Shane,
That is true. However, I feel the need to point a subtle, yet
important difference from today's environment.
First, today, the ISP has direct knowledge prior to this 'event'
occurring and given the direct contractual relationship they have with
the customer the ISP would (IMO) be more likely to have a significant
business interest (i.e.: get paid) to ensure the order was valid,
applicable, etc. /before/ it was carried out. IOW, if the ISP is not
providing service to the customer, then the ISP may be unable to bill
for all or part of that service provided, (one, simple example:
usage-based billing). OTOH, if a third-party (RIR?) higher up the
allocation hierarchy were to "whack" a cert, thus making a cert for a
resource invalid can the same be said?
Fair question. In the case of RIPE, where there was a LEO action that
was somewhat analogous to ROA
whacking, RIPE fought the action (in court). Only time will tell if
other RIRs adopt a similar approach.
Second, consider the 'scope' of where such a change will be propagated
and a time-to-restore back to "normalcy" after the matter is
rectified. Today -- for better or worse -- it's the immediate
upstream ISP(s) of the targeted entity that, in your example, would be
curtailing the propagation of routes and/or forwarding to the
'targeted entity' to/from the rest of the Internet. IOW, if (or,
when) the matter is appropriately resolved, then (I suspect) the
restoration times to get the customer back online are minimal today
given we are largely talking about BGP propagation times, i.e.: likely
minutes. Ultimately, it's just those immediate upstream ISP's that
need to 'act' in order to propagate that route to the entire Internet.
I think that's a fair characterization of an example that I gave.
OTOH, in a fully RPKI-enabled world, SP's the world over are
performing origin filtering using information from the RPKI at all of
their customer and peering interconnections ... this could make for
some rather long 'restoration' times for the 'targeted entity' based
on several of the models I've seen tossed around in SIDR. And, the
longer the restoration times, again, the more noticeable the impact it
could have on the ISP's who provide service to/from the 'targeted
entity', (again: usage-based billing).
When a targeted entity detects that it's ROA has been whacked, it can
try to notify RPs (via out of band means).
The easiest action for RPs to take if they choose to not act on the
whacking is to retain the old data that
they have cached. So, the time it would take to deal the whacking is
determined by the time it takes to
get the word out to RPs (after detection of the whacking.
Nonetheless, I will be interested to see if the paper you are writing
will include these types of detail.
yes, it does.
if an RIR accidentally allocated the same prefix to two different
entities, there would be a problem
for one or both of them when they tried to advertise the
twice-allocated space.
While theoretically a possibility, I'd be curious to know if the above
is a common occurrence? If the RIR were concerned about this, one
quick way to ensure this did not happen would be for the RIR to
consult a "live" routing table to see if the space they are
(re-)allocating is already being announced somewhere. In fact, I'd be
surprised if they did not do this already. (Granted, this does not
prevent the same space from ever being twice allocated, because the
first allocation was sitting dormant/not-announced at that moment).
I think this is a very, very unlikely failure case. I just mentioned it
because others have cited this as a
concern.
Steve
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