Locating NTS-KE and NTP servers

[Hal Murray]

This area is a tangle.  I'm looking for ideas.

The context for thinking about this is that several NTS-KE servers have more 
than one IP Address.  I'd like to be able to test all of them and/or maybe use 
more than one.

Let's start with the simple case - no NTS.  There are a few NTP servers with 
names
that return multiple IP Addresses.  I'd like to be able to test all of those 
too.  Fortunately, we can do that by specifying their individual numerical IP 
Addresses.

But a cleaner approach almost works.  If foo has several addresses, it should 
be reasonable to say
  server foo
  server foo
and have the code that processes the DNS answers skip over the ones that are 
already in use. Currently, that doesn't work because configpeers kicks out 
duplicates.  I think the skip-in-use code is there -- or maybe it's over in 
the pool case.

I'll investigate removing that check.

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There are several unimplemented nts server options:
  ask, require
  expire
  cert

Should we remove them, mostly to clean up the documentation?

---------

Maybe there should be a mode so things work similarly to pool: setup servers 
for all IP Addresses that come back from DNS lookup.  But do it only once.  
(pool mode tries again if it needs more servers)

---------

Do we need something like the expire option to check DNS again?


-- 
These are my opinions.  I hate spam.