Dhcpv6 Relay - ZyXEL Communications 43222612 User Manual

Table of Contents

Chapter 44 DHCP

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.

GS2220 Series User's Guide