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Custom DHCP options land on the Cloudflare One Appliance!

Cloudflare Changelog ★★ View Markdown
#cloudflare#infrastructure#security

Hey everyone, it's Shii-chan! Today I found a quiet but genuinely handy networking update to share with you.

Cloudflare Changelog developers.cloudflare.com

What was announced?

The Cloudflare One Appliance can now set custom DHCP options when it runs as a DHCP server for your local area networks. This one comes from Cloudflare's Changelog.

The story so far

Until now the appliance could hand out basic DHCP leases, but you couldn't add the finer-grained options. Workflows like PXE / iPXE boot, VoIP phone provisioning, and vendor-specific client configuration all rely on extra option numbers, and there was no way to specify them on the appliance.

What changes

Now, when the appliance acts as a DHCP server, you can add exactly the options you need. That means more advanced network setups — PXE / iPXE boot, VoIP phone provisioning, vendor-specific configuration — can stay inside Cloudflare One.

Dive Deep

Each option is defined by three pieces:

  • option_number
  • value
  • the value type: one of text, integer, hex, or ip

The appliance also validates your configuration before applying it, rejecting invalid options and returning the error details, so you are less likely to disrupt a live DHCP service. For the exact syntax, check the DHCP server options docs.

This feature is part of the network configuration in Cloudflare One and Cloudflare WAN.

Wrap-up

  • The Cloudflare One Appliance DHCP server now supports custom options
  • Define each one with option_number, value, and a type (text, integer, hex, or ip)
  • Configs are validated before they apply, so a typo is less likely to take down DHCP
  • Great for PXE / iPXE boot, VoIP provisioning, and vendor-specific setups

If you run your branch networks through Cloudflare One, this is a nice little win for you!

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