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dhcp: restructure chapters
This commit is contained in:
Christian Poessinger
parent
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commit
2f58753cdf
@ -70,8 +70,10 @@ on specific addresses only.
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set service ssh port '22'
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Configure DHCP/DNS Servers
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##########################
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.. _dhcp-dns-quick-start:
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DHCP/DNS quick-start
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####################
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The following settings will configure DHCP and DNS services on your internal/LAN network,
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where VyOS will act as the default gateway and DNS server.
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@ -1,15 +1,16 @@
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.. _dhcp:
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#############
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DHCP / DHCPv6
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#############
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VyOS uses ISC DHCPd for both IPv4 and IPv6 address assignment.
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.. _dhcp-server:
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###########
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DHCP Server
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===========
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###########
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VyOS uses ISC DHCP server for both IPv4 and IPv6 address assignment.
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***********
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IPv4 server
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***********
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The network topology is declared by shared-network-name and the subnet
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declarations. The DHCP service can serve multiple shared networks, with each
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@ -20,7 +21,7 @@ mappings can be set to assign "static" addresses to clients based on their MAC
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address.
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Configuration
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-------------
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=============
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.. cfgcmd:: set service dhcp-server shared-network-name <name> authoritative
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@ -77,9 +78,8 @@ Configuration
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request where no full FQDN is passed. This option can be given multiple times
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if you need multiple search domains (DHCP Option 119).
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Failover
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^^^^^^^^
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--------
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VyOS provides support for DHCP failover. DHCP failover must be configured
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explicitly by the following statements.
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@ -115,9 +115,8 @@ explicitly by the following statements.
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that the failover partnership is immune to disruption (accidental or
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otherwise) via third parties.
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Static mappings
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^^^^^^^^^^^^^^^
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---------------
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You can specify a static DHCP assignment on a per host basis. You will need the
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MAC address of the station and your desired IP address. The address must be
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@ -140,9 +139,8 @@ inside the subnet definition but can be outside of the range statement.
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.. hint:: This is the equivalent of the host block in dhcpd.conf of isc-dhcpd.
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Options
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^^^^^^^
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=======
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.. list-table::
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:header-rows: 1
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@ -272,9 +270,8 @@ Options
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Multi: can be specified multiple times.
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Raw Parameters
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^^^^^^^^^^^^^^
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==============
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Raw parameters can be passed to shared-network-name, subnet and static-mapping:
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@ -299,44 +296,15 @@ Quotes can be used inside parameter values by replacing all quote characters
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with the string ``"``. They will be replaced with literal quote characters
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when generating dhcpd.conf.
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Example
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^^^^^^^
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Quick-Start
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"""""""""""
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* We are offering address space in the `192.0.2.0/24` network.
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* We are using the network name `mypool`.
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.. code-block:: none
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set service dhcp-server shared-network-name mypool authoritative
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set service dhcp-server shared-network-name mypool subnet 192.0.2.0/24 default-router 192.0.2.1
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set service dhcp-server shared-network-name mypool subnet 192.0.2.0/24 dns-server 192.0.2.1
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set service dhcp-server shared-network-name mypool subnet 192.0.2.0/24 lease 86400
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set service dhcp-server shared-network-name mypool subnet 192.0.2.0/24 range 0 start 192.0.2.100
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set service dhcp-server shared-network-name mypool subnet 192.0.2.0/24 range 0 stop 192.0.2.199
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The generated config will look like:
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.. code-block:: none
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vyos@vyos# show service dhcp-server shared-network-name mypool
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authoritative
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subnet 192.0.2.0/24 {
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default-router 192.0.2.1
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dns-server 192.0.2.1
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lease 86400
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range 0 {
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start 192.0.2.100
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stop 192.0.2.199
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}
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}
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=======
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Please see the :ref:`dhcp-dns-quick-start` configuration.
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Failover
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""""""""
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--------
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Configuration of a DHCP failover pair
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* Setup DHCP failover for network 192.0.2.0/24
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* Default gateway and DNS server is at `192.0.2.254`
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@ -344,37 +312,38 @@ Failover
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* The secondary DHCP server uses address `192.168.189.253`
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* DHCP range spans from `192.168.189.10` - `192.168.189.250`
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**Primary**
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Common configuration, valid for both primary and secondary node.
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.. code-block:: none
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 default-router '192.0.2.254'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 dns-server '192.0.2.254'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 domain-name 'vyos.net'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 range 0 start '192.0.2.10'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 range 0 stop '192.0.2.250'
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**Primary**
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.. code-block:: none
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 failover local-address '192.168.189.252'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 failover name 'NET-VYOS'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 failover peer-address '192.168.189.253'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 failover status 'primary'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 range 0 start '192.0.2.10'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 range 0 stop '192.0.2.250'
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**Secondary**
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.. code-block:: none
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 default-router '192.0.2.254'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 dns-server '192.0.2.254'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 domain-name 'vyos.net'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 failover local-address '192.168.189.253'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 failover name 'NET-VYOS'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 failover peer-address '192.168.189.252'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 failover status 'primary'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 range 0 start '192.0.2.10'
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set service dhcp-server shared-network-name NET-VYOS subnet 192.0.2.0/24 range 0 stop '192.0.2.250'
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Raw Parameters
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""""""""""""""
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--------------
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* Override static-mapping's dns-server with a custom one that will be sent only
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to this host.
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@ -390,9 +359,8 @@ Raw Parameters
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set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 static-mapping example static-mapping-parameters "option pxelinux.configfile "pxelinux.cfg/01-00-15-17-44-2d-aa";"
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Operation Mode
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--------------
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==============
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.. opcmd:: restart dhcp server
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@ -442,14 +410,15 @@ Operation Mode
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Show only leases with the specified state. Possible states: all, active,
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free, expired, released, abandoned, reset, backup (default = active)
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DHCPv6 Server
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=============
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***********
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IPv6 server
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***********
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VyOS also provides DHCPv6 server functionality which is described in this
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section.
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Configuration Options
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---------------------
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Configuration
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=============
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.. cfgcmd:: set service dhcpv6-server preference <preference value>
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@ -490,7 +459,7 @@ Configuration Options
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A SNTP server address can be specified for DHCPv6 clients.
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Prefix Delegation
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^^^^^^^^^^^^^^^^^
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-----------------
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To hand out individual prefixes to your clients the following configuration is
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used:
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@ -541,7 +510,7 @@ The configuration will look as follows:
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}
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Static mappings
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^^^^^^^^^^^^^^^
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---------------
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In order to map specific IPv6 addresses to specific hosts static mappings can
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be created. The following example explains the process.
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@ -583,7 +552,7 @@ The configuration will look as follows:
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}
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Operation Mode
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--------------
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==============
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.. opcmd:: restart dhcpv6 server
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@ -622,8 +591,9 @@ Operation Mode
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Show only leases with the specified state. Possible states: abandoned,
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active, all, backup, expired, free, released, reset (default = active)
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##########
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DHCP Relay
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==========
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##########
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If you want your router to forward DHCP requests to an external DHCP server
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you can configure the system to act as a DHCP relay agent. The DHCP relay
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@ -631,8 +601,12 @@ agent works with IPv4 and IPv6 addresses.
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All interfaces used for the DHCP relay must be configured.
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**********
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IPv4 relay
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**********
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Configuration
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-------------
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=============
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.. cfgcmd:: set service dhcp-relay interface <interface>
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@ -648,30 +622,6 @@ Configuration
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The router should discard DHCP packages already containing relay agent
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information to ensure that only requests from DHCP clients are forwarded.
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Example
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-------
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* Listen for DHCP requests on interface ``eth1``.
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* DHCP server is located at IPv4 address 10.0.1.4.
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* Router receives DHCP client requests on ``eth1`` and relays them to the server at 10.0.1.4.
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.. figure:: /_static/images/service_dhcp-relay01.png
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:scale: 80 %
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:alt: DHCP relay example
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DHCP relay example
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The generated configuration will look like:
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.. code-block:: none
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show service dhcp-relay
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interface eth1
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server 10.0.1.4
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relay-options {
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relay-agents-packets discard
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}
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Options
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-------
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@ -703,18 +653,43 @@ Options
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* **replace:** Relay information already present in a packet is stripped and
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replaced with the router's own relay information set.
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Example
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=======
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* Listen for DHCP requests on interface ``eth1``.
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* DHCP server is located at IPv4 address 10.0.1.4.
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* Router receives DHCP client requests on ``eth1`` and relays them to the server at 10.0.1.4.
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.. figure:: /_static/images/service_dhcp-relay01.png
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:scale: 80 %
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:alt: DHCP relay example
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DHCP relay example
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The generated configuration will look like:
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.. code-block:: none
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show service dhcp-relay
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interface eth1
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server 10.0.1.4
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relay-options {
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relay-agents-packets discard
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}
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Operation
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---------
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=========
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.. opcmd:: restart dhcp relay-agent
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Restart DHCP relay service
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DHCPv6 relay
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============
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**********
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IPv6 relay
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**********
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Configuration
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-------------
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=============
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.. cfgcmd:: set service dhcpv6-relay listen-interface <interface>
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@ -727,8 +702,20 @@ Configuration
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Specifies an upstream network `<interface>` from which replies from `<server>`
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and other relay agents will be accepted.
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Options
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-------
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.. cfgcmd:: set service dhcpv6-relay max-hop-count 'count'
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Set maximum hop count before packets are discarded, default: 10
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.. cfgcmd:: set service dhcpv6-relay use-interface-id-option
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If this is set the relay agent will insert the interface ID. This option is
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set automatically if more than one listening interfaces are in use.
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Example
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^^^^^^^
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=======
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* DHCPv6 requests are received by the router on `listening interface` ``eth1``
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* Requests are forwarded through ``eth2`` as the `upstream interface`
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@ -752,24 +739,8 @@ The generated configuration will look like:
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address 2001:db8::4
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}
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Options
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-------
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.. cfgcmd:: set service dhcpv6-relay max-hop-count 'count'
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Set maximum hop count before packets are discarded, default: 10
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.. cfgcmd:: set service dhcpv6-relay use-interface-id-option
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If this is set the relay agent will insert the interface ID. This option is
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set automatically if more than one listening interfaces are in use.
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Operation
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---------
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.. opcmd:: show dhcpv6 relay-agent status
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Show the current status of the DHCPv6 relay agent:
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=========
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.. opcmd:: restart dhcpv6 relay-agent
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