Martin Burnicki wrote: > David, > > David J Taylor wrote: >> Richard B. Gilbert wrote: >> [] >>> I've been using Comcast for five or six years now without a problem! >>> YMMV. >> >> There have been a few problems with my ISP, hence I moved to a 3rd >> party. > > We did't ever have any problems using the DNS servers of our ISPs.
At the time, mine was using servers in the USA (from the UK) and via non-reciprocal paths. Even now, it seems to be using servers from abroad, and has no local reference clock.... I don't think that anyone "cared" for it. >> I used to have my own DNS server. You do /not/ have to get the rest >> of the world from Comcast. DNS is /not/ like NTP, and you talk >> directly to the root servers to start with, which then pass you down >> gradually to the correct server for the domain (e.g. for >> microsoft.com) and in future you query the relevant domain server >> directly. All seems to work very smoothly and automatically. > > IMHO DNS is not like NTP in the sense that is just *starts* sending > queries for domains which have not yet been resolved to the root DNS > servers and then are redirected/go on down to the authoritative DNS > for that domain, whereas NTP would stuck with the top level servers > if they have been configured. Agreed. When I first answered I had missed that Richard probably knows more about DNS than me! > However, if several local subnets needed to resolve "microsoft.com" > then each one would have to ask the root servers the first time. Wouldn't you have one or two central DNS servers for both subnets? > If you send DNS queries to your ISP's servers then this would save > bandwidth since they are normally closer to your network than the > root DNS servers, and there is a chance that other customers of your > ISP has already sent queries for "microsoft.com" so this has already > been cached by the ISP's DNS servers and no request has to be made to > the root servers. > > IMHO in this sense it's similar to NTP so the load is distributed and > not concentrated on the root servers. > > Martin Agreed, it's a distributed system. I monitor the faults reported to my ISP, and DNS problems do come up, hence my preference for a 3rd party solution. It's also one less thing to change were I to change ISP. Cheers, David _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions