Kenneth Porter schrieb: >> At dnswl.org, we consider any source (being losely defined as a /24 doing >> more than 100'000 queries / 24 hours as a "large" user, and ask them to >> switch to rsync access (however this is not strongly enforced at present, >> and does not involve money). > > Does it help to configure one's DNS server to direct queries for this > zone to one's ISP's servers, to let the ISP provide some additional > caching and consolidation? I don't generally forward/stub to my ISP but > I'd be willing to do that for services like this to reduce load on the > source.
As always: It depends :) If multiple users with roughly equal traffic patterns use the same ISPs nameserver, caching should be efficient enough to noticeably reduce the WAN load. In that case it may even make sense if the ISP would set up a local mirror of our data (even if only for it's own users and not as a public mirror). OpenDNS may have a big enough user base in order to make the caching truly effective (but they started using a local copy of our data some time ago, so I can't even guess the order of magnitude of their "cache factor"). But, if you are willing to configure your nameserver specifically for such lists, you may even use a local copy of the data yourself - we provide a BIND-formatted file. [I just noticed that we don't have setup hints on http://www.dnswl.org/tech - I just opened an internal ticket to fix that :) ] -- Matthias
