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Re: IP swapping for network restart or reboot for ubuntu client (Kraishak Mahtha) ---------------------------------------------------------------------- Message: 1 Date: Tue, 14 Jun 2022 16:01:29 +0200 From: "Wayne Gemmell | Connect" <wa...@connect-mobile.co.za> To: Users of ISC DHCP <dhcp-users@lists.isc.org> Subject: Re: IP swapping for network restart or reboot for ubuntu client Message-ID: <CAFK6eiv=whtuc4nj+kp9vflv9qcmcb4-6cwe1-5xlkp_rya...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" It is triggered with a netplan apply specifically in our case, no Cisco in sight. On Tue, 14 Jun 2022 at 15:57, perl-list <perl-l...@network1.net> wrote: > Is this by chance in conjunction with Cisco's DHCP Proxy configuration? > What we saw there was that the Cisco device inserted a RELEASE whenever a > DISCOVER happened. The RELEASE was so close (< 5ms) on top of the > subsequent DISCOVER that the DHCP server, in failover, did not have time to > propagate the address being freed up and so a second address would be > configured. We had to get Cisco to insert a delay between the RELEASE and > the DISCOVER of some length (though I don't remember the details). > > ----- Original Message ----- > > From: "Wayne Gemmell | Connect" <wa...@connect-mobile.co.za> > > To: "Users of ISC DHCP" <dhcp-users@lists.isc.org> > > Sent: Tuesday, June 14, 2022 9:50:00 AM > > Subject: Re: IP swapping for network restart or reboot for ubuntu client > > > We do run a primary fail-over setup and haven't tested it again as a > standalone > > host. > > > On Tue, 14 Jun 2022 at 15:41, Kraishak Mahtha < [ mailto: > kraishak....@gmail.com > > | kraishak....@gmail.com ] > wrote: > > >> Hi Wayne, > >> Thanks for sharing the link, > > >> I have observed that I am seeing this IP switch only if it is in a > >> primary-failover mode whereas if we run the DHCP server standalone we > do not > >> see any issue and the IP is being constant, by any chance did you try > this case > > >> On Tue, Jun 14, 2022 at 2:56 PM Kraishak Mahtha < [ > >> mailto:kraishak....@gmail.com | kraishak....@gmail.com ] > wrote: > > >>> * Observed in the Ubuntu version 20.04 > > >>> On Tue, Jun 14, 2022 at 2:39 PM Kraishak Mahtha < [ > >>> mailto:kraishak....@gmail.com | kraishak....@gmail.com ] > wrote: > > >>>> Hi all, > >>>> We are experiencing weird behavior with ISC's DHCP version 4.4.2. > When the > >>>> Wintel(windows) clients use the ISC DHCP servers that are operating > in a > >>>> primary-failover mode, then reboot or a renewal does not see any > address > >>>> shuffle. When the Ubuntu clients use the ISC DHCP servers, we are > observing a > >>>> periodic IP Address shuffle upon a reboot. This shuffling is not > observed when > >>>> we are using a Microsoft DHCP solution. We are interested to know if > this issue > >>>> is a known issue in the ISC database. If there is a workaround to > resolve this > >>>> issue, please let us know. > > >>>> Thanks in Advance > > >> -- > >> ISC funds the development of this software with paid support > subscriptions. > >> Contact us at [ https://www.isc.org/contact/ | > https://www.isc.org/contact/ ] > >> for more information. > > >> 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 ] > > > -- > > ISC funds the development of this software with paid support > subscriptions. > > Contact us at https://www.isc.org/contact/ for more information. > > > dhcp-users mailing list > > dhcp-users@lists.isc.org > > https://lists.isc.org/mailman/listinfo/dhcp-users > -- > ISC funds the development of this software with paid support > subscriptions. Contact us at https://www.isc.org/contact/ for more > information. > > 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/20220614/2e544546/attachment-0001.htm> ------------------------------ Message: 2 Date: Tue, 14 Jun 2022 13:47:18 -0400 (EDT) From: perl-list <perl-l...@network1.net> To: Users of ISC DHCP <dhcp-users@lists.isc.org> Subject: Re: IP swapping for network restart or reboot for ubuntu client Message-ID: <628790235.2640140.1655228838392.javamail.zim...@network1.net> Content-Type: text/plain; charset=utf-8 Could be still a similar problem that could be resolved in a similar way. Is the time between the RELEASE and DISCOVER extremely short (you will probably need to packet capture to find out)? ----- Original Message ----- > From: "Wayne Gemmell | Connect" <wa...@connect-mobile.co.za> > To: "Users of ISC DHCP" <dhcp-users@lists.isc.org> > Sent: Tuesday, June 14, 2022 10:01:29 AM > Subject: Re: IP swapping for network restart or reboot for ubuntu client > It is triggered with a netplan apply specifically in our case, no Cisco in > sight. > On Tue, 14 Jun 2022 at 15:57, perl-list < [ mailto:perl-l...@network1.net | > perl-l...@network1.net ] > wrote: >> Is this by chance in conjunction with Cisco's DHCP Proxy configuration? What >> we >> saw there was that the Cisco device inserted a RELEASE whenever a DISCOVER >> happened. The RELEASE was so close (< 5ms) on top of the subsequent DISCOVER >> that the DHCP server, in failover, did not have time to propagate the address >> being freed up and so a second address would be configured. We had to get >> Cisco >> to insert a delay between the RELEASE and the DISCOVER of some length >> (though I >> don't remember the details). >> ----- Original Message ----- >>> From: "Wayne Gemmell | Connect" < [ mailto:wa...@connect-mobile.co.za | >> > wa...@connect-mobile.co.za ] > >>> To: "Users of ISC DHCP" < [ mailto:dhcp-users@lists.isc.org | >> > dhcp-users@lists.isc.org ] > >> > Sent: Tuesday, June 14, 2022 9:50:00 AM >> > Subject: Re: IP swapping for network restart or reboot for ubuntu client >> > We do run a primary fail-over setup and haven't tested it again as a >> > standalone >> > host. >>> On Tue, 14 Jun 2022 at 15:41, Kraishak Mahtha < [ mailto: [ >> > mailto:kraishak....@gmail.com | kraishak....@gmail.com ] >> > | [ mailto:kraishak....@gmail.com | kraishak....@gmail.com ] ] > wrote: >> >> Hi Wayne, >> >> Thanks for sharing the link, >> >> I have observed that I am seeing this IP switch only if it is in a >> >> primary-failover mode whereas if we run the DHCP server standalone we do >> >> not >> >> see any issue and the IP is being constant, by any chance did you try >> >> this case >> >> On Tue, Jun 14, 2022 at 2:56 PM Kraishak Mahtha < [ >>>> mailto: [ mailto:kraishak....@gmail.com | kraishak....@gmail.com ] | [ >> >> mailto:kraishak....@gmail.com | kraishak....@gmail.com ] ] > wrote: >> >>> * Observed in the Ubuntu version 20.04 >> >>> On Tue, Jun 14, 2022 at 2:39 PM Kraishak Mahtha < [ >>>>> mailto: [ mailto:kraishak....@gmail.com | kraishak....@gmail.com ] | [ >> >>> mailto:kraishak....@gmail.com | kraishak....@gmail.com ] ] > wrote: >> >>>> Hi all, >> >>>> We are experiencing weird behavior with ISC's DHCP version 4.4.2. When >> >>>> the >> >>>> Wintel(windows) clients use the ISC DHCP servers that are operating in a >> >>>> primary-failover mode, then reboot or a renewal does not see any address >> >>>> shuffle. When the Ubuntu clients use the ISC DHCP servers, we are >> >>>> observing a >> >>>> periodic IP Address shuffle upon a reboot. This shuffling is not >> >>>> observed when >> >>>> we are using a Microsoft DHCP solution. We are interested to know if >> >>>> this issue >> >>>> is a known issue in the ISC database. If there is a workaround to >> >>>> resolve this >> >>>> issue, please let us know. >> >>>> Thanks in Advance >> >> -- >> >> ISC funds the development of this software with paid support >> >> subscriptions. >>>> Contact us at [ [ https://www.isc.org/contact/ | >>>> https://www.isc.org/contact/ ] >> >> | [ https://www.isc.org/contact/ | https://www.isc.org/contact/ ] ] >> >> for more information. >> >> dhcp-users mailing list >>>> [ mailto: [ mailto:dhcp-users@lists.isc.org | dhcp-users@lists.isc.org ] | >>>> [ >> >> 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 ] | >>>> [ https://lists.isc.org/mailman/listinfo/dhcp-users | >> >> https://lists.isc.org/mailman/listinfo/dhcp-users ] ] >> > -- >> > ISC funds the development of this software with paid support subscriptions. >>> Contact us at [ https://www.isc.org/contact/ | https://www.isc.org/contact/ >>> ] >> > for more information. >> > 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 ] >> -- >> ISC funds the development of this software with paid support subscriptions. >> Contact us at [ https://www.isc.org/contact/ | https://www.isc.org/contact/ ] >> for more information. >> 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 ] > -- > ISC funds the development of this software with paid support subscriptions. > Contact us at https://www.isc.org/contact/ for more information. > dhcp-users mailing list > dhcp-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/dhcp-users ------------------------------ Message: 3 Date: Tue, 14 Jun 2022 23:36:51 +0530 From: Kraishak Mahtha <kraishak....@gmail.com> To: Users of ISC DHCP <dhcp-users@lists.isc.org> Subject: Re: IP swapping for network restart or reboot for ubuntu client Message-ID: <caddat85a_wbpo-eedvqjjonhyuqrpwydsnaromtonnuxsyc...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Hi *Perl-list,* *I have been observing some weird behavior on packet capture, I am using the same command "netplan apply" and have been executing in the loop, I am getting the DHCP release packet for some trials only, and for other trials getting the discover packet directly bypassing the release packet I guess, My observation is it is swapping the IP only when we see the release packet.* *If anyone encounters the same behaviors and found a workaround please let me know* *Thanks in advance* On Tue, Jun 14, 2022 at 7:10 PM Kraishak Mahtha <kraishak....@gmail.com> wrote: > Hi Wayne, > > Thanks for sharing the link, > > I have observed that I am seeing this IP switch only if it is in a > primary-failover mode whereas if we run the DHCP server standalone we do > not see any issue and the IP is being constant, by any chance did you try > this case > > On Tue, Jun 14, 2022 at 2:56 PM Kraishak Mahtha <kraishak....@gmail.com> > wrote: > >> * Observed in the Ubuntu version 20.04 >> >> On Tue, Jun 14, 2022 at 2:39 PM Kraishak Mahtha <kraishak....@gmail.com> >> wrote: >> >>> Hi all, >>> We are experiencing weird behavior with ISC's DHCP version 4.4.2. When >>> the Wintel(windows) clients use the ISC DHCP servers that are operating in >>> a primary-failover mode, then reboot or a renewal does not see any address >>> shuffle. When the Ubuntu clients use the ISC DHCP servers, we are observing >>> a periodic IP Address shuffle upon a reboot. This shuffling is not observed >>> when we are using a Microsoft DHCP solution. We are interested to know if >>> this issue is a known issue in the ISC database. If there is a workaround >>> to resolve this issue, please let us know. >>> >>> Thanks in Advance >>> >> -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20220614/3c61c586/attachment.htm> ------------------------------ Subject: Digest Footer _______________________________________________ ISC funds the development of this software with paid support subscriptions. 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