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Create DNS records for DHCP leases

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ℹ️ Info: This script can not be used on its own but requires the base installation. See main README for details.

Description

This script adds (and updates & removes) dns records based on dhcp server leases. An A record based on mac address is created for all bound lease, additionally a CNAME record is created from host name if available.

Requirements and installation

Just install the script:

$ScriptInstallUpdate dhcp-to-dns;

Then run it from dhcp server as lease script. You may want to use lease-script.

A scheduler cares about cleanup:

/system/scheduler/add interval=15m name=dhcp-to-dns on-event="/system/script/run dhcp-to-dns;" start-time=startup;

Configuration

On first run a disabled static dns record acting as marker (with comment "--- dhcp-to-dns above ---") is added. Move this entry to define where new entries are to be added.

The configuration goes to global-config-overlay, these are the parameters:

  • Domain: the domain used for dns records
  • HostNameInZone: whether or not to add the dhcp/dns server's hostname
  • PrefixInZone: whether or not to add prefix dhcp
  • ServerNameInZone: whether or not to add DHCP server name

Host name from DHCP lease comment

Overwriting the host name from dhcp lease comment is supported, just add something like hostname=new-hostname in comment, and separate it by comma from other information if required:

/ip/dhcp-server/lease/add address=10.0.0.50 comment="my device, hostname=new-hostname" mac-address=00:11:22:33:44:55 server=dhcp;

Note this information can be configured in wireless access list with dhcp-lease-comment, though it comes with a delay then due to script execution order. Decrease the scheduler interval to reduce the effect.

See also


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