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diff --git a/doc/antora/modules/howto/pages/protocols/dhcp/prepare.adoc b/doc/antora/modules/howto/pages/protocols/dhcp/prepare.adoc new file mode 100644 index 0000000..aa43530 --- /dev/null +++ b/doc/antora/modules/howto/pages/protocols/dhcp/prepare.adoc @@ -0,0 +1,59 @@ +== Preparation + +It is necessary to consider the requirements for the installation in order to +devise an efficient and manageable set up. + +=== Understand the network topology + +When multiple networks (VLANs) are in use consideration must be given to how +the correct "pool" (IP address ranges) from which to allocate addresses is +identified. + +The policy for setting specific DHCP options (e.g. lease time, default gateway, +time server and vendor-specific parameters) for different groups of hosts, +based on their network or some device attributes either supplied in the DHCP +requests or determined by dynamic lookup, should be well defined and +understood. + +Other DHCP servers may implement implicit assumptions about the requirement of +your network topology and silently define particular behaviours, such as the +selection of IP address pool for a request based on a relay address. Some of +these behaviours must be specifed explicitly when using FreeRADIUS. + +=== Choose a database backend + +FreeRADIUS stores its leases in an SQL database, so one of the key decisions to +make is which database to use. + +FreeRADIUS supports: + + * SQLite + * PostgreSQL + * MySQL / MariaDB + * Microsoft SQL Server + * Oracle + +In most configurations the SQL database is likely to be the limiting component +that restricts the IP allocation throughput of the overall system. Each +database server has its own performance characteristics and unique approach to +features such as high-availability. + +The choice of database should be made carefully based on the performance and +high-availability requirements of the system, as well as any prior experience. + +[TIP] +==== +SQLite is an in-process database that uses the local file system, is simple to +configure and is suitable for smaller installations. However, users with larger +address pools or high availability requirements should choose one of the other +standalone databases based on criteria such as performance, features, +familiarity and your need for commercial support. +==== + +FreeRADIUS ships with a default database schema and set of queries for each +supported database. These are sufficient for most DHCP deployments but can be +reviewed and modified as required to suit a particular situation, for example +to customise the IP allocation policy such as by disabling address +"stickiness". + +Now xref:protocols/dhcp/enable.adoc[enable the DHCP service]. |