In message <blu149-w57a261f59f90728f956cea85...@phx.gbl>, MontyRee writes: > > Hello, all. > > my system is centos 4.x, bind 9.5.1-P3 and only recursion is allowed from > some ranges. > > I can see lots of messages like below. > so if I didn't set any clients-per-query value,some clients' queries may be > droppped or not?
clients-per-query is designed to prevent the nameserver being overwhelmed by a given query that doesn't resolve. It sets the number of simultanious clients that are acutally recursing on a given name. It value is increased if there is a successful resolution of that query after dropping some clients then slowly decays over time. Note UDP clients are expected to retry. clients-per-query reflects how many clients ask for a busy name/type in the time it takes to resolve that name/type. If it takes 200 ms resolve the query and you need 20 clients-per-query then the name/type is being asked for around 100 times a second. > If some queries can be dropped,I want to set like "clients-per-query 0". You actually want to set clients-per-query to around 20 based on these logs, the default is 10. > 05-Oct-2009 16:04:46.228 resolver: notice: clients-per-query decreased to 14 > 05-Oct-2009 16:14:47.337 resolver: notice: clients-per-query increased to 19 > 05-Oct-2009 16:34:47.338 resolver: notice: clients-per-query decreased to 18 > 05-Oct-2009 16:54:47.339 resolver: notice: clients-per-query decreased to 17 > 05-Oct-2009 17:01:55.424 resolver: notice: clients-per-query increased to 22 > 05-Oct-2009 20:20:26.252 resolver: notice: clients-per-query increased to 15 > 05-Oct-2009 20:40:26.253 resolver: notice: clients-per-query decreased to 14 > 05-Oct-2009 21:00:26.253 resolver: notice: clients-per-query decreased to 13 > 05-Oct-2009 21:11:26.298 resolver: notice: clients-per-query increased to 15 > > > > Thanks in advance. -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
