mirror of
https://github.com/opnsense/docs
synced 2024-11-05 06:00:36 +00:00
43 lines
2.3 KiB
ReStructuredText
43 lines
2.3 KiB
ReStructuredText
====
|
|
DHCP
|
|
====
|
|
|
|
DHCP is used to automatically provide clients with an IP address (instead of clients having to set one themselves).
|
|
DHCP is available for both IPv4 and IPv6 clients, referred to as DHCPv4 and DHCPv6, respectively.
|
|
|
|
-----------------
|
|
Settings overview
|
|
-----------------
|
|
|
|
DHCPv4 settings can be found at :menuselection:`Services --> DHCPv4`. DHCPv6 settings can be found at :menuselection:`Services --> DHCPv6`.
|
|
|
|
The DHCPv4 submenu further consists of:
|
|
|
|
* An entry per interface of general settings, like a toggle to enable/disable DHCPv4 for this interface, DHCP range, DNS servers…
|
|
* **Relay**: DHCP requests can be "forwarded" to another server. This is called relaying.
|
|
* **Leases**: Shows all IP addresses that are handed out to clients (can be filtered to only show active and static leases).
|
|
* **Log File**: Shows the log file of the DHCPv4 server.
|
|
|
|
The DHCPv6 submenu further consists of:
|
|
|
|
* **Relay**: DHCP requests can be "forwarded" to another server. This is called relaying.
|
|
* **Leases**: Shows all IP addresses that are handed out to clients (can be filtered to only show active and static leases).
|
|
|
|
------------
|
|
Using DHCPv4
|
|
------------
|
|
|
|
A typical DHCPv4 usage scenario is using it on your LAN with an IP range of 192.168.1.x, where x can be a number from 1
|
|
through 254. This means a subnet mask of 255.255.255.0. The range can also be written as 192.168.1.0/24. (The “1” in
|
|
the third group can also be another number, and there are also other ranges available for private use. These are
|
|
described in `RFC 1918 <https://tools.ietf.org/html/rfc1918#section-3>`_.)
|
|
|
|
The LAN IP of the OPNsense device that serves DHCP to the LAN should fall in the same DHCP IP range. Typically, it gets
|
|
the address ending in .1 (so 192.168.1.1) in this example.
|
|
|
|
To set the LAN IP, go to :menuselection:`Interfaces --> [LAN]`, set “IPv4 Configuration Type” to “Static”, and under
|
|
“Static IPv4 configuration”, set “IPv4 address” to ``192.168.1.1`` and the subnet dropdown to “24”. Then click Save.
|
|
|
|
To set the DHCP settings, go to :menuselection:`Services --> DHCPv4 --> [LAN]`. Under “Gateway”, put ``192.168.1.1``. Under range,
|
|
put ``192.168.1.100`` as the start address and ``192.168.1.200`` as the end address. Then click Save. After saving,
|
|
click the “Apply Settings” button. |