IPv6 Multi WAN
=====================

IPv6 Multi WAN can be configured if VT AIR is connected to multiple
ISPs which each provide an IPv6 address or IPv6 network address range.

Network Prefix Translation (NPTv6)
**********************************

IPv6-to-IPv6 Network Prefix Translation (NPTv6) is a specification for IPv6 to achieve address-independence,
similar to network address translation (NAT) in Internet Protocol version 4 (IPv4).

The setup for IPv6 Multi-WAN is very similiar to IPv4.
The main difference is that you need to define a Network Range in SNAT to achieve NPT.

.. image:: img/ipv6multiwan_01.png
    :width: 100%
    :align: center
    :alt: VT AIR Network Prefix Translation (NPTv6)

.. image:: img/ipv6multiwan_02.png
    :width: 100%
    :align: center
    :alt: VT AIR Network Prefix Translation (NPTv6)

Create a second SNAT Rule for WAN2.

Additionally you need to add the WAN2 Gateway to the main routing table in :ref:`Routing Tables` for a Multi-Gateway Setup :ref:`Multi-Gateway Setup`.