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Merge pull request #159 from jjakob/master
Draft: Edit DHCPv4/v6 server documentation, ...
This commit is contained in:
Christian Poessinger
GitHub
commit
c9d1f7a6ee
@ -9,39 +9,33 @@ VyOS uses ISC DHCPd for both IPv4 and IPv6 address assignment.
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DHCP Server
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DHCP Server
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===========
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===========
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Multiple DHCP Servers can be run from a single machine. Each DHCP service is
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The network topology is declared by shared-network-name and the subnet declarations.
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identified by a ``shared-network-name``.
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The DHCP service can serve multiple shared networks, with each shared network having 1 or more subnets.
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Each subnet must be present on an interface.
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A range can be declared inside a subnet to define a pool of dynamic addresses.
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Multiple ranges can be defined and can contain holes.
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Static mappings can be set to assign "static" addresses to clients based on their MAC address.
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Basic Example
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Basic Example
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-------------
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-------------
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We are offering address space in the 192.0.2.0/24 network, which is
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In this example, we are offering address space in the 192.0.2.0/24 network.
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physically connected on eth1, and pppoe0 is our connection to the internet.
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We are using the network name `dhcpexample`.
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We are using the network name ``<name>``.
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Prerequisites:
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* Configuring PPPoE interface is assumed to be done already, and appears
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on `pppoe0`
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* Interface ``eth1`` is configured to be connected to our DHCP subnet
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192.0.2.0/24 by assigning e.g. address 192.0.2.1/24.
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Multiple DHCP ranges can be defined and may contain holes.
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.. code-block:: none
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.. code-block:: none
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set service dhcp-server shared-network-name '<name>' authoritative
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set service dhcp-server shared-network-name dhcpexample authoritative
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set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 default-router 192.0.2.1
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set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 default-router 192.0.2.1
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set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 dns-server 192.0.2.1
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set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 dns-server 192.0.2.1
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set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 lease 86400
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set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 lease 86400
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set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 range 0 start 192.0.2.100
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set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 range 0 start 192.0.2.100
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set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 range 0 stop 192.0.2.199
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set service dhcp-server shared-network-name dhcpexample 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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The generated config will look like:
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.. code-block:: none
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.. code-block:: none
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vyos@vyos# show service dhcp-server shared-network-name '<name>'
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vyos@vyos# show service dhcp-server shared-network-name dhcpexample
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authoritative
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authoritative
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subnet 192.0.2.0/24 {
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subnet 192.0.2.0/24 {
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default-router 192.0.2.1
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default-router 192.0.2.1
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@ -53,23 +47,22 @@ The generated config will look like:
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}
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}
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}
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}
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Explanation
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Explanation
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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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.. cfgcmd:: set service dhcp-server shared-network-name dhcpexample authoritative
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This says that this device is the only DHCP server for this network. If other
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This says that this device is the only DHCP server for this network. If other
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devices are trying to offer DHCP leases, this machine will send 'DHCPNAK' to
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devices are trying to offer DHCP leases, this machine will send 'DHCPNAK' to
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any device trying to request an IP address that is
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any device trying to request an IP address that is
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not valid for this network.
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not valid for this network.
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.. cfgcmd:: set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 default-router 192.0.2.1
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.. cfgcmd:: set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 default-router 192.0.2.1
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This is a configuration parameter for the subnet, saying that as part of the
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This is a configuration parameter for the subnet, saying that as part of the
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response, tell the client that I am the default router for this network
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response, tell the client that I am the default router for this network
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.. cfgcmd:: set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 dns-server 192.0.2.1
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.. cfgcmd:: set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 dns-server 192.0.2.1
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This is a configuration parameter for the subnet, saying that as part of the
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This is a configuration parameter for the subnet, saying that as part of the
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response, tell the client that I am the DNS server for this network. If you
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response, tell the client that I am the DNS server for this network. If you
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@ -77,20 +70,20 @@ do not want to run a DNS server, you could also provide one of the public
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DNS servers, such as google's. You can add multiple entries by repeating the
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DNS servers, such as google's. You can add multiple entries by repeating the
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line.
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line.
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.. cfgcmd:: set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 lease 86400
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.. cfgcmd:: set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 lease 86400
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Assign the IP address to this machine for 24 hours. It is unlikely you'd need
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Assign the IP address to this machine for 24 hours. It is unlikely you'd need
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to shorten this period, unless you are running a network with lots of devices
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to shorten this period, unless you are running a network with lots of devices
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appearing and disappearing.
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appearing and disappearing.
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.. cfgcmd:: set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 range 0 start 192.0.2.100
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.. cfgcmd:: set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 range 0 start 192.0.2.100
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Make a range of addresses available for clients starting from .100 [...]
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Make a range of addresses available for clients starting from .100 [...]
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.. cfgcmd:: set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 range 0 stop 192.0.2.199
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.. cfgcmd:: set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 range 0 stop 192.0.2.199
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[...] and ending at .199
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[...] and ending at .199.
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Failover
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Failover
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--------
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--------
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@ -115,7 +108,7 @@ A generic name referencing this sync service.
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.. cfgcmd:: set service dhcp-server shared-network-name 'LAN' subnet '192.0.2.0/24' failover status '{primary|secondary}'
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.. cfgcmd:: set service dhcp-server shared-network-name 'LAN' subnet '192.0.2.0/24' failover status '{primary|secondary}'
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The primary and secondary statements determines whether the server is primary
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The primary and secondary statements determines whether the server is primary
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r secondary.
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or secondary.
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.. note:: In order for the primary and the secondary DHCP server to keep
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.. note:: In order for the primary and the secondary DHCP server to keep
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their lease tables in sync, they must be able to reach each other on TCP
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their lease tables in sync, they must be able to reach each other on TCP
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@ -134,16 +127,18 @@ Static mappings
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You can specify a static DHCP assignment on a per host basis. You will need the
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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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MAC address of the station and your desired IP address. The address must be
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inside your subnet definition but can be outside of your range sttement.
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inside the subnet definition but can be outside of the range statement.
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.. cfgcmd:: set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 static-mapping <host> ip-address 192.0.2.10
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.. cfgcmd:: set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 static-mapping static-mapping-01 mac-address ff:ff:ff:ff:ff:ff
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Configure desired IPv4 address for your host referenced to as `host`.
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Each host is uniquely identified by its MAC address.
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.. cfgcmd:: set service dhcp-server shared-network-name '<name>' subnet 192.0.2.0/24 static-mapping <hodt> mac-address ff:ff:ff:ff:ff:ff
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.. cfgcmd:: set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 static-mapping static-mapping-01 ip-address 192.0.2.10
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Configure MAC address for your host referenced by as `host` used in this static
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IP address to assign to this host. It must be inside the subnet in which it is defined but can be outside the dynamic range.
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assignment.
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If ip-address is not specified, an IP from the dynamic pool (as specified by ``range``) is used. This is useful, for example, in combination with hostfile update.
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.. hint:: This is the equivalent of the host block in dhcpd.conf of isc-dhcpd.
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DHCP Options
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DHCP Options
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------------
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------------
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@ -170,6 +165,209 @@ The domain-name parameter should be the domain name used when completing DNS
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request where no full FQDN is passed. This option can be given multiple times
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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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if you need multiple search domains (DHCP Option 119).
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.. list-table::
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:header-rows: 1
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:stub-columns: 0
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:widths: 12 7 23 40 20
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* - Setting name
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- Option number
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- ISC-DHCP Option name
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- Option description
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- Multi
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* - client-prefix-length
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- 1
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- subnet-mask
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- Specifies the clients subnet mask as per RFC 950. If unset, subnet declaration is used.
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- N
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* - time-offset
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- 2
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- time-offset
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- Offset of the client's subnet in seconds from Coordinated Universal Time (UTC)
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- N
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* - default-router
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- 3
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- routers
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- IPv4 address of router on the client's subnet
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- N
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* - time-server
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- 4
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- time-servers
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- RFC 868 time server IPv4 address
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- Y
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* - dns-server
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- 6
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- domain-name-servers
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- DNS server IPv4 address
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- Y
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* - domain-name
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- 15
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- domain-name
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- Client domain name
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- Y
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* - ip-forwarding
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- 19
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- ip-forwarding
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- Enable IP forwarding on client
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- N
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* - ntp-server
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- 42
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- ntp-servers
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- IP address of NTP server
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- Y
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* - wins-server
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- 44
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- netbios-name-servers
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- NetBIOS over TCP/IP name server
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- Y
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* - server-identifier
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- 54
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- dhcp-server-identifier
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- IP address for DHCP server identifier
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- N
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* - bootfile-server
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- siaddr
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- next-server
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- IPv4 address of next bootstrap server
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- N
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* - tftp-server-name
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- 66
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- tftp-server-name
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- Name or IPv4 address of TFTP server
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- N
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* - bootfile-name
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- 67
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- bootfile-name, filename
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- Bootstrap file name
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- N
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* - smtp-server
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- 69
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- smtp-server
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- IP address of SMTP server
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- Y
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* - pop-server
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- 70
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- pop-server
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- IP address of POP3 server
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- Y
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* - domain-search
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- 119
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- domain-search
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- Client domain search
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- Y
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* - static-route
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- 121, 249
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- rfc3442-static-route, windows-static-route
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- Classless static route
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- N
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* - wpad-url
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- 252
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- wpad-url, wpad-url code 252 = text
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- Web Proxy Autodiscovery (WPAD) URL
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- N
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* - lease
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-
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- default-lease-time, max-lease-time
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- Lease timeout in seconds (default: 86400)
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- N
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* - range
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-
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- range
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- DHCP lease range
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- Y
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* - exclude
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-
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-
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- IP address to exclude from DHCP lease range
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- Y
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* - failover
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-
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-
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- DHCP failover parameters
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-
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* - static-mapping
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-
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-
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- Name of static mapping
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- Y
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Multi: can be specified multiple times.
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Raw parameters
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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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.. code-block:: none
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set service dhcp-server shared-network-name dhcpexample shared-network-parameters
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<text> Additional shared-network parameters for DHCP server.
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set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 subnet-parameters
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<text> Additional subnet parameters for DHCP server.
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set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 static-mapping example static-mapping-parameters
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<text> Additional static-mapping parameters for DHCP server.
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Will be placed inside the "host" block of the mapping.
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These parameters are passed as-is to isc-dhcp's dhcpd.conf under the configuration node they are defined in.
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They are not validated so an error in the raw parameters won't be caught by vyos's scripts and will cause dhcpd to fail to start.
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Always verify that the parameters are correct before commiting the configuration.
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Refer to isc-dhcp's dhcpd.conf manual for more information:
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https://kb.isc.org/docs/isc-dhcp-44-manual-pages-dhcpdconf
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Example
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^^^^^^^
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.. opcmd:: set service dhcp-server shared-network-name dhcpexample subnet 192.0.2.0/24 static-mapping example static-mapping-parameters "option domain-name-servers 192.0.2.11, 192.0.2.12;"
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Override the static-mapping's dns-server with a custom one that will be sent only to this host.
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Operation Mode
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--------------
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.. opcmd:: restart dhcp server
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Restart the DHCP server
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.. opcmd:: show dhcp server statistics
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Show the DHCP server statistics:
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.. code-block:: none
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vyos@vyos:~$ show dhcp server statistics
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Pool Size Leases Available Usage
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----------- ------ -------- ----------- -------
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dhcpexample 99 2 97 2%
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.. opcmd:: show dhcp server statistics pool <pool>
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Show the DHCP server statistics for the specified pool.
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.. opcmd:: show dhcp server leases
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Show statuses of all active leases:
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.. code-block:: none
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vyos@vyos:~$ show dhcp server leases
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IP address Hardware address State Lease start Lease expiration Remaining Pool Hostname
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-------------- ------------------ ------- ------------------- ------------------- ---------- ----------- ---------
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192.0.2.104 aa:bb:cc:dd:ee:ff active 2019/12/05 14:24:23 2019/12/06 02:24:23 6:05:35 dhcpexample test1
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192.0.2.115 ab:ac:ad:ae:af:bf active 2019/12/05 18:02:37 2019/12/06 06:02:37 9:43:49 dhcpexample test2
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.. hint:: Static mappings aren't shown. To show all states, use ``show dhcp server leases state all``.
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.. opcmd:: show dhcp server leases pool <pool>
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Show only leases in the specified pool.
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.. opcmd:: show dhcp server leases sort <key>
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Sort the output by the specified key. Possible keys: ip, hardware_address, state, start, end, remaining, pool, hostname (default = ip)
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.. opcmd:: show dhcp server leases state <state>
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Show only leases with the specified state. Possible states: all, active, free, expired, released, abandoned, reset, backup (default = active)
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DHCPv6 Server
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DHCPv6 Server
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||||||
=============
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=============
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@ -268,16 +466,16 @@ be created. The following example explains the process.
|
|||||||
**Example:**
|
**Example:**
|
||||||
|
|
||||||
* IPv6 address ``2001:db8::101`` shall be statically mapped
|
* IPv6 address ``2001:db8::101`` shall be statically mapped
|
||||||
* Device MAC address will be ``00:53:c5:b7:5e:23``
|
|
||||||
* Host specific mapping shall be named ``client1``
|
* Host specific mapping shall be named ``client1``
|
||||||
|
|
||||||
.. hint:: The MAC address identifier is defined by the last 4 byte of the
|
.. hint:: The identifier is the device's DUID: colon-separated hex list (as used by isc-dhcp option dhcpv6.client-id).
|
||||||
MAC address.
|
If the device already has a dynamic lease from the DHCPv6 server, its DUID can be found with ``show service dhcpv6 server leases``.
|
||||||
|
The DUID begins at the 5th octet (after the 4th colon) of IAID_DUID.
|
||||||
|
|
||||||
.. code-block:: none
|
.. code-block:: none
|
||||||
|
|
||||||
set service dhcpv6-server shared-network-name 'NET1' subnet 2001:db8::/64 static-mapping client1 ipv6-address 2001:db8::101
|
set service dhcpv6-server shared-network-name 'NET1' subnet 2001:db8::/64 static-mapping client1 ipv6-address 2001:db8::101
|
||||||
set service dhcpv6-server shared-network-name 'NET1' subnet 2001:db8::/64 static-mapping client1 identifier c5b75e23
|
set service dhcpv6-server shared-network-name 'NET1' subnet 2001:db8::/64 static-mapping client1 identifier 00:01:00:01:12:34:56:78:aa:bb:cc:dd:ee:ff
|
||||||
|
|
||||||
The configuration will look as follows:
|
The configuration will look as follows:
|
||||||
|
|
||||||
@ -294,12 +492,11 @@ The configuration will look as follows:
|
|||||||
}
|
}
|
||||||
static-mapping client1 {
|
static-mapping client1 {
|
||||||
ipv6-address 2001:db8::101
|
ipv6-address 2001:db8::101
|
||||||
identifier c5b75e23
|
identifier 00:01:00:01:12:34:56:78:aa:bb:cc:dd:ee:ff
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
Operation Mode
|
Operation Mode
|
||||||
--------------
|
--------------
|
||||||
|
|
||||||
@ -315,6 +512,27 @@ To show the current status of the DHCPv6 server.
|
|||||||
|
|
||||||
Show statuses of all assigned leases:
|
Show statuses of all assigned leases:
|
||||||
|
|
||||||
|
.. code-block:: none
|
||||||
|
|
||||||
|
vyos@vyos:~$ show dhcpv6 server leases
|
||||||
|
IPv6 address State Last communication Lease expiration Remaining Type Pool IAID_DUID
|
||||||
|
------------- ------- -------------------- ------------------- ----------- ------------- ----- --------------------------------------------
|
||||||
|
2001:db8::101 active 2019/12/05 19:40:10 2019/12/06 07:40:10 11:45:21 non-temporary NET1 98:76:54:32:00:01:00:01:12:34:56:78:aa:bb:cc:dd:ee:ff
|
||||||
|
2001:db8::102 active 2019/12/05 14:01:23 2019/12/06 02:01:23 6:06:34 non-temporary NET1 87:65:43:21:00:01:00:01:11:22:33:44:fa:fb:fc:fd:fe:ff
|
||||||
|
|
||||||
|
.. hint:: Static mappings aren't shown. To show all states, use ``show dhcp server leases state all``.
|
||||||
|
|
||||||
|
.. opcmd:: show dhcpv6 server leases pool <pool>
|
||||||
|
|
||||||
|
Show only leases in the specified pool.
|
||||||
|
|
||||||
|
.. opcmd:: show dhcpv6 server leases sort <key>
|
||||||
|
|
||||||
|
Sort the output by the specified key. Possible keys: expires, iaid_duid, ip, last_comm, pool, remaining, state, type (default = ip)
|
||||||
|
|
||||||
|
.. opcmd:: show dhcpv6 server leases state <state>
|
||||||
|
|
||||||
|
Show only leases with the specified state. Possible states: abandoned, active, all, backup, expired, free, released, reset (default = active)
|
||||||
|
|
||||||
DHCP Relay
|
DHCP Relay
|
||||||
==========
|
==========
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user