[sunset4] Stateless NAT44 vs MAP/4rd

[Simon Perreault <[e-mail]>]

On 07/11/2012 12:44 PM, Dan Wing wrote:
>> draft-tsou-stateless-nat44-00
> 
> This seems to be a MAP solution.  But differs from MAP in that it uses
> an IPv4 network between the subscriber and the ISP's "stateless NAT44"
> device, whereas MAP uses an IPv6 network between the subscriber and
> the ISP's "MAP border relay" device.

I think this is a fair comparison.

One advantage of SLNAT44 over MAP is that the necessary changes to the
CPE are minimal. For example, a vanilla Linux can do SLNAT44 today.

Another advantage of SLNAT44 is simpler provisioning: CPEs don't need to
have access to all the "mapping rules" for direct communication to work.
In MAP/4rd, a CPE needs to compute the IPv6 address to which the IPv4
address it wants to reach is mapped. That's why rules need to be
downloaded to the CPE. In SLNAT44, you just send the packet directly to
the IPv4 address you want to reach. There is no overlay network, so no
rules to be downloaded.

Simplicity! :)

Simon
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