Re: [ntpwg] [dhcwg] Re: Network Time Protocol (NTP) OptionsforDHCPv6

[Ted Lemon <[e-mail]>]

On Nov 27, 2007, at 4:00 PM, David L. Mills wrote:
> If the DHCP server followed that advice, it would
> occasionally re-resolve the name and pass the new IP address to its
> clients.  It is not at all clear that this advice is followed in the  
> real
> world.

It is followed, actually.   E.g., the Nominum DHCP server (DCS) just  
looks the name up every time, under the assumption that the caching  
name server is going to perform better than any ad hoc resolver we  
might stuff into the DHCP server.   The ISC DHCP server caches names  
for an hour - a decision I made when caching name servers weren't as  
good as they are now, and when I was a lot more naive about DNS than I  
am now.  I can't speak for the other vendors, so you'd have to ask  
them, but I'd be really surprised if they didn't do the same thing -  
if you cache the value, you have to cache it some/where/ - it's not  
quite the same as when a server looks up an address in the DNS so that  
it can connect to that address.

I don't know what SOHO routers do, in general - it would be  
interesting to investigate.



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