RFC say all read RFC
BIND is a DNS system not an alien so follow RFC Go and read RFC ________________________________ From: bind-users <bind-users-boun...@lists.isc.org> on behalf of ip admin via bind-users <bind-users@lists.isc.org> Sent: Friday, October 5, 2018 4:13 PM To: bind-users@lists.isc.org Subject: Which timeouts are used by BIND when resolving recursive queries? Hi, I understand that I can configure a global timeout for resolving recursive queries (resolver-query-timeout) but find that I cannot configure the timeout for an individual query used during DNS resolution. For testing I configured one unreachable forwarder (and enabled forward only) and saw (tcpdump) that BIND (9.10.6-P1) is first trying two queries with EDNS which each seems to have a timeout of 1.2s. Afterwards queries without ENDS are sent which seem to have a timeout of 1.6s, then 3.2s, then 6.4s, then 9s, finally the maximum (=total) resolver-query-timeout of 30s is reached. Is the timeout behaviour documented anywhere (similar to a stub resolver or dig, i.e. how long are timeouts, how many tries per server etc). If someone did find a logging setting that shows which servers are used when recursing (forwarding or delegations) to find a response (and when the individual queries time out) that would be helpful as well. Regards Tom
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