[ntp:questions] Doubt about Syncronization of GPS SPECTRACOM(2)

mills at udel.edu mills at udel.edu
Mon Mar 12 17:09:03 UTC 2007


Danny,

For record, I lit up a couple of Vistae here and they immediately found 
each other with IPv6.

Dave

Danny Mayer wrote:
> Rick Jones wrote:
> 
>>>Windows doesn't support it until Vista (but then I'm only adding
>>>transport support for IPv6 for Windows now)! And you will see this with
>>>older platforms. We had to emulate getaddrinfo() for older platforms.
>>
>>Sounds like stuffing those checks into the emulation of getaddrinfo()
>>and then supporting AI_ADDRINFO to the main code would be a good thing -
>>that way when someone uses the ntp code as an example they will be
>>seeing goodness :)
> 
> 
> You're right about that except that the getaddrinfo() emulation code
> will never support IPv6. getaddrinfo() was designed to support both IPv4
> and IPv6 but if you don't have the function in your library on your
> system it's reasonable to only assume IPv4. If you look carefully, it
> basically translates into a gethostbyname() wich can only handle IPv4
> anyway. So why bother?
> 
> On the other hand adding it into the code to force the real code to
> check if possible would be useful since people have systems set up that
> can support IPv6 but didn't set up the infrastructure on the machine so
> there are no IPv6 interface addresses but it can retrieve an IPv6
> address as a result of the lookup.
> 
> 
>>>Are you looking at doing performance testing for NTP like you've done
>>>for BIND?
>>
>>Hadn't really thought about it - didn't think that NTP had performance
>>issues.  I suppose if folks think it important something could be added
>>to netperf4 (which I cannot recall if it uses AI_ADDRCONFIG or not :)
>>
> 
> 
> I know of no performance issues with NTP even when I try and bang it
> hard for testing purposes.
> 
> 
>>http://www.netperf.org/svn/netperf4/trunk
>>
>>althought there is also the place where I'm trying to "GObjectify" things:
>>
>>http://www.netperf.org/svn/netperf4/branches/gobject_migration
>>
>>rick jones
>>BTW, since I'm not subscribed to questions at lists.ntp.isc.org those folks
>>only see stuff in the replies :)
>>
> 
> 
> We have a two-way gateway between questions and cptn so everyone sees
> everything...
> 
> Danny
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