I have a subnet, let's say 192.168.254.0/24 where the dhcp server is 192.168.254.1 and I want to give fixed ip addresses to the users in that subnet, by MAC addr., but I also need that a couple of workstations remain with the ip setup normally ( they don't need to get ips from dhcp, they should use preconfigured ips already setup on those machines). I have a squid server, a mail server and my computer that I don't want to depend on dhcp.
The three must not mix but they can coexist without problems. What I do is:
* Machines with statically-configured IP addresses, who do not even talk to the DHCP server, are all between 1 and 50
* Machines which are assigned static addresses by the DHCP server are given IP addresses between 51 and 100
* The DHCP server dynamically assigns addresses between 101 and 254 to any other computer that requests an IP address
Question: what will be the behaviour of the dhcp server in this situation and if necessary what option should I put in the config file for this scenario to work?
My current dhcpd.conf : ignore client-updates; subnet 192.168.254.0 netmask 255.255.255.0 { option routers 192.168.254.1; option domain-name "lglink.ro"; option domain-name-servers 192.168.254.1, 192.168.254.125; option broadcast-address 192.168.254.255; deny unknown-clients; default-lease-time 43200; max-lease-time 86400; # client1 host gelu { hardware ethernet 00:02:44:70:0D:80; fixed-address 192.168.254.11; } ...and so on...
It looks to me like you do not have a range for dynamic allocations, although perhaps you did that deliberately if I understood you above. Here is a FULL copy of my /etc/dhcpd.conf for your reference, and note that I write comments for which machines have static (non-DHCP) addresses so I don't mistakenly assign the same address to anyone else:
# Global parameters
authoritative;
option domain-name "casa.paiz.org"; option domain-name-servers 192.168.0.1; option routers 192.168.0.1;
option time-offset -21600; option ntp-servers 192.168.0.1;
max-lease-time 86400; default-lease-time 86400;
allow unknown-clients; deny bootp;
ddns-update-style none;
# Subnet declarations
shared-network CASA.PAIZ.ORG {
subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.101 192.168.0.254;
}
}group {
use-host-decl-names on;# 1 achilles host static
# 50 wap11-arriba network static
# 51 adan host dhcp
host adan {
hardware ethernet 00:50:ba:5d:6f:2c;
fixed-address 192.168.0.51;
}<EOF>
-- Rodolfo J. Paiz rpaiz@xxxxxxxxxxxxxx
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