+5545. [func] OS support for load-balanced sockets is no longer
+ required to receive incoming queries in multiple netmgr
+ threads. [GL #2137]
+
+5543. [bug] Fix UDP performance issues caused by making netmgr
+ callbacks asynchronous-only. [GL #2320]
+
+5542. [bug] Refactor netmgr. [GL #1920] [GL #2034] [GL #2061]
+ [GL #2194] [GL #2221] [GL #2266] [GL #2283] [GL #2318]
+ [GL #2321]
+
--- 9.16.10 released ---
5544. [func] Restore the default value of "nocookie-udp-size" to 4096
--- /dev/null
+..
+ Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+
+ This Source Code Form is subject to the terms of the Mozilla Public
+ License, v. 2.0. If a copy of the MPL was not distributed with this
+ file, you can obtain one at https://mozilla.org/MPL/2.0/.
+
+ See the COPYRIGHT file distributed with this work for additional
+ information regarding copyright ownership.
+
+Notes for BIND 9.16.11
+----------------------
+
+Security Fixes
+~~~~~~~~~~~~~~
+
+- None.
+
+Known Issues
+~~~~~~~~~~~~
+
+- None.
+
+New Features
+~~~~~~~~~~~~
+
+- None.
+
+Removed Features
+~~~~~~~~~~~~~~~~
+
+- None.
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- The new networking code introduced in BIND 9.16 (netmgr) was
+ overhauled in order to make it more stable, testable, and
+ maintainable. [GL #2321]
+
+- Earlier releases of BIND versions 9.16 and newer required the
+ operating system to support load-balanced sockets in order for
+ ``named`` to be able to achieve high performance (by distributing
+ incoming queries among multiple threads). However, the only operating
+ systems currently known to support load-balanced sockets are Linux and
+ FreeBSD 12, which means both UDP and TCP performance were limited to a
+ single thread on other systems. As of BIND 9.17.8, ``named`` attempts
+ to distribute incoming queries among multiple threads on systems which
+ lack support for load-balanced sockets (except Windows). [GL #2137]
+
+Bug Fixes
+~~~~~~~~~
+
+- None.