Re: [ippm] WGLC for draft-ietf-ippm-twamp-06.txt

["Jeff W. Boote" <[e-mail]>]

On Mar 28, 2008, at 1:15 PM, Murtaza Chiba (mchiba) wrote:
> Another clarification question.
>
> For Test packets the draft is not clear on the order of encryption and
> authentication.   One can assume that the intent was to first encrypt
> and then authenticate the fields which is the reverse of Control
> packets.   It would be nice to see clarification text in the section
> 4.2.1 of TWAMP and section 4.1.2 of OWAMP.

I did not go read the TWAMP section to see if the situation is the  
same, but for OWAMP there is no order at all. There are 3 different  
'modes':

open, encrypted, authenticated.

These modes are negotiated in the control connection, and which  
process the individual packets go through is defined based on the  
selected mode. They are independent - there is no order to consider.

The difference between authenticated and encrypted is that the  
timestamp information is sent unencrypted in authenticated mode to  
reduce the amount of time from when the timestamp was retrieved and  
the packet is actually sent. In encrypted mode, the entire data  
segment is encrypted including the timestamp.

Perhaps I'm completely missing the point?

jeff



> -Murtaza
>
> -----Original Message-----
> From: [e-mail] [mailto:[e-mail]] On Behalf  
> Of
> Murtaza Chiba (mchiba)
> Sent: Tuesday, March 25, 2008 1:10 PM
> To: Henk Uijterwaal
> Cc: IETF IPPM WG
> Subject: Re: [ippm] WGLC for draft-ietf-ippm-twamp-06.txt
>
>
>
> Some more questions on TWAMP draft.
>
> Q1) Section 3.8 Stop Sessions mentions that command can only be sent  
> by
> the Session-Sender.   I believe the authors meant Control-Client as  
> the
> Session-Sender does not exchange a control command.
>
> Q2) In the same section it mentions that NO session description record
> can be sent, however, it also mentions that the Next SeqNo and  
> Number of
> Skip Ranges MUST be set to 0 and those are part of the session
> description record!   I am assuming the authors ONLY meant to exclude
> the no. Skip Ranges record.
>
> Q3) Is it possible to add a SID to a Start-Sessions message?   That
> would help limit the meaning of Active to be per SID allowing for
> different SIDs to be started and stopped on demand.   Sometimes one  
> may
> want to start a Test Stream in response to an observed network
> behaviour.
>
> Q4) If the above is acceptable then I propose adding a
> Control-Command-type field to all response messages and hence the  
> Accept
> field should be the second field.  It also entails adding a SID in the
> Requests and Responses.
>
> -Murtaza
>
> -----Original Message-----
> From: [e-mail] [mailto:[e-mail]] On Behalf  
> Of
> Henk Uijterwaal
> Sent: Monday, March 17, 2008 8:12 AM
> To: Henk Uijterwaal
> Cc: IETF IPPM WG
> Subject: Re: [ippm] WGLC for draft-ietf-ippm-twamp-06.txt
>
> IPPM Group,
>
>> This is a WGLC for the draft: draft-ietf-ippm-twamp-06.txt
>>
>> The draft has been discussed extensively in this group and appears to
>> to be stable by now.  We like to start a WGLC in order to move it
> forward.
>> Please raise any remaining issues by Friday, March 14, 9:00 UTC.
>>
>> An URL for the draft is:
>>
>>  http://www.ietf.org/internet-drafts/draft-ietf-ippm-twamp-06.txt
>
> This concludes the WGLC for this draft.  Two issues were raised on the
> list.  We'll ask the authors to respond to those on the list and to
> include fixes in the draft.  After that we'll move the document  
> forward.
>
> Matt & Henk
>
>
> --
> ------------------------------------------------------------------------
> ------
> Henk Uijterwaal                           Email:
> henk.uijterwaal(at)ripe.net
> RIPE Network Coordination Centre
> http://www.amsterdamned.org/~henk
> P.O.Box 10096          Singel 258         Phone: [phone]
> 1001 EB Amsterdam      1016 AB Amsterdam  Fax: [phone]
> The Netherlands        The Netherlands    Mobile: [phone]
> ------------------------------------------------------------------------
> ------
>
> Is one of the choices leaving the office open?
>                                       Alan Greenspan on the next
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jeff
--
Jeff W. Boote
[e-mail]




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