[ntp:hackers] Failing over DNS Server Addresses

Danny Mayer mayer at ntp.isc.org
Wed Aug 8 03:17:54 UTC 2007


Dave,

I'm going to dub this poolcasting to distinguish it from the manycasting
you implementing using multicasting.

If Sachim has implemented any of this we'd be glad to integrated or if
he wants and has time to do so we'd give him whatever help he needs.

I will add this to our todo list.

Danny

David L. Mills wrote:
> Danny,
> 
> Sachim's original intent was to add a pool command that would tinkle a 
> willing DNS server, parse what came back and prune the population for 
> the three survivors. Code to prune the survivors and manage refresh is 
> already done for manycast and would be easy to use with pool as well. 
> I'm not sure he finished the code or what shape it is in now.
> 
> THe manycast code wasn't easy. The trick is to age the population after 
> acquisition at a rate coresponding to whether a candidate is the system 
> peer, among the survivors or not. Also considered is whether the straum 
> is below the floor or above the ceiling, which is useful to modulate the 
> scheme, like protect the primary servers, etc.
> 
> Dave


More information about the hackers mailing list