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To subscribe or unsubscribe via the World Wide Web, visit https://lists.isc.org/mailman/listinfo/dhcp-users or, via email, send a message with subject or body 'help' to dhcp-users-requ...@lists.isc.org You can reach the person managing the list at dhcp-users-ow...@lists.isc.org When replying, please edit your Subject line so it is more specific than "Re: Contents of dhcp-users digest..." Today's Topics: 1. Re: Script to run on DHCPNAK (perl-list) ---------------------------------------------------------------------- Message: 1 Date: Thu, 20 Jul 2017 14:45:02 -0400 (EDT) From: perl-list <perl-l...@network1.net> To: Users of ISC DHCP <dhcp-users@lists.isc.org> Subject: Re: Script to run on DHCPNAK Message-ID: <218577036.457663.1500576302041.javamail.zim...@network1.net> Content-Type: text/plain; charset="utf-8" I can be of no help then. I wish you luck! > From: "Mark Spring" <mspr...@nktelco.com> > To: "Users of ISC DHCP" <dhcp-users@lists.isc.org> > Sent: Thursday, July 20, 2017 2:37:26 PM > Subject: Re: Script to run on DHCPNAK > Correct on the first paragraph. > Not according to cable labs, it's considered a troubleshooting interface. I > asked if there was a way to make the config sticky or set an expiration. No > dice :s > On Thu, Jul 20, 2017 at 2:35 PM perl-list < [ mailto:perl-l...@network1.net | > perl-l...@network1.net ] > wrote: >> I see .. so the cable modem is acting like a router until the cable circuit >> totally comes up in which case it starts acting more like a bridge? >> Last idea: Any chance that the cable modems could be told not to serve DHCP >> under any circumstances? Like a default config? >>> From: "Mark Spring" < [ mailto:mspr...@nktelco.com | mspr...@nktelco.com ] > >>> To: "Users of ISC DHCP" < [ mailto:dhcp-users@lists.isc.org | >>> dhcp-users@lists.isc.org ] > >>> Sent: Thursday, July 20, 2017 2:28:29 PM >>> Subject: Re: Script to run on DHCPNAK >>> No, the 192 is a cable modem so not much control there. Any control I apply >>> to >>> it is lost until it boots...per cable labs spec. >>> On Thu, Jul 20, 2017 at 2:27 PM perl-list < [ mailto:perl-l...@network1.net >>> | >>> perl-l...@network1.net ] > wrote: >>>> Mark, >>>> Is it the ISC server that is also handing out the 192.168.100.20 address >>>> or a >>>> different DHCP server? If its all the same server, I'm thinking class {} >>>> statements and allow members of "class"; would be the appropriate fix right >>>> inside the DHCP config... >>>> If it is a different DHCP server that is ALSO ISC that you could modify, >>>> you >>>> could use class {} statements in there to cause it to ignore booting from >>>> clients it shouldn't serve. >>>>> From: "Mark Spring" < [ mailto:mspr...@nktelco.com | mspr...@nktelco.com >>>>> ] > >>>>> To: "Users of ISC DHCP" < [ mailto:dhcp-users@lists.isc.org | >>>>> dhcp-users@lists.isc.org ] > >>>>> Sent: Thursday, July 20, 2017 8:53:11 AM >>>>> Subject: Re: Script to run on DHCPNAK >>>>> 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. >>>>> Hope this helps, thanks for replying! >>>>> Mark Spring >>>>> Information Systems Manager >>>>> On Thu, Jul 20, 2017 at 8:45 AM, perl-list < [ >>>>> mailto:perl-l...@network1.net | >>>>> perl-l...@network1.net ] > wrote: >>>>>> Mark, >>>>>> 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. >>>>>> What is the actual problem that you are having as I am not sure this has >>>>>> anything to do with it... >>>>>>> From: "Mark Spring" < [ mailto:mspr...@nktelco.com | >>>>>>> mspr...@nktelco.com ] > >>>>>>> To: "Users of ISC DHCP" < [ mailto:dhcp-users@lists.isc.org | >>>>>>> dhcp-users@lists.isc.org ] > >>>>>>> Sent: Thursday, July 20, 2017 8:31:30 AM >>>>>>> Subject: Re: Script to run on DHCPNAK >>>>>>> isc, just one server here is an example >>>>>>> Jul 19 10:04:36 dhcp dhcpd: DHCPREQUEST for 192.168.100.20 from >>>>>>> 00:03:e6:6f:42:14 via [ http://10.4.0.1/ | 10.4.0.1 ] : wrong net >>>>>>> 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 >>>>>>> Jul 19 10:04:39 dhcp dhcpd: DHCPDISCOVER from 00:03:e6:6f:42:14 via >>>>>>> 10.4.0.1 >>>>>>> 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 >>>>>>> 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. >>>>>>> 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 >>>>>>> Mark Spring >>>>>>> Information Systems Manager >>>>>>> On Thu, Jul 20, 2017 at 8:22 AM, perl-list < [ >>>>>>> mailto:perl-l...@network1.net | >>>>>>> perl-l...@network1.net ] > wrote: >>>>>>>> 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? >>>>>>>>> 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. >>>>>>>>> ___ >>>>>>>> _______________________________________________ >>>>>>>> dhcp-users mailing list >>>>>>>> [ mailto:dhcp-users@lists.isc.org | dhcp-users@lists.isc.org ] >>>>>>>> [ https://lists.isc.org/mailman/listinfo/dhcp-users | >>>>>>>> https://lists.isc.org/mailman/listinfo/dhcp-users ] >>>>>>> NKTelco >>>>>>> 301 W. South St. >>>>>>> New Knoxville, OH 45871 >>>>>>> Phone: 1-888-NKTELCO >>>>>>> Fax: [ tel:(419)%20753-2950 | 419-753-2950 ] >>>>>>> This message and the file(s) attached are confidential and proprietary >>>>>>> information of NKTelco for the sole use of the intended recipient. Any >>>>>>> unauthorized review, distribution, disclosure, copying, use, or >>>>>>> dissemination, either whole or in part, is strictly prohibited. Do not >>>>>>> transmit these documents, in any form, to any third party without the >>>>>>> expressed written permission of NKTelco. >>>>>>> _______________________________________________ >>>>>>> dhcp-users mailing list >>>>>>> [ mailto:dhcp-users@lists.isc.org | dhcp-users@lists.isc.org ] >>>>>>> [ https://lists.isc.org/mailman/listinfo/dhcp-users | >>>>>>> https://lists.isc.org/mailman/listinfo/dhcp-users ] >>>>>> _______________________________________________ >>>>>> dhcp-users mailing list >>>>>> [ mailto:dhcp-users@lists.isc.org | dhcp-users@lists.isc.org ] >>>>>> [ https://lists.isc.org/mailman/listinfo/dhcp-users | >>>>>> https://lists.isc.org/mailman/listinfo/dhcp-users ] >>>>> NKTelco >>>>> 301 W. South St. >>>>> New Knoxville, OH 45871 >>>>> Phone: 1-888-NKTELCO >>>>> Fax: 419-753-2950 >>>>> This message and the file(s) attached are confidential and proprietary >>>>> information of NKTelco for the sole use of the intended recipient. Any >>>>> unauthorized review, distribution, disclosure, copying, use, or >>>>> dissemination, either whole or in part, is strictly prohibited. Do not >>>>> transmit these documents, in any form, to any third party without the >>>>> expressed written permission of NKTelco. >>>>> _______________________________________________ >>>>> dhcp-users mailing list >>>>> [ mailto:dhcp-users@lists.isc.org | dhcp-users@lists.isc.org ] >>>>> [ https://lists.isc.org/mailman/listinfo/dhcp-users | >>>>> https://lists.isc.org/mailman/listinfo/dhcp-users ] >>>> _______________________________________________ >>>> dhcp-users mailing list >>>> [ mailto:dhcp-users@lists.isc.org | dhcp-users@lists.isc.org ] >>>> [ https://lists.isc.org/mailman/listinfo/dhcp-users | >>>> https://lists.isc.org/mailman/listinfo/dhcp-users ] >>> -- >>> Mark Spring >>> Information Systems Manager >>> NKTelco >>> 301 W. South St. >>> New Knoxville, OH 45871 >>> Phone: 1-888-NKTELCO >>> Fax: 419-753-2950 >>> This message and the file(s) attached are confidential and proprietary >>> information of NKTelco for the sole use of the intended recipient. Any >>> unauthorized review, distribution, disclosure, copying, use, or >>> dissemination, either whole or in part, is strictly prohibited. Do not >>> transmit these documents, in any form, to any third party without the >>> expressed written permission of NKTelco. >>> _______________________________________________ >>> dhcp-users mailing list >>> [ mailto:dhcp-users@lists.isc.org | dhcp-users@lists.isc.org ] >>> [ https://lists.isc.org/mailman/listinfo/dhcp-users | >>> https://lists.isc.org/mailman/listinfo/dhcp-users ] >> _______________________________________________ >> dhcp-users mailing list >> [ mailto:dhcp-users@lists.isc.org | dhcp-users@lists.isc.org ] >> [ https://lists.isc.org/mailman/listinfo/dhcp-users | >> https://lists.isc.org/mailman/listinfo/dhcp-users ] > -- > Mark Spring > Information Systems Manager > NKTelco > 301 W. South St. > New Knoxville, OH 45871 > Phone: 1-888-NKTELCO > Fax: 419-753-2950 > This message and the file(s) attached are confidential and proprietary > information of NKTelco for the sole use of the intended recipient. Any > unauthorized review, distribution, disclosure, copying, use, or > dissemination, either whole or in part, is strictly prohibited. Do not > transmit these documents, in any form, to any third party without the > expressed written permission of NKTelco. > _______________________________________________ > dhcp-users mailing list > dhcp-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/dhcp-users -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20170720/b547838f/attachment.html> ------------------------------ Subject: Digest Footer _______________________________________________ dhcp-users mailing list dhcp-users@lists.isc.org https://lists.isc.org/mailman/listinfo/dhcp-users ------------------------------ End of dhcp-users Digest, Vol 105, Issue 18 *******************************************