SFR/RED France FTTH IPv4 & IPv6 & Phone
=======================================

**Original Author:** Philippe Gaultier

**Introduction / Getting ready to make the connection**
-------------------------------------------------------

This guide is for SFR/RED France FTTH using DHCPv4  / DHCPv6 to connect.

The guide deals with internet connection and phone. Support for TV has not been tested.

.. Note::
    Before starting this guide, you should have the MAC address of your SFR/RED Box. In the guide you should replace xx:xx:xx:xx:xx:xx with your SFR/RED Box MAC address.

SFR/RED requires that the WAN interface assignment should look similar to this:

.. image:: images/SFRRED_assignations.png
	:width: 100%

* WAN interface has MAC xx:xx:xx:xx:xx:xx which is the original WAN MAC of the BOX (spoofed),
* LAN interface has MAC 00:11:22:33:44:55 which is the original MAC of the firewall,
* DUID is 00:03:00:01:xx:xx:xx:xx:xx:xx it's derived from the original WAN MAC of the BOX (spoofed).

**Configuring the WAN Interface**
---------------------------------

Select :menuselection:`Interfaces --> [WAN]`

In order to establish the IPv4 and IPv6 connection, SFR/RED requires that the correct parameters are passed for the DHCPv4 and DHCPv6
requests respectively.

Select options:

* IPv4 configuration: DHCPv4,
* IPv6 configuration: DHCPv6.

.. image:: images/SFRRED_WAN_configuration_1.png
	:width: 100%

**On the DHCPv4 request it is a requirement to pass the following:**

.. image:: images/SFRRED_WAN_configuration_2.png
	:width: 100%

.. Note::
    It is necessary to specify the following ”Send Options”:

    * dhcp-class-identifier "neufbox_NB6VAC-FXC"

.. Note::
    It is necessary to specify the following ”Request Options”:

    * subnet-mask, broadcast-address, time-offset, routers, domain-name, domain-name-servers, host-name, ntp-servers, nis-domain, root-path, merit-dump


**On the DHCPv6 request we need to use raw options**

.. image:: images/SFRRED_WAN_configuration_3.png
	:width: 100%

.. Note::
    It is necessary to specify the following ”Send Options”:

    * ia-pd 1, raw-option 16 00:00:a0:0c:00:40:6e:65:75:66:62:6f:78:5f:4e:42:36:56:41:43:2d:46:58:43

.. Note::
    It is necessary to specify the following ”Request Options”:

    * domain-name-servers, domain-name

.. Note::
    Set Identity Association options to:

    * Delegate prefix: checked,
    * id-assoc pd ID: 1,
    * Prefix: ::/0.

    Set Prefix Interface option to:

    * Prefix Interface: 8.

Click ”Save” and then ”Apply”.


**Configuring the LAN Interface**
---------------------------------

Interfaces / Parameters
+++++++++++++++++++++++

Select :menuselection:`Interfaces --> Parameters` and set your DUID.

.. image:: images/SFRRED_interfaces_parameters.png
	:width: 100%

.. Note::
    The DUID is based on the SFR/RED Box MAC address : 00:03:00:01:xx:xx:xx:xx:xx:xx.

Click ”Save” and then ”Apply”

Interfaces / [LAN]
++++++++++++++++++

Select :menuselection:`Interfaces --> [LAN]` and set IPv4 to “Static IPv4” and IPv6 Configuration Type to
“Track Interface”.

.. image:: images/SFRRED_LAN_configuration_1.png
	:width: 100%


And define the IPv6 Prefix ID to ”0”
Finally, set the following parameters as shown:
 * the IPv4 address to the one wanted,
 * the IPv6 interfacet to ”WAN”,
 * the IPv6 Prefix ID to ”0”.


.. image:: images/SFRRED_LAN_configuration_2.png
	:width: 100%

Click ”Save” and then ”Apply”



.. Note::
    It is advisable at this point to reboot the system. This will allow you to retrieve an IPv4 address which will be used in next part.

**Configuring NGINX to provision the SFR/RED BOX**
--------------------------------------------------

In order to set up the phone, as the SIP parameters (user/password) are not public, we will add the SFR/RED box in our LAN.
This will allow us to plug our regular phone in the SFR/RED box.

.. Note::
    This how-to does not cover installation of NGINX nor the use of SSH / shell commands.

First SSH into your OPNSense firewall and create a folder **/srv/sfrredbox**. In this folder, we will add the scripts used to spoof the SFR/RED Box requests.

In this directory create a file **index.php**

.. code-block:: php

    $currentFirewall = 'firewall.localdomain.intra';
    // can probably be replaced with
    // $currentFirewall = exec('hostname');
    if (isset($_GET['ip_dhcp'])) {
        // adjust re0 to your WAN interface
        $_GET['ip_dhcp'] = exec('ifconfig re0 | grep \'inet \' | cut -d\' \' -f2');
        // if the ifconfig command does not work, set the external IP manually
        // $_GET['ip_dhcp'] = 'your.external.ip.address';
    }
    $_SERVER['DOCUMENT_URI'] = str_replace('/index.php', '', $_SERVER['DOCUMENT_URI']);
    $parameters = http_build_query($_GET);
    $url = $_SERVER['REQUEST_SCHEME'].'://'.$_SERVER['HTTP_HOST'].'/'.trim($_SERVER['DOCUMENT_URI'], '/?') .'?'.$parameters;
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADERFUNCTION, 'readHeaderLine');
    $data = curl_exec($ch);
    $data = preg_replace('/<proxy([^>]+)>([^<]+)<\/proxy>/', '<proxy$1>'.$currentFirewall.'</proxy>', $data);
    curl_close($ch);
    header('Content-Length: '.strlen($data));
    header('Content-Type: application/xml');
    echo $data;


.. Warning::
    Code cannot be copied / pasted as-is, you will have to adjust the parameters and make it consistent with your own settings.

Services / Nginx / Configuration
++++++++++++++++++++++++++++++++

Select :menuselection:`Services --> Nginx --> Configuration`

Activate NGINX

.. image:: images/SFRRED_services_nginx_configuration_1.png
	:width: 100%

Services / Nginx / Configuration / HTTP(s)
++++++++++++++++++++++++++++++++++++++++++

Select :menuselection:`Services --> Nginx --> Configuration --> HTTP(s)`

Create a new config

.. image:: images/SFRRED_services_nginx_configuration_2.png
	:width: 100%

.. Note::
    Important settings are:

    * Description,
    * URL Pattern,
    * File System Root,
    * Pass Request To Local PHP Interpreter / Threat Upstream.

Services / Nginx / Configuration / HTTP(s) / URL Rewriting
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Select :menuselection:`Services --> Nginx --> Configuration --> HTTP(s) --> URL Rewriting`

Add a new rewrite rule

.. image:: images/SFRRED_services_nginx_configuration_3.png
	:width: 100%

Services / Nginx / Configuration / HTTP(s) / HTTP Server
++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Select :menuselection:`Services --> Nginx --> Configuration --> HTTP(s) --> HTTP Server`

Add a new rewrite rule

.. image:: images/SFRRED_services_nginx_configuration_4.png
	:width: 100%

.. Note::
    NGINX should be serving the page we have created.


**Configuring Siproxd to provision the SFR/RED BOX**
-----------------------------------------------------

To allow phone to work, the easiest way is to set Siproxd on the firewall.

Services / Unbound DNS / General
++++++++++++++++++++++++++++++++

Select :menuselection:`Services --> Unbound DNS --> General`

Add parameters to let SFR/RED Box discover the SIP proxy:

.. image:: images/SFRRED_services_unbound_configuration_1.png
	:width: 100%

.. Warning::
    It appears OPNSense will drop support of functionnality of **advanced** parameters so I don't know if it will be possible in future releases
    to define the DNS stuff using:

    * local-data: "_sip._udp.firewall.localdomain.intra. 180 IN SRV 10 60 5060  firewall.localdomain.intra."

Services / Siproxd
++++++++++++++++++

Select :menuselection:`Services --> Siproxd`

Define basic parameters:

.. image:: images/SFRRED_services_siproxd_configuration_1.png
	:width: 100%

Services / Siproxd / Outbound Domains
+++++++++++++++++++++++++++++++++++++

Select :menuselection:`Services --> Siproxd --> Outbound Domains`

Create the configuration for outbound domain:

.. image:: images/SFRRED_services_siproxd_configuration_2.png
	:width: 100%

.. Note::
    The IP address and the port of outbound domain was discovered using an **host** request on the proxy returned by SFR/RED while provisionning the box.
    You will have to check the <proxy></proxy> fields of **voip2.xml**.

    .. highlights::
        host -t SRV _sip._udp.residential.p-cscf.sfr.net

.. Note::
    the host request result gives available SIP servers with the port to use (in my case 5062).

    .. highlights::
        _sip._udp.residential.p-cscf.sfr.net has SRV record 10 0 5062 mitry.p-cscf.sfr.net.
        _sip._udp.residential.p-cscf.sfr.net has SRV record 10 0 5062 corbas.p-cscf.sfr.net.
        _sip._udp.residential.p-cscf.sfr.net has SRV record 10 0 5062 trappes.p-cscf.sfr.net.


**Configuring NAT to redirect SFR/RED BOX calls to NGINX**
----------------------------------------------------------

To allow correct port forwarding, we will configure OPNSense to affect a **static** IP to the SFR/RED Box and we will create an alias for it.

Services / DHCPv4 / [LAN]
+++++++++++++++++++++++++

Select :menuselection:`Services --> DHCPv4 --> [LAN]`

Click on `[+]` to add a static mapping:

.. image:: images/SFRRED_services_dhcp_lan.png
	:width: 100%

Firewall / NAT / Port Forward
+++++++++++++++++++++++++++++

Select :menuselection:`Firewall --> NAT --> Port Forward`

Add a new forwarding rule:

.. image:: images/SFRRED_lan_port_forwarding.png
	:width: 100%



.. Note::
    Right now, everything should be ready. Restart the firewall, once ready plug the SFR/RED Box on your LAN and start it.
    You should be able to enjoy IPv4, IPv6 and Phone.