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Re: [ntpwg] New Version Notification for draft-ietf-ntp-network-time-security-12.txt and draft-ietf-ntp-using-nts-for-ntp-03.txt

Harlan Stenn <stenn@ntp.org> Wed, 23 December 2015 22:44 UTC

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From: Harlan Stenn <stenn@ntp.org>
To: mayer@ntp.org
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References: <56785CE5.6080102@ntp.org> <OFDECED69B.3FA71F92-ONC1257F22.0063AA4C-C1257F22.006401FE@ptb.de> <OF3D6DD6FA.812C6BCC-ONC1257F22.00775A28-C1257F22.00775A29@ptb.de> <567877FB.7030608@ntp.org> <OF0AC1CCBA.2E240196-ONC1257F23.00313FBA-C1257F23.0033AC80@ptb.de> <5679639D.4010906@nwtime.org> <56799A3E.3020506@ntp.org> <OFB626AB50.8283A0AC-ONC1257F24.002B274D-C1257F24.002CE30C@ptb.de> <567AB392.8040008@ntp.org>
Comments: In-reply-to Danny Mayer <mayer@ntp.org> message dated "Wed, 23 Dec 2015 09:45:38 -0500."
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Date: Wed, 23 Dec 2015 21:13:46 +0000
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Subject: Re: [ntpwg] New Version Notification for draft-ietf-ntp-network-time-security-12.txt and draft-ietf-ntp-using-nts-for-ntp-03.txt
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Danny Mayer writes:
> ... The problem is that a
> MAC extension field needs to be specified so that it can replace the
> existing MAC field. I'm also considering allowing for multiple MAC
> extension fields in a single packet so that one MAC hashing algorithm
> can be retired if found to be compromisable without disrupting NTP
> infrastructure and existing implementations. It also needs some
> discussion on usage by responding packets and which to use.

If this is a V4 thing there will be backward compatability issues.

I think I have an idea about how to do this so older systems might still
work.  It will require more research though.

H
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