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Today's Topics:
1. Re: IP swapping for network restart or reboot for ubuntu
client (Wayne Gemmell | Connect)
2. Re: IP swapping for network restart or reboot for ubuntu
client (perl-list)
3. 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
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>
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------------------------------
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
>>>
>>
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