Re: [ntpwg] [TICTOC] WGLC on draft-ietf-ntp-checksum-trailer-01.txt (Was: WGLC on draft-mizrahi-ntp-checksum-trailer-02.txt)

[Tal Mizrahi <[e-mail]>]

Hi Anil,

Thanks for the prompt response.

> I support this draft, But how about more Bit incorporating in field type, Tal let me know your view.

The checksum trailer draft requests IANA to allocate an extension field type.
Note that:
(1) In unauthenticated mode, the checksum trailer extension field is the last one.
(2) In authenticated mode, the checksum trailer extension field is followed by the MAC / Autokey extension field.

The suggested M-bit in draft-choudharykumar-ntp-ntpv4-extended-extensions indicates whether the current extension field is the last or not.
So once the checksum trailer draft has an allocated extension field type, its most significant bit will be fixed to either 0 or 1, but cannot cover both case (1) and case (2) above.

A possible way to resolve this is to have two types allocated in the checksum trailer draft, one for case (1), and another for case (2). The two types would be identical, except for the most significant bit. This would allow future compatibility with the M-bit, if adopted.

A question to the WG: do we want to provision for the potential adoption of the M-bit?

Thanks,
Tal.


-----Original Message-----
From: ntpwg [mailto:ntpwg-bounces+talmi=[e-mail]] On Behalf Of Anil Kumar S N (VRP Network BL)
Sent: Tuesday, June 30, 2015 3:34 PM
To: Karen O'Donoghue; [e-mail]
Cc: [e-mail]
Subject: Re: [ntpwg] WGLC on draft-mizrahi-ntp-checksum-trailer-02.txt

I support this draft, But how about more Bit incorporating in field type, Tal let me know your view.

Thanks & Regards
Anil S N

"Be liberal in what you accept, and conservative in what you send" - Jon Postel



> -----Original Message-----
> From: ntpwg [mailto:ntpwg-bounces+anil.sn=[e-mail]] On 
> Behalf Of Karen O'Donoghue
> Sent: 30 June 2015 17:59
> To: [e-mail]
> Cc: [e-mail]
> Subject: [ntpwg] WGLC on draft-mizrahi-ntp-checksum-trailer-02.txt
> 
> Folks,
> 
> This begins a two week working group last call (WGLC) on 
> draft-mizrahi- ntp-checksum-trailer-02.txt Using UDP Checksum Trailers 
> in the Network Time Protocol (NTP)
> 
> This document has been proposed as an experimental RFC and has been 
> available for quite some time.
> 
> Please respond by 15 July 2015 to the mailing list with any comments 
> or objections to the draft.
> 
> https://tools.ietf.org/html/draft-mizrahi-ntp-checksum-trailer
> 
> Thanks!
> Karen
> _______________________________________________
> ntpwg mailing list
> [e-mail]
> http://lists.ntp.org/listinfo/ntpwg
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