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Re: [v6ops] draft-ietf-v6ops-ula-usage-recommendations - work or abandon?

Fernando Gont <fgont@si6networks.com> Mon, 09 November 2015 01:48 UTC

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Date: Sun, 08 Nov 2015 22:48:38 -0300
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From: Fernando Gont <fgont@si6networks.com>
To: Lorenzo Colitti <lorenzo@google.com>
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Cc: IPv6 Operations <v6ops@ietf.org>
Subject: Re: [v6ops] draft-ietf-v6ops-ula-usage-recommendations - work or abandon?
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El 9/11/2015 10:18, "Lorenzo Colitti" <lorenzo@google.com> escribió:
>
> On Mon, Nov 9, 2015 at 4:53 AM, Fernando Gont <fgont@si6networks.com>
wrote:
>>
>> > They still work fine on networks that
>> > operate the way the Internet was originally designed with end-to-end
>> > connectivity.
>>
>> not sure what you mean by "end-to-end" connectivity.
>>
>> But if you refer to the property where there is no filtering between the
>> aforementioned two devices, I wonder how many of such networks are
>> interconnected via the public Internet.
>
>
> False dichotomy. Not all filtering causes equal damage to applications.

NAT "broke" FTP for two reasons:

1) IP addresses transferred in the app protocol: this is flawed design. It
makes the app protocol layer-3 dependent, when it need not.

2) "Diode firewall" as a side effect: one might argue that this is flawed
design, too. And an ipv6 diode firewall breaks ftp as badly (hence pasvd).

So in this.respect, nat had just exposed flawed design.

Thanks,
Fernando

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