[Note: this is independent of "GUPI"]
GUSL
Globally Unique Site Local
Goals:
1. Provide an allocation method of site-local addresses
within FEC0::/10 in order to avoid ambiguity of such
addresses.
2. Enforce the non-routability of site-local addresses
on the public Internet.
3. Clarify the use of site-local addresses for
inter-site traffic.
1. Allocation method:
1.1 Rationale.
There is a need for three types of allocation:
- Free, automated configuration, no registration,
no external connection, almost unique.
- Free, manual or semi-automatic configuration,
no registration, Internet connection necessary
for semi-automatic configuration, unique.
- Fee-based, manual registration, unique.
Additonal properties TBD.
1.2 The site-local address space (FEC0::/10) will be
divided in 3 parts:
1.2.1 Free, random/hash allocation, for unattended/
automated setups.
See Paul Francis / Pekka Savola
FEC0::/11
1.2.2 Unregistered, free, unique, sequentially
allocated.
See Charlie Perkins.
FEE0::/12
1.2.3 Registered, probably not free, geographical or
other allocation method, TBD.
FEF0::/12
1.3 Choice of allocation method:
1.3.1 If the router autoconfigures itself, use 1.2.1,
then save the prefix obtained in the config.
1.3.2 If there is interaction with the user, offer
the choice:
a) Manual, then save in config.
b) Contact Charlie's server, then save in config.
c) Same as 1.3.1.
2. Enforcement of global non-routability:
2.1 Rationale.
Ambiguity provided some fail-safe for route leaks.
By removing ambiguity, we must provide additional
Enforcement of non-routability.
2.2 Routers MUST have a default blackhole for FEC0::/10.
See Bob Hinden.
This blackhole MUST NOT be easily removable, as it
does not prevent the site from using more specific
prefixes within FEC0::/10
2.3 Routers MUST discard by default any BGP routes
matching FECO::/10 ge 10. See Michel Py.
Accepting such routes MUST require specific permit
statements.
3. Multiple sites:
GUSL addresses SHOULD NOT be used for communication with
other sites.
(I am open to a MUST NOT, whatever the WG consensus is)
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