Hey Paul, On 2/26/19 19:59, Paul Wilson wrote:
Thank you Aftab. On 27 Feb 2019, at 11:58, Aftab Siddiqui wrote:
[...]
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.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.
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: elvis@v4escrow.net Mobile: +1 (702) 970 0921