On 2014-12-31 16:09, David C Lawrence wrote: > Jeroen Massar writes: >> A host of mine is receiving a lot of requests towards >> applicast.ga.sony.net, eg, every minute when that TV Is on: > ... >> and so on and on.... are these not because of stale DNS data? > > I honestly don't know, but it seems unlikely. I'll not claim its > impossible though. Or, more aptly, it seems obvious that SOMEONE has > stale data somewhere, but it is unlikely that it is our resolvers with > the serve-stale feature.
Someone is the right word. Hard to determine where that is though and why it is happening at multiple distinct sources. > Knowing the feature intimately, I can tell you a couple of other things: > > * The name applicast.ga.sony.net is resolving just fine, so even if it > were slow to resolve the caches would get the current authoritative > value and use that going forward. > > * The length of time for which the resolver will continue to use stale > data is itself capped. It is the "canary in the coal mine" -- > monitored to warn of a DNS problem before it really blows up. If > the problem can't be fixed within a reasonable amount of time, then > the stale entry is purged anyway and things start really failing. > > You didn't say how long that particular example has been an issue, but > it sounds like you've been seeing it for longer than the hard cap. 4 months and more at least. > Also, the one IP address you showed that is doing it is not an Akamai > host. We don't currently run a customer-facing resolver service so > our serve-stale feature for internal operations would not present > stale DNS data to an external client. Make sense. > I'll try to have someone look into what's going on, but it'll be slow > at this particular time of year. The best people for it might well be > on winter holiday. Right now I'm more suspicious that someone > embedded IP addresses somewhere, not that stale DNS data is being > used. A colleague of you contacted me, I am providing him with more details so he can dig into it. Greets, Jeroen _______________________________________________ dns-operations mailing list [email protected] https://lists.dns-oarc.net/mailman/listinfo/dns-operations dns-jobs mailing list https://lists.dns-oarc.net/mailman/listinfo/dns-jobs
