NAT64 and matching identities

Lee Howard Lee at
Tue Nov 19 14:46:31 UTC 2013

On 11/18/13 3:06 PM, "Justin M. Streiner" <streiner at> wrote:

>It's looking more and more like NAT64 will be in our future.  One of the
>valid concerns for NAT64 - much like NAT44 - is being able to determine
>the identity of a given user through the NAT at a given point in time.

Bulk port allocation. Your NAT logs then approximate your DHCP (or
whatever) logs in size and scope.

Unless you mean to use it to front a web service.  Then just use
x-forwarded-for, and make sure your logs and log parsers can handle it.
Might want to write a correlation script.

>How feasible this is depends on how robust/scalable $XYZ's translation
>logging capabilities are, and possibly how easily that data can be
>against a source of identify information, such as RADIUS accounting logs,
>DHCP lease logs, etc.

Ask the vendors; it took them a while, but they all have techniques for
reducing logs.

>Other IPv6 transition mechanisms appear to be no less thorny than NAT64
>for a variety of reasons.

Yes; see rfc7021.

Once you've deployed it, an experience report at a NANOG meeting would be


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