<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">The trouble is that the server has no way to know it’s the same client if the DUID is unstable. If the mac address is available, you can assign a reservation based on that. Then it wouldn’t matter what DUID the client provides. This is the same behavior as in ISC DHCP concerning DHCPv6. It is defined in RFC 8415. Basically: The DUID must be present and the client must use the same DUID. The server must use that as the identifier to assign leases.<br><div><br><blockquote type="cite"><div>On Jan 17, 2023, at 6:18 AM, Veronique Lefebure <Veronique.Lefebure@cern.ch> wrote:</div><br class="Apple-interchange-newline"><div><meta charset="UTF-8"><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">Waw. The client behaviour is not under control of the DHCP server admins..</span></div><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">This is a behaviour different from the ISC DHCP server behaviour, right ?</span></div><div id="appendonsend" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"></div><hr tabindex="-1" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline-block; width: 654.625px;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;"></span><div id="divRplyFwdMsg" dir="ltr" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><font face="Calibri, sans-serif" style="font-size: 11pt;"><b>From:</b><span class="Apple-converted-space"> </span>Kea-users <kea-users-bounces@lists.isc.org> on behalf of Kevin P. Fleming <lists.kea-users@kevin.km6g.us><br><b>Sent:</b><span class="Apple-converted-space"> </span>Tuesday, January 17, 2023 12:00 PM<br><b>To:</b><span class="Apple-converted-space"> </span>kea-users@lists.isc.org <kea-users@lists.isc.org><br><b>Subject:</b><span class="Apple-converted-space"> </span>Re: [Kea-users] IPV6 client gets the wrong IP for sometime after a reboot</font><div> </div></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div>On Tue, Jan 17, 2023, at 04:54, Veronique Lefebure wrote:<br></div><blockquote type="cite" id="x_qt"><div class="x_qt-elementToProof"><span class="x_qt-elementToProof" style="background-color: rgb(255, 255, 255);"><span class="x_font" style="font-family: Calibri, Arial, Helvetica, sans-serif;"><span class="x_size" style="font-size: 12pt;">Hi,</span></span></span><br></div><div class="x_qt-elementToProof"><span class="x_qt-elementToProof" style="background-color: rgb(255, 255, 255);"><span class="x_font" style="font-family: Calibri, Arial, Helvetica, sans-serif;"><span class="x_size" style="font-size: 12pt;"></span></span></span><br></div><div class="x_qt-elementToProof"><span class="x_qt-elementToProof" style="background-color: rgb(255, 255, 255);"><span class="x_font" style="font-family: Calibri, Arial, Helvetica, sans-serif;"><span class="x_size" style="font-size: 12pt;">I have observed that an IPV6 client gets the wrong IP when it reboots.</span></span></span><br></div><div class="x_qt-elementToProof"><span class="x_qt-elementToProof" style="background-color: rgb(255, 255, 255);"><span class="x_font" style="font-family: Calibri, Arial, Helvetica, sans-serif;"><span class="x_size" style="font-size: 12pt;">See detailed logs below.</span></span></span><br></div><div class="x_qt-elementToProof" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">The problem seems to be due to the fact the DUID of the client changes after reboot.<br></div><div class="x_qt-elementToProof" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">Anyone else has observed the same ?<br></div><div class="x_qt-elementToProof" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">How to go around that and make sure that the client gets the correct IP straightaway after reboot ?<br></div></blockquote><div><br></div><div>You'll need to find a way to configure the client to use a stable DUID if you want it to be given a lease from a host reservation.<br></div><div><br></div></div><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">--<span class="Apple-converted-space"> </span></span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">ISC funds the development of this software with paid support subscriptions. 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