Re: [BEHAVE] predictable translations

[<[e-mail]>]

Dear Kris,

Thank you for the clarification.

I was confused because I thought you meant a "stateless NAT" which is not the case in deterministic NAT (since NAT mappings are still required for translating IP datagrams).

Cheers,
Med

________________________________
De : Poscic, Kristian (Kristian) [mailto:[e-mail]]
Envoyé : vendredi 23 septembre 2011 18:21
À : BOUCADAIR Mohamed OLNC/NAD/TIP; '[e-mail]'
Objet : RE: predictable translations

Hi Med,
By predictable translation I mean deterministic NAT.

For now, I'm just trying to evaluate (for my own sake) if this deterministic NAT makes any sense since 1) would take care of the concerns that I have. If deterministic NAT makes deployable sense [for a reason that I yet need to find, since 1) already takes care of my concerns], then I'm trying to evaluate surrounding issues related to ease of integration into existing OS  (which it looks like does not come into play) and any other legal issues related to use of already possibly patented algorithms.

Thanks,
Kris

From: [e-mail] [mailto:[e-mail]]
Sent: Thursday, September 22, 2011 11:00 PM
To: Poscic, Kristian (Kristian); '[e-mail]'
Subject: RE: predictable translations

Dear Kris,

Could please precise more what you mean by "predictable translation"?

(1) Do you want to eliminate the volume of CGN logs (e.g, few entries per customer) or (2) you want to eliminate the CGN logging (e.g., rely on DHCP records)?

(1) can be done in the CGN itself by design or configuration of the CGN to use port ranges. This is already supported by CGN implementation including A(..)U ;-)

(2) can be supported only if you eliminate the NAT function in the CGN which should be a PRR (Port Range Router; http://tools.ietf.org/html/draft-boucadair-port-range-02#section-6) instead.


Cheers,
Med

________________________________
De : [e-mail] [mailto:[e-mail]] De la part de Poscic, Kristian (Kristian)
Envoyé : vendredi 23 septembre 2011 01:28
À : '[e-mail]'
Objet : Re: [BEHAVE] predictable translations
I looked at this draft draft-bsd-softwire-stateless-port-index-analysis-00<http://datatracker.ietf.org/doc/draft-bsd-softwire-stateless-port-index-analysis/> which examines 6 different algorithms for predictable translation applicable to v4/v6 translation but I guess it can be potentially adopted for v4 to v4 conversions as well.

As my coworker (who is probably on this list) says "too many deterministic nat drafts make for non-deterministic behaviours".
Is there any plan to adopt one as a standard?
Thanks,
Kris

From: Poscic, Kristian (Kristian)
Sent: Thursday, September 22, 2011 11:57 AM
To: [e-mail]
Subject: predictable translations

Hi there -
Does anyone knows of any draft that is addressing a more predictable translations between the inside IP and outside IP + port range when it comes to NAT44.
For example in order to avoid logging, IPv4 inside address would be automatically (via an algorithm) be converted to an outside IPv4 address  + a port range. This mapping would be unique so that no logging is required. The revertive algo would be able to convert the outside IP + port back  to the inside IP.

I've seen some drafts addressing something similar in the softwire WG but they all deal with IPv4/IPv6 translations.
Thanks,
Kris