Chapter 44 DHCP
GS2220 Series User’s Guide
380
Figure 290
DHCP Relay for Two VLANs
For the example network, configure the
VLAN Setting
screen as shown.
Figure 291
DHCP Relay for Two VLANs Configuration Example
44.5 DHCPv6 Relay
A DHCPv6 relay agent is on the same network as the DHCPv6 clients and helps forward messages
between the DHCPv6 server and clients. When a client cannot use its link-local address and a well-
known multicast address to locate a DHCPv6 server on its network, it then needs a DHCPv6 relay agent
to send a message to a DHCPv6 server that is not attached to the same network.
The DHCPv6 relay agent can add the remote identification (remote-ID) option and the interface-ID
option to the Relay-Forward DHCPv6 messages. The remote-ID option carries a user-defined string, such
as the system name. The interface-ID option provides slot number, port information and the VLAN ID to
the DHCPv6 server. The remote-ID option (if any) is stripped from the Relay-Reply messages before the
relay agent sends the packets to the clients. The DHCPv6 server copies the interface-ID option from the
Relay-Forward message into the Relay-Reply message and sends it to the relay agent. The interface-ID
should not change even after the relay agent restarts.
VLAN 1
VLAN 2
EXAMPLE
Summary of Contents for GS2220-10
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