Comments on: IPv6: downsides of a larger address space http://securityandthe.net/2009/07/15/ipv6-downsides-of-a-larger-address-space/?utm_source=rss&utm_medium=rss&utm_campaign=ipv6-downsides-of-a-larger-address-space News and opinions about security, the internet and more Sat, 05 Jun 2010 08:04:47 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Paul Markshttp://securityandthe.net/2009/07/15/ipv6-downsides-of-a-larger-address-space/comment-page-1/#comment-1519 Paul Marks Thu, 16 Jul 2009 04:36:07 +0000 http://securityandthe.net/?p=1422#comment-1519 No sane blacklist is ever going to care about the last 64 bits of the address, so your concerns about privacy addresses are irrelevant.You might want to come up with a blacklist-querying protocol that's more efficient than DNS, since asking about a 64-bit prefix should ideally require only 8 bytes.I think there will exist a zone of uncertainty between /48 and /64, but it's not the end of the world. No sane blacklist is ever going to care about the last 64 bits of the address, so your concerns about privacy addresses are irrelevant.

You might want to come up with a blacklist-querying protocol that’s more efficient than DNS, since asking about a 64-bit prefix should ideally require only 8 bytes.

I think there will exist a zone of uncertainty between /48 and /64, but it’s not the end of the world.

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