ntp symmetric auth for internal clients

Hello,

I am struggeling to figure out, how to use classic ntp auth (not nts) 
for  internal clients - as there are and will be for quite time also 
some isc ntp servers to be served.

Now, the server directrive, that allows for a key, is for the external 
(internet) server, or the source, so a keyid here would make no sense.

I need to specify a key for the systems I am serving to, however, the 
local directrive has no key option available.

And a global option, similar to "trustedkey 5" in ntpd.conf, for those 
who are also familiar with ntpd, seems also not available.

So if I want to require, let's say key 5 for internal clients, what 
would be the proper way to archive this?

The keyfile in question only features sha1 hashes, so I am not running 
into any 160 bytes limitations.

Thanks for any clues or points to according documentation

Ede


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