One DHCP Server, Multiple routed subnets, roaming clients

[James Jalbert]

But I also do not want to assign multiple fixed addresses in the host deceleration.

James Jalbert
Network Administrator
Caribou School Department
Phone: 207-493-4246
E-Mail: jjalbert at caribouschools.org



>>> "Glen R. J. Neff" <neff_glen at emc.com> 10/27/2009 2:05 PM >>>
If I'm reading what you want correctly, that you don't want unknown 
machines assigned any address, it should be as simple as removing the 
range statement from each subnet declaration.

For a testing lab, I have a dhcpd config with 1000s of static 
assignments over dozens of subnets with no range statements and it works 
swimmingly.

-G


James Jalbert wrote:
> I am sure that this has been asked, and answered, but I can not find the solution anywhere. I have a DHCP server in my main building. This building also connects to 6 other building through a WAN. I have one DHCP Server (Ubuntu server9.04, DHCP 3.1) with multiple subnet decelerations, and one large host file, added with an include. Everything works great. I have machines that roam between buildings, and as long as I use comma separated fixed address, everything works great.
> Now I would like to be able to set up the server so that, if a machine has a deceleration with a fixed address, but is requesting an ip form another building, it would be assigned a dynamic address, however if there is no Host deceleration(an unknown client) it will not be assigned any address. 
> 
> Here is a sample of my config so far:
> 
> ddns-domainname "foo";
> ddns-rev-domainname "in-addr.arpa";
> ddns-update-style interim;
> ddns-updates on;
> max-lease-time 86400;
> default-lease-time 86400;
> option domain-name-servers 10.11.0.4, 130.111.xx.xx, 130.111.xx.xx;
> option domain-name "foo";
> deny unknown-clients;
> deny client-updates;
> allow duplicates;
> authoritative;
> update-static-leases on;
> 
> ## All hosts go here
> include "/etc/dhcp3/ip.hosts";
> 
> 
> # Main-Building
> subnet 10.11.0.0 netmask 255.255.248.0 {
> 	option routers 10.11.0.1;
> 	range 10.11.5.1 10.11.7.254;
> 	}
> # Building1
> subnet 10.11.8.0 netmask 255.255.252.0 {
> 	option routers 10.11.8.1;
> 	range 10.11.11.2 10.11.11.254;
> 	}
> #Building2
> subnet 10.11.12.0 netmask 255.255.254.0 {
> 	option routers 10.11.12.1;
> 	}
> # Building3
> subnet 10.11.14.0 netmask 255.255.254.0 {
> 	option routers 10.11.14.1;
> 	}
> # Building4
> subnet 10.11.16.0 netmask 255.255.255.0 {
> 	allow unknown-clients;
> 	option routers 10.11.16.1;
> 	range 10.11.16.100 10.11.16.243;
> 	}
> # Building5
> subnet 10.11.17.0 netmask 255.255.255.0 {
> 	option routers 10.11.17.1;
> 	}
> # Building6
> subnet 10.11.18.0 netmask 255.255.254.0 {
> 	option routers 10.11.18.1;
> 	}
> In the main building, I can add allow unknown-clients, and any one who walks in can get an address, such as seen in building4, without unknown-clients only address are handed out to host in the host file. The big hurdle is I only want our company's machines to be registered, I do not want anyone walking in off the street to be assigned an address, but if an employee goes from the main building to building 3, they would get an address in that subnet.
> 
> Here are a few host decelerations:
> 
> # RoamingSystem1
> host RoamingSystem1 {
> 	hardware ethernet 00:25:4B:9B:28:F1;
> 	fixed-address 10.11.0.170,10.11.8.104,10.11.14.175,10.11.19.7,10.11.12.181;
> 	ddns-hostname "RoamingSystem1";
> 	option host-name "RoamingSystem1";
> }
> 
> # RoamingSystem1-Wireless
> host RoamingSystem1-Wireless {
> 	hardware ethernet 00:25:4B:D1:70:94;
> 	fixed-address 10.11.0.170,10.11.8.104,10.11.14.175,10.11.19.7,10.11.12.181;
> 	ddns-hostname "RoamingSystem1-Wireless";
> 	option host-name "RoamingSystem1-Wireless";
> }
> 
> # System1-might-roam
> host System1 {
> 	hardware ethernet 00:1F:F3:D8:BA:EF;
> 	fixed-address 10.11.3.110;
> 	ddns-hostname "system1";
> 	option host-name "system1";
> }
> 
> 
> James Jalbert
> Network Administrator
> Caribou School Department
> Phone: 207-493-4246
> E-Mail: jjalbert at caribouschools.org 
> 
> 
> 
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> dhcp-users mailing list
> dhcp-users at lists.isc.org 
> https://lists.isc.org/mailman/listinfo/dhcp-users 
> 

-- 
/*
  * Glen R. J. Neff
  * RTP TSG Network Team
  * neff_glen at emc.com 
  *
  * EMC^2 == E^2
  */

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