 82 field) in messages between DHCP servers and
clients. When the relay agent receives the DHCP request, it adds the option 82
information, and the IP address of the relay agent (if the relay agent is configured), to
the packet. Once the option 82 information has been added to the packet it is sent on
to the DHCP server. When the DHCP server receives the packet, if the server is
capable of option 82, it can implement policies like restricting the number of IP
addresses that can be assigned to a single remote ID or circuit ID. Then the DHCP
server echoes the option 82 field in the DHCP reply. The DHCP server unicasts the
reply back to the relay agent if the request was relayed to the server by the relay
agent. The Switch verifies that it originally inserted the option 82 data. Finally, the
relay agent removes the option 82 field and forwards the packet to the Switch port that
connects to the DHCP client that sent the DHCP request.
Disabled-
When the field is toggled to
Disabled
, the relay agent will not insert and
remove DHCP relay information (option 82 field) in messages between DHCP servers
and clients, and the check and policy settings will have no effect.
DHCP Relay Agent
Information Option 82
Check
This field can be toggled between
Enabled
and
Disabled
using the pull-down menu. It
is used to enable or disable the Switch’s ability to check the validity of the packet’s
option 82 field. The default is
Disabled
.
Enabled
– When the field is toggled to
Enabled
, the relay agent will check the validity
of the packet’s option 82 field. If the Switch receives a packet that contains the option
82 field from a DHCP client, the Switch drops the packet because it is invalid. In
packets received from DHCP servers, the relay agent will drop invalid messages.
Disabled
–
When the field is toggled to
Disabled
, the relay agent will not check the
validity of the packet’s option 82 field.
DHCP Relay Agent
Information Option 82
Policy
This field can be toggled between
Replace, Drop,
and
Keep
by using the pull-down
menu.
It is used to set the Switch’s policy for handling packets when the DHCP Relay
Agent Information Option 82 Check
is set to
Disabled
. The default is
Replace.
Replace
– The option 82 field will be replaced if the option 82 field already exists in
the packet received from the DHCP client.
Drop
– The packet will be dropped if the option 82 field already exists in the packet
received from the DHCP client.
Keep
– The option 82 field will be retained if the option 82 field already exists in the
packet received from the DHCP client.
DHCP Relay Agent
Information Option 82
Remote ID
Enter the DHCP Relay Agent Information Option 82 Remote ID. Tick the
Default
check box to use MAC address as the Remote ID.
DHCP Relay Option 60
State
Use the drop-down menu to enable or disable the use of the DHCP Relay Option 60
State feature.
DHCP Relay Option 61
State
Use the drop-down menu to enable or disable the use of the DHCP Relay Option 61
State feature.
Click the
Apply
button to accept the changes made for each individual section.
NOTE:
If the Switch receives a packet that contains the option 82 field from a DHCP client and the
information-checking feature is enabled, the Switch drops the packet because it is invalid.
However, in some instances, users may configure a client with the option 82 field. In this situation,
disable the information check feature so that the Switch does not remove the option 82 field from
the packet. Users may configure the action that the Switch takes when it receives a packet with
existing option 82 information by configuring the DHCP Agent Information Option 82 Policy.
276