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Create DNS records for DHCP leases
==================================
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> ℹ ️
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> installation. See [main README](../README.md) for details.
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Description
-----------
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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.
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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 ](lease-script.md ).
A scheduler cares about cleanup:
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/system/scheduler/add interval=15m name=dhcp-to-dns on-event="/system/script/run dhcp-to-dns;" start-time=startup;
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Configuration
-------------
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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.
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The configuration goes to dhcp server's network definition. The domain is
used to form the dns name:
/ip/dhcp-server/network/add address=10.0.0.0/24 domain=example.com;
A bound lease for mac address `00:11:22:33:44:55` with ip address
`10.0.0.50` would result in an A record `00-11-22-33-44-55.example.com`
pointing to the given ip address.
Additional options can be given from comment, to add an extra level in
dns name or define a different domain.
/ip/dhcp-server/network/add address=10.0.0.0/24 domain=example.com comment="domain=another-domain.com, name-extra=dhcp";
This example would result in name `00-11-22-33-44-55.dhcp.another-domain.com`
for the same lease.
If no domain is found in dhcp server's network definition a fallback from
`global-config-overlay` is used. This is the parameter:
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* `Domain` : the domain used for dns records
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> ℹ ️
> [`global-config`](../global-config.rsc) (the one without `-overlay`) to
> your local `global-config-overlay` and modify it to your specific needs.
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### 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 ](dhcp-lease-comment.md ), though it comes with a delay
then due to script execution order. Decrease the scheduler interval to
reduce the effect.
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See also
--------
* [Collect MAC addresses in wireless access list ](collect-wireless-mac.md )
* [Comment DHCP leases with info from access list ](dhcp-lease-comment.md )
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* [Create DNS records for IPSec peers ](ipsec-to-dns.md )
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* [Run other scripts on DHCP lease ](lease-script.md )
---
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