<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Andale Mono; font-size: 10pt; color: #000000'>you could add them to a class and then ignore the class? That should at least reduce the load - it certainly will stop them from generating log messages.<br><br><div><br></div><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Simon Hobson" <dhcp1@thehobsons.co.uk><br><b>To: </b>"Users of ISC DHCP" <dhcp-users@lists.isc.org><br><b>Sent: </b>Wednesday, March 7, 2012 10:52:12 AM<br><b>Subject: </b>Re: does isc dhcp 4.2.3 support blocking client which send many<br><br>Martin McCormick wrote:<br><br>>A good mechanism for controlling insane systems<br>>might be to read time intervals between each MAC address contact<br>>and start ignorring anybody who has contacted DHCPD more than X<br>>number of times in X number of seconds.<br><br>Which is the sort of task Logwatch was written for. Anyone know if <br>any DHCP filters/actions have been written for it ?<br><br>However, that won't work for devices behind a relay agent. And <br>someone said that iptables doesn't work either.<br><br>-- <br>Simon Hobson<br><br>Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed<br>author Gladys Hobson. Novels - poetry - short stories - ideal as<br>Christmas stocking fillers. Some available as e-books.<br>_______________________________________________<br>dhcp-users mailing list<br>dhcp-users@lists.isc.org<br>https://lists.isc.org/mailman/listinfo/dhcp-users<br><br></blockquote><br></div></body></html>