[master] add fetchlimit to README

diff --git a/README b/README
index 781bb2d468de013c39875d588ea7f982da75aecf..67982136e21b6aa010d99e162945802be3e9e26c 100644 (file)
--- a/README
+++ b/README
@@ -56,6 +56,21 @@ BIND 9.11.0
        BIND 9.11.0 includes a number of changes from BIND 9.10 and earlier
        releases.  New features include:
 
+       - New "fetchlimit" quotas are now available for the use of
+         recursive resolvers that are are under high query load for
+         domains whose authoritative servers are nonresponsive or are
+         experiencing a denial of service attack:
+         + "fetches-per-server" limits the number of simultaneous queries
+           that can be sent to any single authoritative server.  The
+           configured value is a starting point; it is automatically
+           adjusted downward if the server is partially or completely
+           non-responsive. The algorithm used to adjust the quota can be
+           configured via the "fetch-quota-params" option.
+         + "fetches-per-zone" limits the number of simultaneous queries
+           that can be sent for names within a single domain.  (Note:
+           Unlike "fetches-per-server", this value is not self-tuning.)
+          + New stats counters have been added to count
+           queries spilled due to these quotas.
        - The zone serial number of a dynamically updatable zone
          can now be set via "rndc signing -serial <number> <zonename>".
           This allows inline-signing zones to be set to a specific