In message <4eebe5ad.9080...@si6networks.com>, Fernando Gont writes: > On 12/16/2011 08:45 PM, Mark Andrews wrote: > > The real worry is the amount of state that busy authoritative servers > > will be maintaining. At 13K+ mostly unique clients a second to answer > > that's a lot of state. > > Well, that's assuming the queries are really fragmented into more than > one packet. Is there any data about this? (i.e., size of requests)
It's the state on the sending side I'm worried about. You are adding ~13K entries a second to the destination cache it will soon get large as *every* DNS/UDP response has a fragmentation header. Instead of maintainin a counter on a per-destination basis, hash the source and destination and use a pool of fragment counters possibly using differently seeded lsfr. -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
