Re: [ntpwg] Antw: Re: I-D Action: draft-ietf-ntp-checksum-trailer-05.txt

[Hal Murray <[e-mail]>]

[e-mail] said:
>>> New servers would use the new MAC, perhaps in conjunction with a new
>>> extension field that says "I am the last extension field" so if something
>>> comes after it we'd know it was an old-style MAC. 
>> Why is that case interesting?  Why would a new server want an old-style 
MAC?
> It wouldn't.  But a new instance can talk with an old instance.

I don't understand how a new instance is going to talk to an old instance 
without using old format packets.  So why is the format of new style packets 
interesting when discussing old servers?

Are there any new style extension fields in use now?  Are there half-new 
servers out there?

The case that makes sense to me is to grandfather the old lengths for autokey 
and shared key of various types.  Any other extension length must use new 
style TLV format.  We would need a dummy field type so you can add padding to 
change the length if whatever you want to send ends up with one of the 
reserved lengths.


-- 
These are my opinions.  I hate spam.



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