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

[Danny Mayer <[e-mail]>]

On 12/23/2015 4:13 PM, Harlan Stenn wrote:
> 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.
> 

No, not really. New code like NTS would use the new Extension Field but
the MAC will need to be kept for older systems who won't be able to use
NTS anyway.

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

The older systems won't know about the NTS stuff so it doesn't matter.
The MAC itself can't go away until v5.

Danny

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