| Description | The article describes how to configure a downstream FortiGate to obtain the IPv6 prefix and DNS from an upstream DHCPv6 server through FortiGate GUI. |
| Scope | |
| Solution |
In this scenario, a DHCPv6 server is connected to FortiGate A via an upstream interface.
In this example, port1 is the upstream interface. FortiGate A is connected to FortiGate B via a downstream interface (port2 in this example).
To configure a downstream FortiGate to obtain the IPv6 prefix and DNS from an upstream DHCPv6 server:
1) Configure the upstream interface:
- On FortiGate A, go to Network -> Interfaces. - Edit port1. - For IPv6 addressing mode, select DHCP. - Enable DHCPv6 prefix delegation. - Select 'OK'.
2) Configure the downstream interface:
- On FortiGate A, edit port2. - Enable DHCPv6 Server. - Set DNS service and IP mode to Delegated. - Enable a Stateful server. - From the Upstream interface dropdown list, select port1. - Select 'OK'.
3) Configure the FortiGate B interface:
- On FortiGate B, go to Network -> Interfaces. - Edit the desired interface. - Set IPv6 addressing mode to DHCP. FortiGate B obtains the IPv6 prefix and DNS from the DHCPv6 server.
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