[DHCP] group ip ranges

[Ken Appell]

This is great. Thanks!

Ashley M. Kirchner wrote:
> Ken Appell wrote:
>> I have a small network with different appliances on it that all 
>> connect to the same DHCP server to get their IP addresses. In order 
>> to simplify maintenance, I'd like to group the IP addresses according 
>> to appliance type. I know my example below doesn't work, but is there 
>> another way to do it?
>
>    At the office, I group machines by department and give them a 
> specific range.  This way when I see an IP on the network, I know what 
> department it belongs to.  Here's a snippet of one such "group":
>
> authoritative;
> option routers              192.168.1.1;
> option broadcast-address    192.168.1.255;
> option subnet-mask          255.255.255.0;
> option domain-name-servers  192.168.1.1;
> deny unknown-clients;
>
> class "digital_rats" {
>  match pick-first-value (option dhcp-client-identifier, hardware);
> }
> group {
>  ddns-hostname = pick (option host-name,  
> concat("dhcp-",binary-to-ascii(16,8,"-",substring(hardware,1,6))));
>
>  use-host-decl-names on;
>  host server_1  { hardware ethernet 00:0A:95:7C:E7:34;
>                   ddns-hostname server_1; }
>  host server_2  { hardware ethernet 00:03:93:53:BE:58;
>                   ddns-hostname server_2; }
>  host server_3  { hardware ethernet 00:0D:93:4A:8A:64;
>                   ddns-hostname server_3; }
>  host server_4  { hardware ethernet 00:0A:95:E8:CE:4A;
>                   ddns-hostname server_4; }
> }
> subclass "digital_rats" 1:00:0A:95:7C:E7:34;
> subclass "digital_rats" 1:00:03:93:53:BE:58;
> subclass "digital_rats" 1:00:0D:93:4A:8A:64;
> subclass "digital_rats" 1:00:0A:95:E8:CE:4A;
>
> # ... define more classes and groups here ...
>
> subnet 192.168.1.0 netmask 255.255.255.0 {
>  # Digital Rats
>  pool {
>    allow members of "digital_rats";
>    range 192.168.1.21 192.168.1.40
>  }
>
> # ... add more pools here, each one corresponding to a class/group 
> above ...
> }
>
>
>
>    As I mentioned, this allows me to designate all the machines within 
> a department to have a specific range of IP.  I would suspect you 
> could do the same for your setup and define your appliances in a 
> class/group and then set the appropriate pools for them.
>