From www@isc.org Wed Feb 22 20:11:20 2017 MIME-Version: 1.0 X-Spam-Status: No, score=-3.3 required=5.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,RP_MATCHES_RCVD,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.0 X-Mailer: PHPMailer 5.2.22 (https://github.com/PHPMailer/PHPMailer) content-type: text/plain; charset="utf-8" Message-ID: Received: from mx.pao1.isc.org (mx.pao1.isc.org [IPv6:2001:4f8:0:2::2b]) by bugs.isc.org (Postfix) with ESMTP id EE43371B5A8 for ; Wed, 22 Feb 2017 20:11:19 +0000 (UTC) Received: from iscwebprod.isc.org (iscwebprod.isc.org [IPv6:2001:4f8:1:d::16]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx.pao1.isc.org (Postfix) with ESMTPS id D139E34930F for ; Wed, 22 Feb 2017 20:11:17 +0000 (UTC) Received: from www (uid 80) (envelope-from www@iscwebprod.isc.org) id 7b7d0b by iscwebprod.isc.org (DragonFly Mail Agent v0.11); Wed, 22 Feb 2017 20:11:17 +0000 Delivered-To: dhcp-bugs@bugs.isc.org Subject: ISC 4.3.3-P1 - Server-side Option 57 dhcp-max-message-size not working Return-Path: X-Original-To: dhcp-bugs@bugs.isc.org Date: Wed, 22 Feb 2017 20:11:17 +0000 X-Wpcf7-Content-Type: text/plain X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mx.pao1.isc.org X-PHP-Originating-Script: 20001:class-phpmailer.php To: dhcp-bugs@isc.org From: "Christoph Aichhorn" X-RT-Original-Encoding: utf-8 X-RT-Interface: Email Content-Length: 1179 Bug Report from www.isc.org: Name: Christoph Aichhorn Email: christoph.aichhorn@grz.at Software Version: ISC 4.3.3-P1 OS: Infoblox Subject:Server-side Option 57 dhcp-max-message-size not working Bug Detail =========== At the end of the Release notes following is documentated: "If the dhcp-max-message-size option is specified in scope, and the client didn't send this option, use the one specified in scope to determine the maximum size of the response." We need to use this server-side-option, because it's not possible to set this as client option in Windows 7. As we are moving from Microsoft DHCP to ISC, and MS ignores the RFC defined max size of 574 Bytes, there was no problem with Microsoft DHCP when a client requested as many options within a DHCP INFORM packet that answer exceeded the max size of 574 bytes. ISC is working correct as long as option 57 is not defined and returns only that amount of requested options that fits within 574 bytes. After defining option 57 on the server side with a value of 1024 byte, the ISC DHCP continues to reply with maximum 574 byte long packets. --- This email was received through isc.org Bug Submission Form