Re: [Softwires] ISP CGN logging inc. Destination ??

["Gottlieb, Jordan J" <[e-mail]>]

If I understand this correctly it appears that requirement #1 would dictate the capability must be deployed on the CE.  The way I read it you are attempting to retain the pre-NAPT client address and port.  For the particular use case, is the CPE managed by the service provider?  If so, why not originate the logging from the CPE as it has the necessary visibility and state maintenance to meet all the requirements?

There was also a comment in this thread regarding UDP and session completion.  I don’t think this is practical on the BR as support for asymmetrical routing could result in incomplete session information on a particular BR (you would have to piece it together) as exit transit BR could be different from the return transit BR.  The only device with a complete view of the flow is the CE in this case as well.

Assuming CPE is not an option, MAP-T , and that requirement #1 is not the privately addressed customer endpoint (laptop, tablet, smartphone, etc..) one could use netflow pre-BR (IPv6) and some simple program to convert to the required metadata.  Destination address is trivial as it is a fixed set of bits within the DMR(s).  Source address is not hard as long as the conversion program has an accurate list of active mapping rules.  Obviously sampling rate comes into play but I believe we have the same issue with IPFIX.

Cheers,

Jordan

From: Softwires [mailto:[e-mail]] On Behalf Of [e-mail]
Sent: Wednesday, May 09, 2018 1:31 AM
To: Rajiv Asati (rajiva); [e-mail]; [e-mail]
Cc: [e-mail]; [e-mail]
Subject: Re: [Softwires] ISP CGN logging inc. Destination ??

Hi Rajiv,

What concerns me with this requirement is that it nullifies one of the motivations for stateless address sharing:
https://tools.ietf.org/html/draft-ietf-softwire-stateless-4v6-motivation-05#section-3.1.3 (Logging - No Need for Dynamic Binding Notifications)

especially, this part:

   Some Service Providers have a requirement to use only existing
   logging systems and to avoid introducing new ones (mainly because of
   Capital Expenditure (CAPEX) considerations).  This requirement is
   easily met with stateless solutions.

Cheers,
Med

De : Softwires [mailto:[e-mail]] De la part de Rajiv Asati (rajiva)
Envoyé : mardi 8 mai 2018 23:43
À : [e-mail]; [e-mail]
Cc : [e-mail]; [e-mail]
Objet : Re: [Softwires] [EXTERNAL] Re: ISP CGN logging inc. Destination ??

Agree with Ramesh. DHCP(v6) helps with logging source IP assignment, but that’s it.

The requirement here is about keeping track of not only source IP+port, but also destination IP+port per connection. DHCP(v6) doesn’t apply here.

--
Cheers,
Rajiv

From: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
Date: Tuesday, May 8, 2018 at 1:15 AM
To: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
Cc: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>, Rajiv Asati <[e-mail]<mailto:[e-mail]>>, Softwires-wg list <[e-mail]<mailto:[e-mail]>>, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
Subject: RE: [EXTERNAL] Re: [Softwires] ISP CGN logging inc. Destination ??

Not really. Need IPv4 because desitination IP is on IPv4.

Regds
ramesh chandra
M#: [phone]
O#: [phone]

-----Original Message-----
From: Lee, Yiu [mailto:[e-mail]]
Sent: 07 May 2018 16:46
To: Ramesh R Chandra
Cc: [e-mail]<mailto:[e-mail]>; [e-mail]<mailto:[e-mail]>; [e-mail]<mailto:[e-mail]>; [e-mail]<mailto:[e-mail]>
Subject: Re: [EXTERNAL] Re: [Softwires] ISP CGN logging inc. Destination ??

Just a quick thought. Will the dhcpv6 logs help?

Sent from mobile device, pardon possible typo.

On May 7, 2018, at 7:06 AM, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>> wrote:
Dear Ian,  thanks for clarifications.
Regulator in India mandated to preserve the following details for each flow.
1.    Source IP + Port (private for end subscriber device)
2.    Destination IP + Port (public)
3.    Translated IP + port (public)
4.    Date and time
There is no brainer and all this is available in NAT44. MAP being stateless, no such data available from MAP-BR. We are exploring alternate option on BR to create this data in MAP.
Pls advise.
Regds
ramesh
-----Original Message-----
From: [e-mail]<mailto:[e-mail]> [mailto:[e-mail]]
Sent: 04 May 2018 17:28
To: Rajiv Asati (rajiva)
Cc: Softwires-wg list; [e-mail]<mailto:[e-mail]>; Ramesh R Chandra
Subject: Re: [Softwires] ISP CGN logging inc. Destination ??
Hi Rajiv,
Please see inline.
Cheers,
Ian
On 4. May 2018, at 12:01, Rajiv Asati (rajiva) <[e-mail]<mailto:[e-mail]>> wrote:
Ian,
Thanks for sharing the URL. While not explicit, “all metadata” would include both source and destination A+P. Is that the right interpretation?
[if - My understanding is that per-flow logging is necessary to meet
the requirement, but I’m not familiar enough with the legislation to
know what exactly needs to be stored.]
If an ISP were to use “binding” mode on the BR, then without using net flow/IPFIX, How could the compliance be achieved ?
[if - If there’s address sharing and the requirement is to provide an exact match to a data retention request (in some countries, a list of e.g. 16 users is OK), then AFAICS, you have to use IPFIX.
The implementation problem for this is compounded by the lack of state
table on most BR implementations (e.g. how do you know when a UDP
session has completed without state for that flow?)]
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