On Mon, 12 May 2003, Gert Doering wrote:
I have just added an update to the "strict" filter list of my IPv6 filter list recommendations on http://www.space.net/~gert/RIPE/ipv6-filters.html
The new thing is that inside 2001:500::/29, the "strict" list is now permitting /48s. This is because 2001:500:: is used for ARIN microallocations, and /48s are the "normal" allocation boundary in there.
Two networks are already announced from within that block, 2001:500::/48 and 2001:500:1::/48, and some ISPs promtly can't reach them due to too tight filtering.
So if you filter very strictly, please adapt your filters for that block.
There is a danger that this uncoordinated madness will spread. There has been a proposal to extend the microallocation policy, but luckily enough it has been shot down. IMO, you should only let in 2001:500::/32 upto /48 if you really have to, and not the other blocks in the /29 (especially, don't let through exchange point addresses, under 2001:504::/32). Please refer to: http://www.arin.net/registration/ipv6/micro_alloc.html -- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings