[ntp:questions] Regarding Primary/Secondary NTP setup

Danny Mayer mayer at ntp.org
Sun Feb 22 19:36:46 UTC 2009

Richard B. Gilbert wrote:
> malayter at gmail.com wrote:
>> On Feb 19, 2009 12:28pm, Danny Mayer <mayer at ntp.org> wrote:
>>> You should avoid NAT devices as they cause problems with the source and
>>> destination addresses. This gets really bad with autokey.
>> Avoiding NAT is impossible in today's Internet; we only have about 2 years  
>> of IPv4 addresses left at current allocation rates.
>> This is why NTP autokey is DOA in my opinion. Any protocol that cannot deal  
>> with NAT sensibly simply will not be widely deployed (at least until IPv6  
>> is universally available and routable, which will be about the same time  
>> hell freezes over).
> IP V6 has been available for at least five or six years now.  The 
> Solaris X86 install used to ask if we wanted to include support for it 
> back in 2004.  AFAIK no one uses it because no one routes it.
> It's dead in the water until the infrastructure; e.g. routers and 
> switches, support it.
> AFAIK, that infrastructure support is either missing entirely or there 
> is not yet enough of it in place.

The backbone certainly supports IPv6 and a lot of the routers leading to
it. However most of the ISP's haven't bothered yet as they don't see the
demand for it. Most ISP modern routers support IPv6 but the ISP's aren't
going to turn it on as there is more work for them than demand. The home
routers and cable/DSL modems still don't seem to support IPv6 presumably
because the manufacturers don't see the demand for it.


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