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Today's Topics:
1. Re: To have various IP ranges in the same subnet and assign
the IP Address depending of the device type that sends the
request. (Simon Hobson)
----------------------------------------------------------------------
Message: 1
Date: Mon, 5 Aug 2019 18:35:33 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: To have various IP ranges in the same subnet and assign
the IP Address depending of the device type that sends the request.
Message-ID: <5b4b5489-3138-45c4-8629-2af1bc1f7...@thehobsons.co.uk>
Content-Type: text/plain; charset=utf-8
Juan Antonio Garc?a Moreno <jagar...@emergya.com> wrote:
> I relly have some hosts declarations, but I don't have put these in the post.
Ah yes, about that ... see below !
> subnet 10.53.0.0 netmask 255.255.0.0 {
>
> default-lease-time 86400;
> max-lease-time 172800;
>
> option broadcast-address 10.53.255.255;
> option routers 10.53.1.1;
>
> # Unknown Clients Range.
> pool {
> deny members of "smartphones";
> range 10.53.33.1 10.53.35.254;
> }
>
> # Smartphones Range.
> pool {
> allow members of "smartphones";
> range 10.53.10.2 10.53.11.254;
> }
>
> host PC-01 {
> hardware ethernet ff:ff:ff:ff:ff:01;
> fixed-address 10.53.100.5;
> }
>
> host PC-02 {
> hardware ethernet ff:ff:ff:ff:ff:02;
> fixed-address 10.53.100.6;
> }
>
> }
That is another common mistake. Host declarations are always global in scope
even though you might think that putting them inside a subnet declaration would
tie them to that subnet. So even though declared inside one subnet, they will
be "known" in any subnet - which in itself can cause considerable confusion.
But what really makes life "interesting" (see
https://en.wikipedia.org/wiki/May_you_live_in_interesting_times) is that should
a host be connected to a different network, it will inherit option values from
the subnet where it is defined. Thus you find yourself with a client that's
been given an address by DHCP, but the gateway address it's been given is in a
completely different subnet !
> And too, howto fill a text file with the "vendor-class-identifier" of the
> smartphones and include in the DHCP Server config to match the smartphones
> devices too.
It's a simple scripting exercise to take a text file containing one string per
line, and build a config file snippet. You can then use an include statement to
incorporate that config snippet into the daemon config.
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