Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen gezeigt.

--- fortgeschrittene:dhcp [2010/11/08 20:57]
127.0.0.1 Externe Bearbeitung
+++ fortgeschrittene:dhcp [2025/07/13 10:27] (aktuell)
@@ Zeile 1: / Zeile 1: @@
-====== DHCP-Dienst mit festen IP-Adressen ======
+====== DHCP4-Dienst mit festen IPv4-Adressen ======
-''/etc/dhcpd.conf'' :
+[[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717215|dhcpd/KVM Bug]] beachten (( Lösungsmöglichkeiten um UDP Checksum-Problem in KVM zu vermeiden:
+  * in KVM e1000 als Netzwerkkarte auswählen,
+  * oder: TX offloading in der Netzwerkkarte ausschalten
+  * oder: mit iptables die Checksumme erzeugen
+))
+===== Pakete =====
+Debian (ab 6.0):
+  isc-dhcp-server
+openSuSE (ab 12.1):
+  dhcp-server
+centos (6) :
+  dhcp
+===== Konfiguration =====
+''/etc/dhcp/dhcpd.conf'' : ( debian ab 6.0 )
+''/etc/dhcpd.conf'' : ( openSuSE 12.1, centos 6 )
 <file>
 authoritative;
 ddns-update-style none;
-log-facility local7;
 subnet 192.168.1.0 netmask 255.255.255.0 {
-  option domain-name-servers 192.168.1.4;
   option domain-name "linuxhotel.de";
   option routers 192.168.1.1;
@@ Zeile 14: / Zeile 29: @@
   default-lease-time 600;
   max-lease-time 7200;
 }
 use-host-decl-names on;
-host notebook03 {
+host notebook24 {
-  hardware ethernet 00:a0:cc:d5:52:e4;
+  hardware ethernet 00:16:d3:b9:a0:3e;
-  fixed-address 192.168.1.203;
+  fixed-address 192.168.1.224;
-  option domain-name-servers 192.168.1.6;
 }
+</file>
-host notebook06 {
+=== Debian ab 6.0 ===
-  hardware ethernet 00:a0:cc:d5:53:0c;
+''/etc/default/isc-dhcp-server'' :
-  fixed-address 192.168.1.206;
+<file>
-}
+INTERFACES="eth0"
 </file>
@@ Zeile 35: / Zeile 49: @@
 <file>
 DHCPD_INTERFACE="eth0"
-DHCPD_RUN_CHROOTED="yes"
-DHCPD_RUN_AS="dhcpd"
 </file>
-=== CentOS ===
+=== CentOS (bis 6) ===
 ''/etc/sysconfig/dhcpd'' :
 <file>
@@ Zeile 47: / Zeile 59: @@
 ===== Testen =====
-=== Debian ===
+=== Debian, CentOS 5.3 ===
-  dhcpd3 -t
+  dhcpd -t
 === SuSE ===
   rcdhcpd check-syntax
-=== CentOS 5.3 ===
+===== starten =====
+=== openSuSE (ab 12.1) ===
+  service dhcpd start
+  chkconfig dhcpd on
+=== debian (ab 6.0) ===
+  service isc-dhcp-server restart
+=== centos (ab 7) ===
+  service dhcpd start
+===== Client testen =====
+Optional: Interface mit passender Mac-Adresse anlegen: [[admin_grundlagen:macvlan]]
+DHCP Anfrage ohne Änderung:
+=== Debian (ab 6.0) Ubuntu (18.04) ===
+  dhclient -d -sf /bin/true eth0
+oder
+  dhclient -d -sf /usr/bin/env eth0
+Unter Ubuntu 18.04 läuft dhclient in einem [[AppArmor]]-Käfig (confinement) und kann daher ''/bin/true'' und ''/usr/bin/env'' nicht ausführen. [[AppArmor|Lösung]]
+=== openSuSE (12.3) ===
+  dhcpcd --test eth0
+=== openSuSE (ab 42.1) ===
+  /usr/lib/wicked/bin/wickedd-dhcp4 --test eth0
+====== IP-Adress-Pool ======
+<file txt /etc/dhcp/dhcpd.conf>
+subnet 192.168.227.0 netmask 255.255.255.0 {
+  range 192.168.227.50 192.168.227.69;
+  …
+  log-threshold-high 80;
+  log-threshold-low 50;
+}
+</file>
   dhcpd -t
+  service isc-dhcp-server restart
+  dhclient -d -sf /bin/true eth0
+  dhcp-lease-list
+====== Clientseitiges DNS über DHCP konfigurieren ======
+<file txt /etc/dhcp/dhcpd.conf>
+option domain-name "z03.example.org";
+option domain-name-servers 192.168.202.13;
+option domain-search "linuxhotel.de", "z03.example.org";
+</file>
+====== DHCP Client ======
+===== DHCP Server Optionen überschreiben =====
+Beispiel: eigene DNS-Informationen in die ''resolv.conf'' eintragen
+<file txt /etc/dhcp/dhclient.conf>
+supersede domain-name "z03.test";
+supersede domain-name-servers 192.168.203.101;
+</file>
 ====== Tools ======
   * [[ http://www.webmin.com | Webmin - incl. DHCP und DNS Modul ]] ( in Debian Sarge enthalten, in Etch nicht mehr )
@@ Zeile 64: / Zeile 128: @@
-====== mehrere Domains per DHCP =====
-''dhcpd.conf'':
+====== DHCP Failover ======
+Debian 5.0
+( noch nicht getestet )
+  mv /etc/dhcp3/dhcpd.conf /etc/dhcp3/dhcpd.common.conf
+  scp /etc/dhcp3/dhcpd.common.conf notebook25.linuxhotel.de:/etc/dhcp3/dhcpd.common.conf
+===== dhcpd.common.conf =====
+''/etc/dhcp3/dhcpd.common.conf'' :
 <file>
-domain-name "main.domain"
+subnet 192.168.1.0 netmask 255.255.255.0 {
-domain-search "additional.domain"
+  pool {
+    failover peer "dhcp-failover";
+    range 192.168.1.100 192.168.1.189;
+  }
+  option domain-name "linuxhotel.de";
+  option domain-name-servers 192.168.1.4, 192.168.1.6;
+  option routers 192.168.1.1;
+  option broadcast-address 192.168.1.255;
+}
+</file>
+===== Primary =====
+''/etc/dhcp3/dhcpd.conf'' :
+<file>
+failover peer "dhcp-failover" {
+  primary ; # declare this to be the primary server
+  address notebook20.linuxhotel.de;
+  port 520;
+  peer address notebook25.linuxhotel.de;
+  peer port 520;
+  max-response-delay 60;
+  max-unacked-updates 10;
+  load balance max seconds 3;
+  mclt 1800;
+  split 128;
+}
+include "/etc/dhcp3/dhcpd.common.conf";
+</file>
+  /etc/init.d/dhcp3-server restart
+===== Secondary =====
+  /etc/init.d/dhcp3-server stop
+''/etc/dhcp3/dhcpd.conf'' :
+<file>
+failover peer "dhcp-failover" {
+  secondary;
+  address notebook25.linuxhotel.de;
+  port 520;
+  peer address notebook20.linuxhotel.de;
+  peer port 520;
+  max-response-delay 60;
+  max-unacked-updates 10;
+  load balance max seconds 3;
+}
+include "/etc/dhcp3/dhcpd.common.conf";
 </file>
+  rm /var/lib/dhcp3/dhcpd.leases~
+  > /var/lib/dhcp3/dhcpd.leases
+  /etc/init.d/dhcp3-server start
+Sekunden entsprechend mclt Eintrag warten ...
-With 3.1.0, if the domain-search option is set, then the search directive is set to this. If the domain-name option is set, this is prepended to the list of domains in the domain-search option.
+===== Primary oder Secondary syncronisieren =====
+z.B. nach ''Got POOLREQ, answering negatively!  Peer may be out of leases or database inconsistent'' im Log ...
+  /etc/init.d/dhcp3-server stop
+  rm /var/lib/dhcp3/dhcpd.leases~
+  > /var/lib/dhcp3/dhcpd.leases
+  /etc/init.d/dhcp3-server start
+Sekunden entsprechend mclt Eintrag warten ...

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