Re: [Ntp] WGLC for draft-ietf-ntp-mac
Paul Gear <ntp@libertysys.com.au> Thu, 10 August 2017 23:29 UTC
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From: Paul Gear <ntp@libertysys.com.au>
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Date: Fri, 11 Aug 2017 09:29:11 +1000
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Subject: Re: [Ntp] WGLC for draft-ietf-ntp-mac
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On 09/08/17 14:53, Karen O'Donoghue wrote: > Folks, > > This begins a three week working group last call (WGLC) for "Message > Authentication Code for the Network Time Protocol" > https://datatracker.ietf.org/doc/draft-ietf-ntp-mac/ > > Please review and provide comments to the mailing list by no later > than 31 August 2017. Earlier comments and discussion would be > appreciated. Please note that the chairs will be using this WGLC to > determine consensus to move this document forward to the IESG. Hi everyone, (Apologies in advance if this isn't an appropriate forum for these questions - please redirect me if this is the case.) I'm trying to get a handle on this draft so I can intelligently answer questions about it next month at AusNOG, and I'm wondering if someone can comment on the on-the-wire implications for NTP implementations. As I understand it, there are no proposed changes to the protocol's wire format under this draft, rather a simple substitution of the 128-bit MD5 field for a 128-bit AES-CMAC field. How then would an implementation distinguish between MACs in the two formats? Is there an implicit assumption that if this draft is accepted, it will be rolled into a new protocol version specification for NTPv5, in which case any NTPv4 packet would be MD5, and any NTPv5 packet would be AES-CMAC? As a secondary issue, are there any working implementations of this change, and if so any benchmarks showing the effect (if any) of the change? Thanks, Paul
- [Ntp] WGLC for draft-ietf-ntp-mac Karen O'Donoghue
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Paul Gear
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Harlan Stenn
- Re: [Ntp] [TICTOC] WGLC for draft-ietf-ntp-mac Tal Mizrahi
- [Ntp] REMINDER: WGLC for draft-ietf-ntp-mac Karen O'Donoghue
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Daniel Franke
- [Ntp] Antw: Re: WGLC for draft-ietf-ntp-mac Ulrich Windl
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Jiangyuanlong
- Re: [Ntp] REMINDER: WGLC for draft-ietf-ntp-mac Greg Dowd
- [Ntp] Antw: Re: WGLC for draft-ietf-ntp-mac Ulrich Windl
- Re: [Ntp] Antw: Re: WGLC for draft-ietf-ntp-mac Jiangyuanlong
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Miroslav Lichvar
- Re: [Ntp] [TICTOC] WGLC for draft-ietf-ntp-mac Sharon Goldberg
- Re: [Ntp] [TICTOC] WGLC for draft-ietf-ntp-mac Daniel Franke
- Re: [Ntp] [TICTOC] WGLC for draft-ietf-ntp-mac Sharon Goldberg
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Matthew Van Gundy
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Harlan Stenn
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Daniel Franke
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Matthew Van Gundy
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Harlan Stenn
- Re: [Ntp] WGLC for draft-ietf-ntp-mac Harlan Stenn