Im Prinzip ist das ein einziges /16-Netz und nicht viele kleine /24. Am besten du setzt einfach Ranges. Ich habs mal dahingehend umgebaut. Sollte so klappen. Gib mir mal Bescheid, obs läuft 
ddns-update-style none;
default-lease-time 315360000;
max-lease-time 315360000;
authoritative;
log-facility local7;
allow booting;
allow bootp;
next-server 10.18.1.1;
filename "/pxelinux.0";
subnet 10.18.0.0 netmask 255.255.0.0
{
option routers 10.18.1.1;
option domain-name-servers 10.18.1.1;
range 10.18.1.2 10.18.1.3; # Headless-Kiste
range 10.18.2.1 10.18.2.3; # Desktops
range 10.18.3.1 10.18.3.254; # Sonstige Leases
}
host xwing
{
hardware-ethernet 00:e0:c5:4e:81:2d;
fixed-adress 10.18.1.2;
}
host ywing
{
hardware ethernet b8:27:eb:8a:80:a4;
fixed-adress 10.18.1.3;
}
host darkstar
{
hardware ethernet bc:ae:c5:18:d7:60;
fixed-adress 10.18.2.1;
}
host voyager
{
hardware ethernet;
fixed-adress 10.18.2.2;
}
host valkyrie
{
hardware ethernet;
fixed-adress 10.18.2.3;
}
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Muss die Range unbedingt definieret werden? Ich hab hier mal ne angepasste Version, die mir allerdings auch Fehler gibt:
Config:
ddns-update-style none;
default-lease-time 315360000;
max-lease-time 315360000;
authoritative;
log-facility local7;
allow booting;
allow bootp;
next-server 10.18.1.1;
filename "/pxelinux.0";
subnet 10.18.0.0 netmask 255.255.0.0 {
range 10.18.3.1 10.18.3.254;
option subnet-mask 255.255.0.0;
option-routers 10.18.1.1;
}
host xwing {
hardware-ethernet 00:e0:c5:4e:81:2d;
fixed-address 10.18.1.2;
}
host ywing {
hardware ethernet b8:27:eb:8a:80:a4;
fixed-address 10.18.1.3;
}
host darkstar {
hardware ethernet bc:ae:c5:18:d7:60;
fixed-address 10.18.2.1;
}
host voyager {
hardware ethernet;
fixed-address 10.18.2.2;
}
host valkyrie {
hardware ethernet;
fixed-address 10.18.2.3;
}
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Fehlermeldung:
root@spacecube:/home/tobias# /etc/init.d/isc-dhcp-server start
dhcpd self-test failed. Please fix /etc/dhcp/dhcpd.conf.
The error was:
Internet Systems Consortium DHCP Server 4.2.2
Copyright 2004-2011 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
/etc/dhcp/dhcpd.conf line 15: semicolon expected.
option-routers 10.
^
/etc/dhcp/dhcpd.conf line 19: semicolon expected.
hardware-ethernet 00:
^
/etc/dhcp/dhcpd.conf line 20: semicolon expected.
fixed-adress 10.
^
/etc/dhcp/dhcpd.conf line 26: semicolon expected.
fixed-adress 10.
^
/etc/dhcp/dhcpd.conf line 36: semicolon expected.
fixed-adress 10.
^
/etc/dhcp/dhcpd.conf line 41: semicolon expected.
fixed-adress 10.
^
Configuration file errors encountered -- exiting
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Gruß tk