Dhcpd.conf - Options Precedence

[Niall O'Reilly]

On 5 Apr 2006, at 21:50, Kelvin Williams wrote:
> Have I missed a keyword in my configuration to tell it to apply the  
> options
> within the host declaration, PLUS any in the subnet/pool declaration?

On 6 Apr 2006, at 03:09, Chuck Anderson wrote:
> Fixed-address assignments aren't
> part of pools, so they don't get the pool options.

Chuck is right.

An example may help.  We use the following structure, which has been  
working
for a number of years.  We have 353 pools in 136 subnets on 123  
shared-networks,
thus mainly one subnet on each shared-network.  We also (still!) have  
many
thousands of fixed-address hosts.

# Global options
     option domain-name "example.net";
     use-host-decl-names on;
     option domain-name-servers 192.168.116.39, 192.168.105.22,  
192.168.70.28;
     option tftp-server-address code 150 = ip-address;
     ddns-update-style none;
# Roaming hosts -- we want to treat them as "known" in pools  
( >15,000 of these )
     host kleeylbr { hardware ethernet 00:00:00:00:00:01; }
     host wjoydre { hardware ethernet 00:00:00:01:66:83; }
     host g0bs4-541 { hardware ethernet 00:00:00:60:9b:5d; }
# Shared network (there are many shared networks)
     shared-network bf-coa-arts {
         subnet 192.168.163.0 netmask 255.255.255.0 {
             option subnet-mask 255.255.255.0;
             option routers 192.168.163.1;
# Fixed hosts -- inherit from subnet, shared-network, global
# These use reserved addresses, not covered by any pool
             host ws-bmc-0l02 {
                 hardware ethernet 00:20:a6:55:eb:80;
                 fixed-address 192.168.163.17;
             }
             host ih230i01 {
                 hardware ethernet 00:01:e6:b0:6b:b6;
                 fixed-address 192.168.163.20;
# Lease pool -- inherit from subnet, shared-network, global
             pool {
                 range 192.168.163.129 192.168.163.254;
                 deny unknown clients;
                 max-lease-time 7200;
             }
         }
# Other subnet on same LAN (shared-network)
         subnet 10.137.163.0 netmask 255.255.255.0 {
             option subnet-mask 255.255.255.0;
             option routers 10.137.163.1;
# No fixed addresses here, just a pool
             pool {
                 range 10.137.163.129 10.137.163.254;
                 deny known clients;
                 max-lease-time 7200;
             }
         }
     }
# ... and so on for the other shared-networks

IHTH



Best regards,

Niall O'Reilly
University College Dublin Computing Services

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