QTECH QSW-3400 Инструкция по настройке - Manual (Page 243)

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30.7 DHCPv6 Troubleshooting
If the DHCPv6 clients cannot obtain IPv6 addresses and other network parameters, the
following procedures can be followed when DHCPv6 client hardware and cables have been
verified ok:

Verify the DHCPv6 server is running, start the related DHCP v6 server function if not
running;

If the DHCPv6 clients and servers are not in the same physical network, verify the
router responsible for DHCPv6 packet forwarding has DHCPv6 relay function. If
DHCPv6 relay is not available for the intermediate router, it is recommended to replace
the router or upgrade its software to one that has a DHCPv6 relay function;

Sometimes hosts are connected to the DHCPv6 enabled switches, but can not get
IPv6 addresses. In this situation, it should be checked first whether the ports which the
hosts are connected to, are connected with the port which the DHCPv6 server is
connected to. If connected directly, it should be checked then whether the IPv6
address pool of the VLAN which the port belongs to, is in the same subnet with the
address pool configure in the DHCPv6 server; If not connected directly, and any layer
three DHCPv6 relay is configured between the hosts and the DHCPv6 server, it should
be checked first whether an valid IPv6 address has been configured for the switch
interface which the hosts are connected to. If not configured, configure an valid IPv6
address. If configured, it should be checked whether the configured IPv6 address is in
the same subnet with the DHCPv6 server. If not, please add it to the address pool.