The
ND Cache in NPTv6 Example
In the above example, multiple peers connect to the
firewall though a switch, with ND occurring between the peers and
the switch, between the switch and the firewall, and between the
firewall and the devices on the trust side.
As the firewall learns of peers, it saves their addresses to
its ND cache. Trusted peers FDDA:7A3E::1, FDDA:7A3E::2, and FDDA:7A3E::3
are connected to the firewall on the trust side. FDDA:7A3E::99 is
the untranslated address of the firewall itself; its public-facing
address is 2001:DB8::99. The addresses of the peers on the untrust side
have been discovered and appear in the ND cache: 2001:DB8::1, 2001:DB8::2, and
2001:DB8::3.