DHCP relay
DHCP Relay provides a way for DHCP clients to communicate with DHCP servers that are not available on the same local subnet/broadcast domain. When you enable DHCP Relay, Magic WAN Connector forwards DHCP discover messages to a predefined DHCP server, and routes the responses back to the original device that sent the discover message.
flowchart LR
accTitle: An example of Connector in DHCP Relay mode
a(Magic WAN Connector) --> b(Internet) --> c(DHCP server)
subgraph Customer site
d[LAN 1] <--> a
e[LAN 2] <--> a
end
c --> a
classDef orange fill:#f48120,color: black
class a orange
The above graph shows Connector sending DHCP discover messages to a DHCP server offsite.
To configure DHCP relay:
- Log in to the Cloudflare dashboard ↗ and select your account.
- Go to Magic WAN > Sites.
- Select your site > Edit.
- Select Network.
- In LAN configuration, select the LAN where you need to configure DHCP relay.
- Select Edit.
- Select This is a DHCP Relay.
- In Upstream DHCP server addresses, enter the IP address of your DHCP server.
- (Optional) If you need to add more DHCP server addresses, select Add upstream DHCP server address as many times as needed, and enter the new values.
Create a PUT request to update the LAN where you want to enable DHCP relay:
Example:
curl --request PUT \https://api.cloudflare.com/client/v4/accounts/{account_id}/magic/sites/{site_id}/lans/{lan_id} \--header "X-Auth-Email: <EMAIL>" \--header "X-Auth-Key: <API_KEY>" \--header "Content-Type: application/json" \--data '{ "lan": { "static_addressing": { "dhcp_relay": { "server_addresses": [ "192.0.2.1" ] } } }}'