Re: [v6ops] reclassify 464XLAT as standard instead of info

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

I think you may be right, it makes sense that a single /128 will be able to allow that, but I think it is clear that needs to be a different one that the CLAT WAN interface. I guess the authors indicated a separated /64 as it seems easier to allocate it than a single address if you’re using DHCPv6-PD. I was just recalling what is in the actual RFC:

6.3.  IPv6 Prefix Handling

   There are two relevant IPv6 prefixes that the CLAT must be aware of.

   First, CLAT must know its own IPv6 prefixes.  The CLAT should acquire
   a /64 for the uplink interface, a /64 for all downlink interfaces,
   and a dedicated /64 prefix for the purpose of sending and receiving
   statelessly translated packets.  When a dedicated /64 prefix is not
   available for translation from DHCPv6-PD [RFC3633], the CLAT may
   perform NAT44 for all IPv4 LAN packets so that all the LAN-originated
   IPv4 packets appear from a single IPv4 address and are then
   statelessly translated to one interface IPv6 address that is claimed
   by the CLAT via the Neighbor Discovery Protocol (NDP) and defended
   with Duplicate Address Detection (DAD).

Regards,
Jordi
 

-----Mensaje original-----
De: <[e-mail]> en nombre de David Schinazi <[e-mail]>
Responder a: <[e-mail]>
Fecha: martes, 19 de septiembre de 2017, 22:21
Para: <[e-mail]>
CC: <[e-mail]>
Asunto: Re: [v6ops] reclassify 464XLAT as standard instead of info

    
    > On Sep 19, 2017, at 17:51, JORDI PALET MARTINEZ <[e-mail]> wrote:
    > 
    > If you do it with SLAAC, as described in the RFC, the NAT46 will be stateful (by means of a previous NAT44) because you don’t have a specific /64 for the translation. Otherwise will be stateless.
    
    I don't think that's correct. In order to make 464XLAT stateless you need a separate /128, not /64. And SLAAC allows you to generate that extra /128. As far as I know, this is how Android works.
    
    As far the discussion of changing the Category of the RFC, I'm not sure what it accomplishes, and whether it's worth spending time on.
    
    David
    



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