Hey Paul,
On 2/26/19 19:59, Paul Wilson wrote:
Thank you Aftab.
On 27 Feb 2019, at 11:58, Aftab Siddiqui wrote:
[...]
This means there are no more IPv4 bogon blocks, making bogon filtering
unnecessary.
We will continue to reclaim address space from closed members, and perhaps we
will be able to reclaim some of the unused address space in APNIC ranges. When
we do that, we always reserve the reclaimed space for some time, before
reallocating it. This is precisely to ensure that the space is not being
announced (which would be a bogon), or subject to other blacklisting or quality
issues.
So, bogons can exist in future, any time that a currently unallocated address
block appears in the routing table. But whether ISPs will filter them is
another question.
Paul.
While I think the bogon filtering was very useful in the past, I also
believe that adding the prefixes that are reclaimed to the bogon list
for a short period of time will probably cause more harm than good.
I'm sure you have ways to monitor if someone is announcing
reclaimed/unallocated space and ask their upstreams to stop propagating
that announcement. I am not sure that adding a prefix to the bogon list
for 3 months (or more) is the best way to ensure that space is not being
announced.
I doubt all the ISPs are updating their daily filters to include the
bogon list, maybe I am mistaken. I know of a few examples where the
bogon list was fetched once, filters were built and that was it... for
years.
Just some food for thought.
Elvis
--
Elvis Daniel Velea
V4Escrow LLC
Chief Executive Officer
E-mail: [email protected]
Mobile: +1 (702) 970 0921
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