To have various IP ranges in the same subnet and assign the IP Address depending of the device type that sends the request.

[Juan Antonio García Moreno]

Hi Simon,

Too much thanks by your anotation about the Hosts Declarations. I will keep
them in mind and I will change it.

About the Hosts Classifications, I have tested this and works for me:

------------------------------------------------------------------------------
class "smartphones" {
  match if substring(option vendor-class-identifier,0,13) = "android-dhcp-"
or
           substring(option vendor-class-identifier,0,7) = "HUAWEI:" or
           substring(option vendor-class-identifier,0,7) = "dhcpcd-";
}
------------------------------------------------------------------------------

That is the same that this:

------------------------------------------------------------------------------
class "smartphones" {
  match option vendor-class-identifier;
}

subclass "smartphones" "android-dhcp-9"
subclass "smartphones" "android-dhcp-8.1.0"
subclass "smartphones" "android-dhcp-7.0"
subclass "smartphones" "HUAWEI:android:FIG-L11"
subclass "smartphones" "HUAWEI:android:QC_Reference_Phone"
subclass "smartphones" "dhcpcd-5.5.6"
------------------------------------------------------------------------------

And I can change it to:

------------------------------------------------------------------------------
class "smartphones" {
  match option vendor-class-identifier;
}

include smartphones.cfg

* smartphones.cfg file containing the subclass lines.
------------------------------------------------------------------------------

But, is there any way to minimize the number of lines to include in the
smartphones.cfg file using some kind of wildcard or expression/function
like "substring()" used in the Class Declaration?

Another question:

The iPhones and the iPads not send the "vendor-class-identifier" option in
the DHCP Discover Packet.

Could I classify iPhones and iPads taking into account some other parameter
of the DHCP Discover Packet?


Best regards



El lun., 5 ago. 2019 a las 19:35, Simon Hobson (<dhcp1 at thehobsons.co.uk>)
escribió:

> Juan Antonio García Moreno <jagarcia at 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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> dhcp-users at lists.isc.org
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>


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