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Investigate: Evaluate semantics of IPv6 forwarding #785

@jovatn

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@jovatn

The way Infix handles the IPv6 forwarding primitive differs significantly from what's stated in ietf-ip.yang.
Is this how we want it?

New idea on 2025-02-05: Disable global IPv6 forwarding handle until at least one interface has IPv6 forwarding true.

Quote from Infix documentation:

For IPv6 the ability to route between interfaces is always enabled, instead this flag controls ... 

Quote from ietf-ip.yang.

     leaf forwarding {        type boolean;        default false;        description          "Controls IPv6 packet forwarding of datagrams received by,           but not addressed to, this interface.  IPv6 routers           forward datagrams.  IPv6 hosts do not (except those           source-routed via the host).";        reference          "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)                     Section 6.2.1, IsRouter";      } 

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