arrange: nat, PBR, policy

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-.. include:: _include/need_improvement.txt
-
-.. _nptv6:
-
-#####
-NPTv6
-#####
-
-:abbr:`NPTv6 (Network Prefix Translation)` is a form of NAT for IPv6. It's
-described in :rfc:`6296`.
-
-**Usage**
-
-NPTv6 is very useful for IPv6 multihoming. It is also commonly used when the
-external IPv6 prefix is dynamic, as it prevents the need for renumbering of
-internal hosts when the extern prefix changes.
-
-Let's assume the following network configuration:
-
-* eth0 : LAN
-* eth1 : WAN1, with 2001:db8:e1::/48 routed towards it
-* eth2 : WAN2, with 2001:db8:e2::/48 routed towards it
-
-Regarding LAN hosts addressing, why would you choose 2001:db8:e1::/48 over
-2001:db8:e2::/48? What happens when you get a new provider with a different
-routed IPv6 subnet?
-
-The solution here is to assign to your hosts ULAs_ and to prefix-translate
-their address to the right subnet when going through your router.
-
-* LAN Subnet : fc00:dead:beef::/48
-* WAN 1 Subnet : 2001:db8:e1::/48
-* WAN 2 Subnet : 2001:db8:e2::/48
-
-* eth0 addr : fc00:dead:beef::1/48
-* eth1 addr : 2001:db8:e1::1/48
-* eth2 addr : 2001:db8:e2::1/48
-
-VyOS Support
-^^^^^^^^^^^^
-
-NPTv6 support has been added in VyOS 1.2 (Crux) and is available through
-`nat nptv6` configuration nodes.
-
-.. code-block:: none
-
-  set rule 10 source prefix 'fc00:dead:beef::/48'
-  set rule 10 outbound-interface 'eth1'
-  set rule 10 translation prefix '2001:db8:e1::/48'
-  set rule 20 source prefix 'fc00:dead:beef::/48'
-  set rule 20 outbound-interface 'eth2'
-  set rule 20 translation prefix '2001:db8:e2::/48'
-
-Resulting in the following ip6tables rules:
-
-.. code-block:: none
-
-  Chain VYOS_DNPT_HOOK (1 references)
-   pkts bytes target   prot opt in   out   source              destination
-      0     0 NETMAP   all    eth1   any   anywhere            2001:db8:e1::/48  to:fc00:dead:beef::/48
-      0     0 NETMAP   all    eth2   any   anywhere            2001:db8:e2::/48  to:fc00:dead:beef::/48
-      0     0 RETURN   all    any    any   anywhere            anywhere
-  Chain VYOS_SNPT_HOOK (1 references)
-   pkts bytes target   prot opt in   out   source              destination
-      0     0 NETMAP   all    any    eth1  fc00:dead:beef::/48 anywhere          to:2001:db8:e1::/48
-      0     0 NETMAP   all    any    eth2  fc00:dead:beef::/48 anywhere          to:2001:db8:e2::/48
-      0     0 RETURN   all    any    any   anywhere            anywhere
-
-.. _ULAs: https://en.wikipedia.org/wiki/Unique_local_address