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Today's Topics:
1. multiple ?hardware ethernet? for the same IP address
(Vincent LE NEZET)
2. Re: multiple ?hardware ethernet? for the same IP address
(Peter Yardley)
----------------------------------------------------------------------
Message: 1
Date: Wed, 15 Feb 2023 15:07:08 +0100
From: Vincent LE NEZET <vincent.le.ne...@ens.psl.eu>
To: dhcp-users@lists.isc.org
Subject: multiple ?hardware ethernet? for the same IP address
Message-ID: <3a3b0705-5bef-fa33-bfa4-aadd682aa...@ens.psl.eu>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Hello,
I have a question about the support of multiple mac address for the same
IP in isc-dhcp-server.
The user support team register client's mac address in the dhcp.
So that clients always have the same IP address, they create two ?host?
blocks in the conf with the same IP, but two differents mac : one for
the ethernet card of the PC and one for the dock on the user's desk.
Given that it could result in an address conflict, it surprises me that
isc-dhcp accept this. Is it because of a RFC ?
However I don't find anything in RFCs nor in the isc doc which could
explain this.
Could you help me ?
thanks and have a good day
--
vincent le nezet
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Message: 2
Date: Thu, 16 Feb 2023 14:04:31 +1100
From: Peter Yardley <peter.martin.yard...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: multiple ?hardware ethernet? for the same IP address
Message-ID: <2bdcd865-3929-4c09-b85a-bf450fa98...@gmail.com>
Content-Type: text/plain; charset=utf-8
Hi,
I used to do this to speed change overs of one our large blocks of fixed IP
machines. Have both old and new mac addresses, when the old machines were
switched off and the new ones switched on, magic it all worked (if we got the
MACs correct).
> On 16 Feb 2023, at 1:07 am, Vincent LE NEZET <vincent.le.ne...@ens.psl.eu>
> wrote:
>
>
> Hello,
>
> I have a question about the support of multiple mac address for the same IP
> in isc-dhcp-server.
>
> The user support team register client's mac address in the dhcp.
>
> So that clients always have the same IP address, they create two ?host?
> blocks in the conf with the same IP, but two differents mac : one for the
> ethernet card of the PC and one for the dock on the user's desk.
>
> Given that it could result in an address conflict, it surprises me that
> isc-dhcp accept this. Is it because of a RFC ?
>
> However I don't find anything in RFCs nor in the isc doc which could explain
> this.
>
> Could you help me ?
>
> thanks and have a good day
>
> --
> vincent le nezet
>
> --
> 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
Peter Yardley
peter.martin.yard...@gmail.com
------------------------------
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End of dhcp-users Digest, Vol 171, Issue 7
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