<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Helvetica;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Andale Mono";
panose-1:0 0 0 0 0 0 0 0 0 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman",serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman",serif;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We have had a similar issue with some of our residential gateways, which sound like they are serving a similar purpose to what you are seeing. I’m not familiar
with their configuration, but the solution for us has been a different configuration on the gateways so that they won’t offer an address to the specific equipment in question. I’m not certain how our field techs are differentiating between the devices that
the gateway should offer an address to and those that it should not offer an address to.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">If that sounds remotely helpful, I can try to get more information or we can discuss offline (it’s not an ISC DHCP issue at that point) and see if there are more
parallels to our situations.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Patrick<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> dhcp-users [mailto:dhcp-users-bounces@lists.isc.org]
<b>On Behalf Of </b>Mark Spring<br>
<b>Sent:</b> Thursday, July 20, 2017 7:53 AM<br>
<b>To:</b> Users of ISC DHCP <dhcp-users@lists.isc.org><br>
<b>Subject:</b> Re: Script to run on DHCPNAK<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">The trouble is that the end device boots too quick and grabs the 192 address from the modem(cable labs spec) then moments later it halts and asks for all the information that would normally be in the DHCP options. The lease from the modem
expires, it requests...server NAK's it. It then gets all the proper info but the client doesn't read in all of the options. In a perfect world I have advised the vendor to read in the options and continue with the client. In the real world, I am trying to
setup things so when I see a NAK, I execute a script...if it matches an OUI then I lookup the IP that it received, SSH into the client and reboot it. The modem is online and everything starts up normal. We are essentially building a reboot script into the
client where it reboots if it fails to receive options the first time around.<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Hope this helps, thanks for replying!<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal"><br clear="all">
<o:p></o:p></p>
<div>
<div>
<div>
<div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">Mark Spring<o:p></o:p></p>
</div>
<p class="MsoNormal">Information Systems Manager<o:p></o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Thu, Jul 20, 2017 at 8:45 AM, perl-list <<a href="mailto:perl-list@network1.net" target="_blank">perl-list@network1.net</a>> wrote:<o:p></o:p></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black">Mark,<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black">That is completely normal. The device 00:03:e6:6f:42:14 previously had an address of 192.168.100.20 and attempted to renew such address. Apparently that address
is not valid on the network your DHCP server is on. So, a NAK was sent followed by a discover from the client. The client and server then negotiated a 10.4.2.191 address.<o:p></o:p></span></p>
</div>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black">What is the actual problem that you are having as I am not sure this has anything to do with it...<o:p></o:p></span></p>
<div class="MsoNormal" align="center" style="text-align:center"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black">
<hr size="3" width="100%" align="center" id="m_4808717052128994203zwchr">
</span></div>
<div>
<blockquote style="border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><b><span style="font-family:"Helvetica",sans-serif;color:black">From:
</span></b><span style="font-family:"Helvetica",sans-serif;color:black">"Mark Spring" <<a href="mailto:mspring@nktelco.com" target="_blank">mspring@nktelco.com</a>><br>
<b>To: </b>"Users of ISC DHCP" <<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a>><br>
<b>Sent: </b>Thursday, July 20, 2017 8:31:30 AM<br>
<b>Subject: </b>Re: Script to run on DHCPNAK<o:p></o:p></span></p>
</blockquote>
</div>
<div>
<blockquote style="border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">isc, just one server here is an example<o:p></o:p></span></p>
<div>
<div>
<p class="MsoNormal"><i><span style="font-family:"Courier New";color:black">Jul 19 10:04:36 dhcp dhcpd: DHCPREQUEST for 192.168.100.20 from 00:03:e6:6f:42:14 via
<a href="http://10.4.0.1" target="_blank">10.4.0.1</a>: wrong net</span></i><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><i><span style="font-family:"Courier New";color:black">Jul 19 10:04:36 dhcp dhcpd: DHCPNAK on 192.168.100.20 to 00:03:e6:6f:42:14 via 10.4.0.1</span></i><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><i><span style="font-family:"Courier New";color:black">Jul 19 10:04:39 dhcp dhcpd: DHCPDISCOVER from 00:03:e6:6f:42:14 via 10.4.0.1</span></i><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><i><span style="font-family:"Courier New";color:black">Jul 19 10:04:40 dhcp dhcpd: DHCPOFFER on 10.4.2.191 to 00:03:e6:6f:42:14 via 10.4.0.1</span></i><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><i><span style="font-family:"Courier New";color:black">Jul 19 10:04:40 dhcp dhcpd: DHCPREQUEST for 10.4.2.191 (192.168.100.3) from 00:03:e6:6f:42:14 via 10.4.0.</span></i><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><i><span style="font-family:"Courier New";color:black">Jul 19 10:04:40 dhcp dhcpd: DHCPACK on 10.4.2.191 to 00:03:e6:6f:42:14 via 10.4.0.1</span></i><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><br clear="all">
<o:p></o:p></span></p>
<div>
<div>
<div>
<div>
<div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
<div>
<div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">Mark Spring<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">Information Systems Manager<o:p></o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">On Thu, Jul 20, 2017 at 8:22 AM, perl-list <<a href="mailto:perl-list@network1.net" target="_blank">perl-list@network1.net</a>> wrote:<o:p></o:p></span></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black"><br>
Are the NAK and ACK coming from the same server? Can you post example log messages of the NAK and ACK and related communication? I assume this is ISC DHCP that we are speaking of and not some proprietary DHCP server?<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black"><o:p> </o:p></span></p>
<div class="MsoNormal" align="center" style="text-align:center"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black">
<hr size="3" width="100%" align="center" id="m_4808717052128994203m_7362953434195411861zwchr">
</span></div>
<div>
<blockquote style="border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
</blockquote>
</div>
<div>
<blockquote style="border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">I am having some issues with network gear, and while arguing with vendors about who's problem it really is..I noticed that my device receives a NAK before it receives the proper
IP address from our server(when the gear comes back online). If I can track this down in the logs then I can look for the ACK that follows, login to the device and reboot it properly. <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><br>
___<o:p></o:p></span></p>
</blockquote>
</div>
</div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black"><o:p> </o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><br>
_______________________________________________<br>
dhcp-users mailing list<br>
<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a><br>
<a href="https://lists.isc.org/mailman/listinfo/dhcp-users" target="_blank">https://lists.isc.org/mailman/listinfo/dhcp-users</a><o:p></o:p></span></p>
</blockquote>
</div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">NKTelco</span><span style="font-family:"Arial",sans-serif;color:#222222"><br>
<span style="background:white">301 W. South St.</span></span><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">New Knoxville, OH 45871</span><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Phone: 1-888-NKTELCO</span><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Fax:
<a href="tel:(419)%20753-2950" target="_blank">419-753-2950</a></span><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222"><br>
<span style="background:white">This message and the file(s) attached are confidential and proprietary</span><br>
<span style="background:white">information of NKTelco for the sole use of the intended recipient. Any </span><br>
<span style="background:white">unauthorized review, distribution, disclosure, copying, use, or </span><br>
<span style="background:white">dissemination, either whole or in part, is strictly prohibited. Do not </span><br>
<span style="background:white">transmit these documents, in any form, to any third party without the </span><br>
<span style="background:white">expressed written permission of NKTelco.</span></span><span style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><br>
_______________________________________________<br>
dhcp-users mailing list<br>
<a href="mailto:dhcp-users@lists.isc.org" target="_blank">dhcp-users@lists.isc.org</a><br>
<a href="https://lists.isc.org/mailman/listinfo/dhcp-users" target="_blank">https://lists.isc.org/mailman/listinfo/dhcp-users</a><o:p></o:p></span></p>
</blockquote>
</div>
</div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Andale Mono",serif;color:black"><o:p> </o:p></span></p>
</div>
</div>
<p class="MsoNormal"><br>
_______________________________________________<br>
dhcp-users mailing list<br>
<a href="mailto:dhcp-users@lists.isc.org">dhcp-users@lists.isc.org</a><br>
<a href="https://lists.isc.org/mailman/listinfo/dhcp-users" target="_blank">https://lists.isc.org/mailman/listinfo/dhcp-users</a><o:p></o:p></p>
</blockquote>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal"><br>
<span style="font-family:"Arial",sans-serif;color:#222222;background:white">NKTelco</span><span style="font-family:"Arial",sans-serif;color:#222222"><br>
<span style="background:white">301 W. South St.</span></span><o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">New Knoxville, OH 45871</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Phone: 1-888-NKTELCO</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Fax: 419-753-2950</span><o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222"><br>
<span style="background:white">This message and the file(s) attached are confidential and proprietary</span><br>
<span style="background:white">information of NKTelco for the sole use of the intended recipient. Any </span><br>
<span style="background:white">unauthorized review, distribution, disclosure, copying, use, or </span><br>
<span style="background:white">dissemination, either whole or in part, is strictly prohibited. Do not </span><br>
<span style="background:white">transmit these documents, in any form, to any third party without the </span><br>
<span style="background:white">expressed written permission of NKTelco.</span></span><o:p></o:p></p>
</div>
</div>
</div>
</body>
</html>