I am confused in IPv6, i was research some RFC but certainly i dont knows if i choose the correct. i need to configure some cisco stuff with IPv6 and i want to know what ipv6 use for private and public.
| 7 bits |1| 40 bits | 16 bits | 64 bits |
| Prefix |L| Global ID | Subnet ID | Interface ID |
Prefix FC00::/7 prefix to identify Local IPv6 unicast
L Set to 1 if the prefix is locally assigned.
Set to 0 may be defined in the future. See
Section 3.2 for additional information.
Global ID 40-bit global identifier used to create a
globally unique prefix. See Section 3.2 for
Subnet ID 16-bit Subnet ID is an identifier of a subnet
within the site.
Interface ID 64-bit Interface ID as defined in [ADDARCH].
Ask yourself why you are wanting to implement ULA in your IPv6 network. If it is because it bears a striking resemblance to RFC1918 and its functionality, and that is a design paradigm you're familiar with, then you should reconsider. Private addressing was conceived due to address scarcity, something that IPv6 does not suffer from!
If I were you, I'd use GUA throughout your network and at the very least protect it with a perimeter firewall.
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