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Re: IPv6 Routing & ND vs. Addressing, (Was: Re: <draft-ietf-6man-rfc4291bis-09.txt>)

Fred Baker <fredbaker.ietf@gmail.com> Thu, 13 July 2017 03:14 UTC

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Subject: Re: IPv6 Routing & ND vs. Addressing, (Was: Re: <draft-ietf-6man-rfc4291bis-09.txt>)
From: Fred Baker <fredbaker.ietf@gmail.com>
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Date: Wed, 12 Jul 2017 20:14:15 -0700
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To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Sent using a machine that autocorrects in interesting ways...

> On Jul 12, 2017, at 6:42 PM, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
>> On 13/07/2017 06:32, Manfredi, Albert E wrote:
>> ...
>> Of course, the other option is to expand using ULAs, but then, that's "so IPv4."
> 
> Not. ULA doesn't imply NAT. It just implies private addresses.

I would go a step further. A ULA is a global-scope address that is not advertised in BGP, and if advertised is refused, barring private arrangements. I carry a T-Mobile telephone, and the address of the DNS server is a ULA address. The point, I have no doubt, is to prevent attacks on the server by having it untraceable absent a legitimate reason to have the address.

It's a firewall rule that is programmed in routing instead of a firewall. Nothing more, and nothing less.

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