https://community.sophos.com/utm-firewall/unified-threat-management-beta/utm_94_beta/f/sophos-utm-9-4-public-beta/75273/dhcp6-dosI&#39;m using Sophos UTM 9.4 beta 2 at home on an Intel NUC. It hasn&#39;t been perfoming right, and I tracked it down to my new printer requesting ~60 DHCP6 addresses per second, filling up the dhcp6.leases file at a rate of about 15kbytes/second, and eventuallyen-USTelligent Community 12https://community.sophos.com/thread/289480?ContentTypeID=1Fri, 04 Mar 2016 16:43:43 GMT4be5eb7d-caa4-4ff5-8e60-8f9463545a35:84ecab7b-0519-4b0c-9993-2f565744ae13jamesharper<p>It&#39;s a HP 5740 All-In-One (print, scan, copy, fax). IPv6 must be on by default, and it is a static DHCP and DHCP6 lease.</p> <p>I don&#39;t really care about the printer - i&#39;ve turned off IPv6, and usage is all DNS based anyway. I&#39;m more concerned about the ability of a single device to cause issues with the UTM.</p><div style="clear:both;"></div>https://community.sophos.com/thread/289470?ContentTypeID=1Fri, 04 Mar 2016 14:52:34 GMT4be5eb7d-caa4-4ff5-8e60-8f9463545a35:df1965c1-495a-4cf0-89f0-6c1fb1f73fd0BLS<p>Out of curiosity, what is the printer, and what is the firmware installed?</p> <p></p> <p>It could also be worth checking with the manufacture to see if this is a known issue, and if so there could be an updated firmware available?</p> <p></p> <p>Also, most people set printers with static IP addresses, in the corporate world I would imagine the same to be done with printers on IPv6.</p><div style="clear:both;"></div>