QTech QSW-2800 series Configuration Manual - 28.7 Dhcpv6 Troubleshooting
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28.7 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.