02-07-2017 07:50 PM - edited 03-03-2019 08:28 AM
Hi everyone,
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.
Unique local for private (https://tools.ietf.org/html/rfc4193)
| 7 bits |1| 40 bits | 16 bits | 64 bits | +--------+-+------------+-----------+----------------------------+ | Prefix |L| Global ID | Subnet ID | Interface ID | +--------+-+------------+-----------+----------------------------+ Where: Prefix FC00::/7 prefix to identify Local IPv6 unicast addresses. 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 additional information. 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].
Global unicast for pyblic (https://tools.ietf.org/html/rfc3587)
| 3 | 45 bits | 16 bits | 64 bits | +---+---------------------+-----------+----------------------------+ |001|global routing prefix| subnet ID | interface ID | +---+---------------------+-----------+----------------------------+
Site-Local is depreceated (https://tools.ietf.org/html/rfc4291#section-2.5.7)
02-10-2017 09:38 AM
Hi Jorge,
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.
cheers,
Seb.
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