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DNS and DHCP

Network > DNS & DHCP configures the DHCP server that gives addresses to your devices and the DNS service that resolves names for them.

DHCP​

Each interface with a static address can serve DHCP. For each one you set:

SettingMeaning
EnabledTurns the server on for the interface
RangeThe first and last address handed out, or the start and the number of addresses
Lease timeHow long a device keeps an address before asking again. Use values such as 45m, 12h, 2d, 1w or infinite. The default is one hour for IPv4
OptionsExtra DHCP options sent to clients, for example a different gateway or a DNS server

The range must fit inside the network of the interface.

Static leases​

A static lease always gives the same address to a device. The device is identified by its MAC address, and you can also give it a name. Use static leases for printers, servers and anything you want to reach at a fixed address.

Dynamic leases​

The Dynamic leases view lists the addresses currently in use: the device, its address and when the lease ends.

Scan the network​

The Scan network tool discovers devices on an interface. It is available only for interfaces with a network of /20 or smaller.

MAC binding​

You can restrict an interface so that only devices with a static lease receive service. Combined with a strict policy, this keeps unknown devices off the network.

DNS​

The unit acts as a resolver for its networks.

SettingMeaning
ForwardersUpstream DNS servers for names the unit does not know. Use /domain/server to send queries for a domain to a specific server
Local domainThe suffix added to names of DHCP clients. The default is lan
Rebind protectionDrops answers from the internet that point to private addresses, which stops an attack where a browser is used to probe your network
Log queriesRecords DNS queries in the system log

If your WAN uses a static address, configure at least one forwarder.

Local DNS records​

Records map a name to an address for your local network. They are not needed for hosts with static leases. Use them for names that point to another host, or for wildcard records, which answer for a domain and all its subdomains.