diff --git a/lib/ansible/modules/network/fortios/fortios_system_dhcp6_server.py b/lib/ansible/modules/network/fortios/fortios_system_dhcp6_server.py
new file mode 100644
index 00000000000..8a4c9daba41
--- /dev/null
+++ b/lib/ansible/modules/network/fortios/fortios_system_dhcp6_server.py
@@ -0,0 +1,494 @@
+#!/usr/bin/python
+from __future__ import (absolute_import, division, print_function)
+# Copyright 2019 Fortinet, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+__metaclass__ = type
+
+ANSIBLE_METADATA = {'status': ['preview'],
+                    'supported_by': 'community',
+                    'metadata_version': '1.1'}
+
+DOCUMENTATION = '''
+---
+module: fortios_system_dhcp6_server
+short_description: Configure DHCPv6 servers in Fortinet's FortiOS and FortiGate.
+description:
+    - This module is able to configure a FortiGate or FortiOS device by allowing the
+      user to set and modify system_dhcp6 feature and server category.
+      Examples include all parameters and values need to be adjusted to datasources before usage.
+      Tested with FOS v6.0.5
+version_added: "2.9"
+author:
+    - Miguel Angel Munoz (@mamunozgonzalez)
+    - Nicolas Thomas (@thomnico)
+notes:
+    - Requires fortiosapi library developed by Fortinet
+    - Run as a local_action in your playbook
+requirements:
+    - fortiosapi>=0.9.8
+options:
+    host:
+        description:
+            - FortiOS or FortiGate IP address.
+        type: str
+        required: false
+    username:
+        description:
+            - FortiOS or FortiGate username.
+        type: str
+        required: false
+    password:
+        description:
+            - FortiOS or FortiGate password.
+        type: str
+        default: ""
+    vdom:
+        description:
+            - Virtual domain, among those defined previously. A vdom is a
+              virtual instance of the FortiGate that can be configured and
+              used as a different unit.
+        type: str
+        default: root
+    https:
+        description:
+            - Indicates if the requests towards FortiGate must use HTTPS protocol.
+        type: bool
+        default: true
+    ssl_verify:
+        description:
+            - Ensures FortiGate certificate must be verified by a proper CA.
+        type: bool
+        default: true
+    state:
+        description:
+            - Indicates whether to create or remove the object.
+        type: str
+        choices:
+            - present
+            - absent
+    system_dhcp6_server:
+        description:
+            - Configure DHCPv6 servers.
+        default: null
+        type: dict
+        suboptions:
+            dns_search_list:
+                description:
+                    - DNS search list options.
+                type: str
+                choices:
+                    - delegated
+                    - specify
+            dns_server1:
+                description:
+                    - DNS server 1.
+                type: str
+            dns_server2:
+                description:
+                    - DNS server 2.
+                type: str
+            dns_server3:
+                description:
+                    - DNS server 3.
+                type: str
+            dns_service:
+                description:
+                    -  Options for assigning DNS servers to DHCPv6 clients.
+                type: str
+                choices:
+                    - delegated
+                    - default
+                    - specify
+            domain:
+                description:
+                    - Domain name suffix for the IP addresses that the DHCP server assigns to clients.
+                type: str
+            id:
+                description:
+                    - ID.
+                required: true
+                type: int
+            interface:
+                description:
+                    - DHCP server can assign IP configurations to clients connected to this interface. Source system.interface.name.
+                type: str
+            ip_mode:
+                description:
+                    - Method used to assign client IP.
+                type: str
+                choices:
+                    - range
+                    - delegated
+            ip_range:
+                description:
+                    - DHCP IP range configuration.
+                type: list
+                suboptions:
+                    end_ip:
+                        description:
+                            - End of IP range.
+                        type: str
+                    id:
+                        description:
+                            - ID.
+                        required: true
+                        type: int
+                    start_ip:
+                        description:
+                            - Start of IP range.
+                        type: str
+            lease_time:
+                description:
+                    - Lease time in seconds, 0 means unlimited.
+                type: int
+            option1:
+                description:
+                    - Option 1.
+                type: str
+            option2:
+                description:
+                    - Option 2.
+                type: str
+            option3:
+                description:
+                    - Option 3.
+                type: str
+            prefix_range:
+                description:
+                    - DHCP prefix configuration.
+                type: list
+                suboptions:
+                    end_prefix:
+                        description:
+                            - End of prefix range.
+                        type: str
+                    id:
+                        description:
+                            - ID.
+                        required: true
+                        type: int
+                    prefix_length:
+                        description:
+                            - Prefix length.
+                        type: int
+                    start_prefix:
+                        description:
+                            - Start of prefix range.
+                        type: str
+            rapid_commit:
+                description:
+                    - Enable/disable allow/disallow rapid commit.
+                type: str
+                choices:
+                    - disable
+                    - enable
+            status:
+                description:
+                    - Enable/disable this DHCPv6 configuration.
+                type: str
+                choices:
+                    - disable
+                    - enable
+            subnet:
+                description:
+                    - Subnet or subnet-id if the IP mode is delegated.
+                type: str
+            upstream_interface:
+                description:
+                    - Interface name from where delegated information is provided. Source system.interface.name.
+                type: str
+'''
+
+EXAMPLES = '''
+- hosts: localhost
+  vars:
+   host: "192.168.122.40"
+   username: "admin"
+   password: ""
+   vdom: "root"
+   ssl_verify: "False"
+  tasks:
+  - name: Configure DHCPv6 servers.
+    fortios_system_dhcp6_server:
+      host:  "{{ host }}"
+      username: "{{ username }}"
+      password: "{{ password }}"
+      vdom:  "{{ vdom }}"
+      https: "False"
+      state: "present"
+      system_dhcp6_server:
+        dns_search_list: "delegated"
+        dns_server1: "<your_own_value>"
+        dns_server2: "<your_own_value>"
+        dns_server3: "<your_own_value>"
+        dns_service: "delegated"
+        domain: "<your_own_value>"
+        id:  "9"
+        interface: "<your_own_value> (source system.interface.name)"
+        ip_mode: "range"
+        ip_range:
+         -
+            end_ip: "<your_own_value>"
+            id:  "14"
+            start_ip: "<your_own_value>"
+        lease_time: "16"
+        option1: "<your_own_value>"
+        option2: "<your_own_value>"
+        option3: "<your_own_value>"
+        prefix_range:
+         -
+            end_prefix: "<your_own_value>"
+            id:  "22"
+            prefix_length: "23"
+            start_prefix: "<your_own_value>"
+        rapid_commit: "disable"
+        status: "disable"
+        subnet: "<your_own_value>"
+        upstream_interface: "<your_own_value> (source system.interface.name)"
+'''
+
+RETURN = '''
+build:
+  description: Build number of the fortigate image
+  returned: always
+  type: str
+  sample: '1547'
+http_method:
+  description: Last method used to provision the content into FortiGate
+  returned: always
+  type: str
+  sample: 'PUT'
+http_status:
+  description: Last result given by FortiGate on last operation applied
+  returned: always
+  type: str
+  sample: "200"
+mkey:
+  description: Master key (id) used in the last call to FortiGate
+  returned: success
+  type: str
+  sample: "id"
+name:
+  description: Name of the table used to fulfill the request
+  returned: always
+  type: str
+  sample: "urlfilter"
+path:
+  description: Path of the table used to fulfill the request
+  returned: always
+  type: str
+  sample: "webfilter"
+revision:
+  description: Internal revision number
+  returned: always
+  type: str
+  sample: "17.0.2.10658"
+serial:
+  description: Serial number of the unit
+  returned: always
+  type: str
+  sample: "FGVMEVYYQT3AB5352"
+status:
+  description: Indication of the operation's result
+  returned: always
+  type: str
+  sample: "success"
+vdom:
+  description: Virtual domain used
+  returned: always
+  type: str
+  sample: "root"
+version:
+  description: Version of the FortiGate
+  returned: always
+  type: str
+  sample: "v5.6.3"
+
+'''
+
+from ansible.module_utils.basic import AnsibleModule
+from ansible.module_utils.connection import Connection
+from ansible.module_utils.network.fortios.fortios import FortiOSHandler
+from ansible.module_utils.network.fortimanager.common import FAIL_SOCKET_MSG
+
+
+def login(data, fos):
+    host = data['host']
+    username = data['username']
+    password = data['password']
+    ssl_verify = data['ssl_verify']
+
+    fos.debug('on')
+    if 'https' in data and not data['https']:
+        fos.https('off')
+    else:
+        fos.https('on')
+
+    fos.login(host, username, password, verify=ssl_verify)
+
+
+def filter_system_dhcp6_server_data(json):
+    option_list = ['dns_search_list', 'dns_server1', 'dns_server2',
+                   'dns_server3', 'dns_service', 'domain',
+                   'id', 'interface', 'ip_mode',
+                   'ip_range', 'lease_time', 'option1',
+                   'option2', 'option3', 'prefix_range',
+                   'rapid_commit', 'status', 'subnet',
+                   'upstream_interface']
+    dictionary = {}
+
+    for attribute in option_list:
+        if attribute in json and json[attribute] is not None:
+            dictionary[attribute] = json[attribute]
+
+    return dictionary
+
+
+def underscore_to_hyphen(data):
+    if isinstance(data, list):
+        for elem in data:
+            elem = underscore_to_hyphen(elem)
+    elif isinstance(data, dict):
+        new_data = {}
+        for k, v in data.items():
+            new_data[k.replace('_', '-')] = underscore_to_hyphen(v)
+        data = new_data
+
+    return data
+
+
+def system_dhcp6_server(data, fos):
+    vdom = data['vdom']
+    state = data['state']
+    system_dhcp6_server_data = data['system_dhcp6_server']
+    filtered_data = underscore_to_hyphen(filter_system_dhcp6_server_data(system_dhcp6_server_data))
+
+    if state == "present":
+        return fos.set('system.dhcp6',
+                       'server',
+                       data=filtered_data,
+                       vdom=vdom)
+
+    elif state == "absent":
+        return fos.delete('system.dhcp6',
+                          'server',
+                          mkey=filtered_data['id'],
+                          vdom=vdom)
+
+
+def is_successful_status(status):
+    return status['status'] == "success" or \
+        status['http_method'] == "DELETE" and status['http_status'] == 404
+
+
+def fortios_system_dhcp6(data, fos):
+
+    if data['system_dhcp6_server']:
+        resp = system_dhcp6_server(data, fos)
+
+    return not is_successful_status(resp), \
+        resp['status'] == "success", \
+        resp
+
+
+def main():
+    fields = {
+        "host": {"required": False, "type": "str"},
+        "username": {"required": False, "type": "str"},
+        "password": {"required": False, "type": "str", "no_log": True},
+        "vdom": {"required": False, "type": "str", "default": "root"},
+        "https": {"required": False, "type": "bool", "default": True},
+        "ssl_verify": {"required": False, "type": "bool", "default": True},
+        "state": {"required": True, "type": "str",
+                  "choices": ["present", "absent"]},
+        "system_dhcp6_server": {
+            "required": False, "type": "dict", "default": None,
+            "options": {
+                "dns_search_list": {"required": False, "type": "str",
+                                    "choices": ["delegated", "specify"]},
+                "dns_server1": {"required": False, "type": "str"},
+                "dns_server2": {"required": False, "type": "str"},
+                "dns_server3": {"required": False, "type": "str"},
+                "dns_service": {"required": False, "type": "str",
+                                "choices": ["delegated", "default", "specify"]},
+                "domain": {"required": False, "type": "str"},
+                "id": {"required": True, "type": "int"},
+                "interface": {"required": False, "type": "str"},
+                "ip_mode": {"required": False, "type": "str",
+                            "choices": ["range", "delegated"]},
+                "ip_range": {"required": False, "type": "list",
+                             "options": {
+                                 "end_ip": {"required": False, "type": "str"},
+                                 "id": {"required": True, "type": "int"},
+                                 "start_ip": {"required": False, "type": "str"}
+                             }},
+                "lease_time": {"required": False, "type": "int"},
+                "option1": {"required": False, "type": "str"},
+                "option2": {"required": False, "type": "str"},
+                "option3": {"required": False, "type": "str"},
+                "prefix_range": {"required": False, "type": "list",
+                                 "options": {
+                                     "end_prefix": {"required": False, "type": "str"},
+                                     "id": {"required": True, "type": "int"},
+                                     "prefix_length": {"required": False, "type": "int"},
+                                     "start_prefix": {"required": False, "type": "str"}
+                                 }},
+                "rapid_commit": {"required": False, "type": "str",
+                                 "choices": ["disable", "enable"]},
+                "status": {"required": False, "type": "str",
+                           "choices": ["disable", "enable"]},
+                "subnet": {"required": False, "type": "str"},
+                "upstream_interface": {"required": False, "type": "str"}
+
+            }
+        }
+    }
+
+    module = AnsibleModule(argument_spec=fields,
+                           supports_check_mode=False)
+
+    legacy_mode = 'host' in module.params and module.params['host'] is not None and \
+                  'username' in module.params and module.params['username'] is not None and \
+                  'password' in module.params and module.params['password'] is not None
+
+    if not legacy_mode:
+        if module._socket_path:
+            connection = Connection(module._socket_path)
+            fos = FortiOSHandler(connection)
+
+            is_error, has_changed, result = fortios_system_dhcp6(module.params, fos)
+        else:
+            module.fail_json(**FAIL_SOCKET_MSG)
+    else:
+        try:
+            from fortiosapi import FortiOSAPI
+        except ImportError:
+            module.fail_json(msg="fortiosapi module is required")
+
+        fos = FortiOSAPI()
+
+        login(module.params, fos)
+        is_error, has_changed, result = fortios_system_dhcp6(module.params, fos)
+        fos.logout()
+
+    if not is_error:
+        module.exit_json(changed=has_changed, meta=result)
+    else:
+        module.fail_json(msg="Error in repo", meta=result)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/test/units/modules/network/fortios/test_fortios_system_dhcp6_server.py b/test/units/modules/network/fortios/test_fortios_system_dhcp6_server.py
new file mode 100644
index 00000000000..3ce46e1ccd1
--- /dev/null
+++ b/test/units/modules/network/fortios/test_fortios_system_dhcp6_server.py
@@ -0,0 +1,359 @@
+# Copyright 2019 Fortinet, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <https://www.gnu.org/licenses/>.
+
+# Make coding more python3-ish
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import json
+import pytest
+from mock import ANY
+from ansible.module_utils.network.fortios.fortios import FortiOSHandler
+
+try:
+    from ansible.modules.network.fortios import fortios_system_dhcp6_server
+except ImportError:
+    pytest.skip("Could not load required modules for testing", allow_module_level=True)
+
+
+@pytest.fixture(autouse=True)
+def connection_mock(mocker):
+    connection_class_mock = mocker.patch('ansible.modules.network.fortios.fortios_system_dhcp6_server.Connection')
+    return connection_class_mock
+
+
+fos_instance = FortiOSHandler(connection_mock)
+
+
+def test_system_dhcp6_server_creation(mocker):
+    schema_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.schema')
+
+    set_method_result = {'status': 'success', 'http_method': 'POST', 'http_status': 200}
+    set_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.set', return_value=set_method_result)
+
+    input_data = {
+        'username': 'admin',
+        'state': 'present',
+        'system_dhcp6_server': {
+            'dns_search_list': 'delegated',
+            'dns_server1': 'test_value_4',
+            'dns_server2': 'test_value_5',
+            'dns_server3': 'test_value_6',
+            'dns_service': 'delegated',
+            'domain': 'test_value_8',
+            'id': '9',
+            'interface': 'test_value_10',
+            'ip_mode': 'range',
+            'lease_time': '12',
+            'option1': 'test_value_13',
+            'option2': 'test_value_14',
+            'option3': 'test_value_15',
+            'rapid_commit': 'disable',
+            'status': 'disable',
+            'subnet': 'test_value_18',
+            'upstream_interface': 'test_value_19'
+        },
+        'vdom': 'root'}
+
+    is_error, changed, response = fortios_system_dhcp6_server.fortios_system_dhcp6(input_data, fos_instance)
+
+    expected_data = {
+        'dns-search-list': 'delegated',
+        'dns-server1': 'test_value_4',
+        'dns-server2': 'test_value_5',
+        'dns-server3': 'test_value_6',
+        'dns-service': 'delegated',
+        'domain': 'test_value_8',
+        'id': '9',
+        'interface': 'test_value_10',
+        'ip-mode': 'range',
+        'lease-time': '12',
+        'option1': 'test_value_13',
+        'option2': 'test_value_14',
+        'option3': 'test_value_15',
+        'rapid-commit': 'disable',
+        'status': 'disable',
+        'subnet': 'test_value_18',
+        'upstream-interface': 'test_value_19'
+    }
+
+    set_method_mock.assert_called_with('system.dhcp6', 'server', data=expected_data, vdom='root')
+    schema_method_mock.assert_not_called()
+    assert not is_error
+    assert changed
+    assert response['status'] == 'success'
+    assert response['http_status'] == 200
+
+
+def test_system_dhcp6_server_creation_fails(mocker):
+    schema_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.schema')
+
+    set_method_result = {'status': 'error', 'http_method': 'POST', 'http_status': 500}
+    set_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.set', return_value=set_method_result)
+
+    input_data = {
+        'username': 'admin',
+        'state': 'present',
+        'system_dhcp6_server': {
+            'dns_search_list': 'delegated',
+            'dns_server1': 'test_value_4',
+            'dns_server2': 'test_value_5',
+            'dns_server3': 'test_value_6',
+            'dns_service': 'delegated',
+            'domain': 'test_value_8',
+            'id': '9',
+            'interface': 'test_value_10',
+            'ip_mode': 'range',
+            'lease_time': '12',
+            'option1': 'test_value_13',
+            'option2': 'test_value_14',
+            'option3': 'test_value_15',
+            'rapid_commit': 'disable',
+            'status': 'disable',
+            'subnet': 'test_value_18',
+            'upstream_interface': 'test_value_19'
+        },
+        'vdom': 'root'}
+
+    is_error, changed, response = fortios_system_dhcp6_server.fortios_system_dhcp6(input_data, fos_instance)
+
+    expected_data = {
+        'dns-search-list': 'delegated',
+        'dns-server1': 'test_value_4',
+        'dns-server2': 'test_value_5',
+        'dns-server3': 'test_value_6',
+        'dns-service': 'delegated',
+        'domain': 'test_value_8',
+        'id': '9',
+        'interface': 'test_value_10',
+        'ip-mode': 'range',
+        'lease-time': '12',
+        'option1': 'test_value_13',
+        'option2': 'test_value_14',
+        'option3': 'test_value_15',
+        'rapid-commit': 'disable',
+        'status': 'disable',
+        'subnet': 'test_value_18',
+        'upstream-interface': 'test_value_19'
+    }
+
+    set_method_mock.assert_called_with('system.dhcp6', 'server', data=expected_data, vdom='root')
+    schema_method_mock.assert_not_called()
+    assert is_error
+    assert not changed
+    assert response['status'] == 'error'
+    assert response['http_status'] == 500
+
+
+def test_system_dhcp6_server_removal(mocker):
+    schema_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.schema')
+
+    delete_method_result = {'status': 'success', 'http_method': 'POST', 'http_status': 200}
+    delete_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.delete', return_value=delete_method_result)
+
+    input_data = {
+        'username': 'admin',
+        'state': 'absent',
+        'system_dhcp6_server': {
+            'dns_search_list': 'delegated',
+            'dns_server1': 'test_value_4',
+            'dns_server2': 'test_value_5',
+            'dns_server3': 'test_value_6',
+            'dns_service': 'delegated',
+            'domain': 'test_value_8',
+            'id': '9',
+            'interface': 'test_value_10',
+            'ip_mode': 'range',
+            'lease_time': '12',
+            'option1': 'test_value_13',
+            'option2': 'test_value_14',
+            'option3': 'test_value_15',
+            'rapid_commit': 'disable',
+            'status': 'disable',
+            'subnet': 'test_value_18',
+            'upstream_interface': 'test_value_19'
+        },
+        'vdom': 'root'}
+
+    is_error, changed, response = fortios_system_dhcp6_server.fortios_system_dhcp6(input_data, fos_instance)
+
+    delete_method_mock.assert_called_with('system.dhcp6', 'server', mkey=ANY, vdom='root')
+    schema_method_mock.assert_not_called()
+    assert not is_error
+    assert changed
+    assert response['status'] == 'success'
+    assert response['http_status'] == 200
+
+
+def test_system_dhcp6_server_deletion_fails(mocker):
+    schema_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.schema')
+
+    delete_method_result = {'status': 'error', 'http_method': 'POST', 'http_status': 500}
+    delete_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.delete', return_value=delete_method_result)
+
+    input_data = {
+        'username': 'admin',
+        'state': 'absent',
+        'system_dhcp6_server': {
+            'dns_search_list': 'delegated',
+            'dns_server1': 'test_value_4',
+            'dns_server2': 'test_value_5',
+            'dns_server3': 'test_value_6',
+            'dns_service': 'delegated',
+            'domain': 'test_value_8',
+            'id': '9',
+            'interface': 'test_value_10',
+            'ip_mode': 'range',
+            'lease_time': '12',
+            'option1': 'test_value_13',
+            'option2': 'test_value_14',
+            'option3': 'test_value_15',
+            'rapid_commit': 'disable',
+            'status': 'disable',
+            'subnet': 'test_value_18',
+            'upstream_interface': 'test_value_19'
+        },
+        'vdom': 'root'}
+
+    is_error, changed, response = fortios_system_dhcp6_server.fortios_system_dhcp6(input_data, fos_instance)
+
+    delete_method_mock.assert_called_with('system.dhcp6', 'server', mkey=ANY, vdom='root')
+    schema_method_mock.assert_not_called()
+    assert is_error
+    assert not changed
+    assert response['status'] == 'error'
+    assert response['http_status'] == 500
+
+
+def test_system_dhcp6_server_idempotent(mocker):
+    schema_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.schema')
+
+    set_method_result = {'status': 'error', 'http_method': 'DELETE', 'http_status': 404}
+    set_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.set', return_value=set_method_result)
+
+    input_data = {
+        'username': 'admin',
+        'state': 'present',
+        'system_dhcp6_server': {
+            'dns_search_list': 'delegated',
+            'dns_server1': 'test_value_4',
+            'dns_server2': 'test_value_5',
+            'dns_server3': 'test_value_6',
+            'dns_service': 'delegated',
+            'domain': 'test_value_8',
+            'id': '9',
+            'interface': 'test_value_10',
+            'ip_mode': 'range',
+            'lease_time': '12',
+            'option1': 'test_value_13',
+            'option2': 'test_value_14',
+            'option3': 'test_value_15',
+            'rapid_commit': 'disable',
+            'status': 'disable',
+            'subnet': 'test_value_18',
+            'upstream_interface': 'test_value_19'
+        },
+        'vdom': 'root'}
+
+    is_error, changed, response = fortios_system_dhcp6_server.fortios_system_dhcp6(input_data, fos_instance)
+
+    expected_data = {
+        'dns-search-list': 'delegated',
+        'dns-server1': 'test_value_4',
+        'dns-server2': 'test_value_5',
+        'dns-server3': 'test_value_6',
+        'dns-service': 'delegated',
+        'domain': 'test_value_8',
+        'id': '9',
+        'interface': 'test_value_10',
+        'ip-mode': 'range',
+        'lease-time': '12',
+        'option1': 'test_value_13',
+        'option2': 'test_value_14',
+        'option3': 'test_value_15',
+        'rapid-commit': 'disable',
+        'status': 'disable',
+        'subnet': 'test_value_18',
+        'upstream-interface': 'test_value_19'
+    }
+
+    set_method_mock.assert_called_with('system.dhcp6', 'server', data=expected_data, vdom='root')
+    schema_method_mock.assert_not_called()
+    assert not is_error
+    assert not changed
+    assert response['status'] == 'error'
+    assert response['http_status'] == 404
+
+
+def test_system_dhcp6_server_filter_foreign_attributes(mocker):
+    schema_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.schema')
+
+    set_method_result = {'status': 'success', 'http_method': 'POST', 'http_status': 200}
+    set_method_mock = mocker.patch('ansible.module_utils.network.fortios.fortios.FortiOSHandler.set', return_value=set_method_result)
+
+    input_data = {
+        'username': 'admin',
+        'state': 'present',
+        'system_dhcp6_server': {
+            'random_attribute_not_valid': 'tag',
+            'dns_search_list': 'delegated',
+            'dns_server1': 'test_value_4',
+            'dns_server2': 'test_value_5',
+            'dns_server3': 'test_value_6',
+            'dns_service': 'delegated',
+            'domain': 'test_value_8',
+            'id': '9',
+            'interface': 'test_value_10',
+            'ip_mode': 'range',
+            'lease_time': '12',
+            'option1': 'test_value_13',
+            'option2': 'test_value_14',
+            'option3': 'test_value_15',
+            'rapid_commit': 'disable',
+            'status': 'disable',
+            'subnet': 'test_value_18',
+            'upstream_interface': 'test_value_19'
+        },
+        'vdom': 'root'}
+
+    is_error, changed, response = fortios_system_dhcp6_server.fortios_system_dhcp6(input_data, fos_instance)
+
+    expected_data = {
+        'dns-search-list': 'delegated',
+        'dns-server1': 'test_value_4',
+        'dns-server2': 'test_value_5',
+        'dns-server3': 'test_value_6',
+        'dns-service': 'delegated',
+        'domain': 'test_value_8',
+        'id': '9',
+        'interface': 'test_value_10',
+        'ip-mode': 'range',
+        'lease-time': '12',
+        'option1': 'test_value_13',
+        'option2': 'test_value_14',
+        'option3': 'test_value_15',
+        'rapid-commit': 'disable',
+        'status': 'disable',
+        'subnet': 'test_value_18',
+        'upstream-interface': 'test_value_19'
+    }
+
+    set_method_mock.assert_called_with('system.dhcp6', 'server', data=expected_data, vdom='root')
+    schema_method_mock.assert_not_called()
+    assert not is_error
+    assert changed
+    assert response['status'] == 'success'
+    assert response['http_status'] == 200