Joe Abley writes: > if you can find a set of DNS authority servers that silently > discards a particular kind of query, sending such queries through > resolvers that are known to support serve-stale might suppress other > queries and trigger the serve-stale behaviour even though the > authority servers are not actually unresponsive for them.
RFC 2308 section 7.2 made it clear that when caching a dead server indication, "The indication MUST be stored against query tuple <query name, type, class, server IP address> unless there was a transport layer indication that the server does not exist, in which case it applies to all queries to that specific IP address." The scenario described in one of a resolver that is modern enough to have implemented standards-compliant serve-stale behavior but is still not standards-compliant with a two decade old RFC, interacting over a path with a delegation to authoritative servers that are all exhibiting erratic behavior. This needs some supporting evidence that it could really be a real-world problem that needs to be addressed. _______________________________________________ DNSOP mailing list [email protected] https://www.ietf.org/mailman/listinfo/dnsop
