PLANET WGSW-52040 - Manual (Page 295)

 Snooping option37,38 can process one of the following operations for DHCPv6
request packets with option37,38: replace the original option37,38 with its own;
discard the packets with option37,38; do not execute adding, discarding or
forwarding operation. Therefore, please check policy configuration of snooping
option37,38 on second device when obtaining the false address or no address is
obtained according to option37,38.
 DHCPv6 server obtains option37,38 of the packets from client by default, if no, it will
obtain option37,38 of the packet sent by relay.
 DHCPv6 server only checks whether the first DHCPv6 relay adds option37,38 that
means only option37,38 of the innermost relay-forw is valid in relay packets.
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