[[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717215|dhcpd/KVM Bug]] beachten (( Lösungsmöglichkeiten um UDP Checksum-Problem zu vermeiden: 
  * in KVM e1000 als Netzwerkkarte auswählen, 
  * oder: TX offloading in der Netzwerkkarte ausschalten
  * oder: mit iptables die Checksumme erzeugen
))
===== Konfiguration dhcpd um Subnetz erweitern =====
''/etc/dhcp/dhcpd.conf'' : ( debian 6.0 )

''/etc/dhcpd.conf'' : ( openSuSE 12.1, centos 6 )
<file>
subnet 10.1.1.0 netmask 255.255.255.0 {
  range 10.1.1.10 10.1.1.20;
  option domain-name "sub.example.com";
  option routers 10.1.1.2;
  option broadcast-address 10.1.1.255;
  default-lease-time 600;
  max-lease-time 7200;
}

host vm3 {
  hardware ethernet 52:54:00:6f:2f:01;
  fixed-address 10.1.1.5;
}
</file>

===== Konfiguration relay =====
Paket: 
  * Debian 7: ''isc-dhcp-relay'' 

''/etc/default/isc-dhcp-relay'' :
<file>
SERVERS="192.168.226.3"

# On what interfaces should the DHCP relay (dhrelay) serve DHCP requests?
# leave blank or enter all incoming and outgoing interfaces
INTERFACES="" 

# Additional options that are passed to the DHCP relay daemon?
OPTIONS=""
</file>


  /usr/sbin/dhcrelay -d 192.168.226.3