X-Mailer: MIME-tools 5.508 (Entity 5.508) MIME-Version: 1.0 References: <33ff3726ac2d0ce42462ddc334ac67d5@www.isc.org> Content-Disposition: inline Content-Type: text/plain; charset="utf-8" X-RT-Interface: Web Message-ID: Content-Transfer-Encoding: binary X-RT-Original-Encoding: utf-8 In-Reply-To: RT-Send-CC: Content-Length: 633 On Tue Feb 13 19:39:22 2018, mkrishna@palcnetworks.com wrote: > I am able to see exact 999 file descriptors as pasted below. > I have got this output using '*lsof*'. => you have reached the silly (but not real) limit of 1000 open file descriptors of Linux. As it often hurts with named there are a lot of documentation about to break this limit. Unfortunately it is a bit late here but as it is a recurrent issue someone in another timezone should be able to help you. BTW very recent versions of ISC DHCP can be compiled with a better replacement for select() which can show performance issue with a large number of descriptors.