Re: [v6ops] updating RFC8026 to support 464XLAT in draft-ietf-v6ops-transition-ipv4aas

[JORDI PALET MARTINEZ <[e-mail]>]

Lorenzo, you’re missing the key aspect: Being able to prioritize, when an ISP supports several transition mechanisms.

 

RFC8026 key aspect is priority. If we don’t add an option code for 464XLAT, then it can’t be managed the same way.


Regards,

Jordi

 

 

 

De: v6ops <[e-mail]> en nombre de Lorenzo Colitti <lorenzo=[e-mail]>
Fecha: miércoles, 13 de junio de 2018, 4:45
Para: <jordi.palet=[e-mail]>
CC: "[e-mail] WG" <[e-mail]>
Asunto: Re: [v6ops] updating RFC8026 to support 464XLAT in draft-ietf-v6ops-transition-ipv4aas

 

On Tue, Jun 12, 2018 at 7:40 PM JORDI PALET MARTINEZ <jordi.palet=[e-mail]> wrote:

You don’t need RFC7050 neither DNS64, you can use PCP (RFC7225) to tell the CLAT the NAT64 prefix. It also provides additional advantages to the operator to control many related aspects (see section 3 of RFC7225).

 

1.       If the operator wants to enable 464xlat: they should hand out a DNS64 to the CPE.

2.       If the operator wants to disable 464xlat: they should NOT hand out a DNS64 to the CPE.

This doesn’t work, because the operator may be using RFC7225 instead of RFC7050. You need to try both in that case, and you aren’t providing a “priority” to a possible list of mechanisms, which is what RFC8026 does.

 

But it's the same problem again: what's the use case for this DHCPv6 option? An operator that's using RFC7225 has an easy way to tell the CPE not to do 464xlat: don't hand out the prefix64 to those CPEs. So this is already possible today.

  

3.       If the operator uses 464xlat, they should not allow the user to change the DNS server.

 

 

Let’s be realistic. You can’t “force” the customer to avoid changing the DNS …

 

On an operator-managed CPE, you can. On a user-managed CPE, you can't. But on such a CPE you probably shouldn't be disabling 464xlat. If the user wants to use it, it's their CPE, right?

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