I think I have everything configured correctly, but still keep getting these in the messages file of my DHCP server (IP, MAC, server names changed). This is eventually going to be a System Imager server as well, hence a single static IP assignment for now, to be expanded later.

May 6 06:00:48 dhcp-server dhcpd: DHCPDISCOVER from 00:11:22:33:44:55 via 123.123.80.2: network 123.123.80/23: no free leases


Here is my /etc/dhcpd.conf file

# DHCP Server Configuration file.
# see /usr/share/doc/dhcp*/dhcpd.conf.sample
#
########### GLOBAL SETTINGS ##################
ddns-update-style interim;
allow booting;
allow bootp;
class "pxeclients" {
match if substring(option vendor-class-identifier, 0, 9) = PXEClient";
next-server 123.123.145.40;
filename "linux-install/pxelinux.0";
}

#option option-140 code 140 = text;

############# END GLOBAL SETTINGS #############

subnet 123.123.145.0 netmask 255.255.255.128 {
range 123.123.145.42 123.123.145.44;
default-lease-time 3600;
max-lease-time 4800;
option routers 123.123.145.1;
option subnet-mask 255.255.255.128;
option domain-name "us.you.com us.youandme.com";
option domain-name-servers 123.123.130.65, 123.123.130.64;
}

subnet 123.123.152.0 netmask 255.255.254.0 {
default-lease-time 3600;
max-lease-time 4800;
option routers 123.123.152.1;
option subnet-mask 255.255.254.0;
option domain-name "us.you.com us.youandme.com";
option domain-name-servers 123.123.130.31, 123.123.130.32;
}

subnet 123.123.40.0 netmask 255.255.254.0 {
default-lease-time 3600;
max-lease-time 4800;
option routers 123.123.40.1;
option subnet-mask 255.255.254.0;
option domain-name "us.you.com us.youandme.com";
option domain-name-servers 123.123.130.31, 123.123.130.32;
}

subnet 123.123.16.0 netmask 255.255.252.0 {
default-lease-time 3600;
max-lease-time 4800;
option routers 123.123.16.1;
option subnet-mask 255.255.252.0;
option domain-name "us.you.com us.youandme.com";
option domain-name-servers 123.123.130.31, 123.123.130.32;
}

subnet 123.123.80.0 netmask 255.255.254.0 {
default-lease-time 3600;
max-lease-time 4800;
option routers 123.123.80.1;
option subnet-mask 255.255.254.0;
option domain-name-servers 123.123.130.64, 123.123.130.65;
}


group {
use-host-decl-names on;
filename "pxelinux.0";


host host5 {
hardware ethernet 00:11:22:33:44:55;
fixed-address 123.123.145.43;
option host-name "host5";
filename "pxelinux.0";
}

}

I did some more testing on this. I think the problem is that the static IP I am trying to assign is in the 123.123.145.x network but due to the way networking is setup the incoming DHCPREQUEST seems to be coming from the 123.123.80.x network. Due to which my static IP assignment, which is in the 123.123.145.x network doesn't work. If I change my static IP assignment to 123.123.80.43, for example, it works fine.

So I guess if I can force the DHCP severs to allow me a x.x.145.x IP assignment for a request coming from x.x.80.x network, or somehow mask the incoming DHCPREQUEST as coming from x.x.145.x I can make it work.

Any opinions or advice?