Either the Smoothwall Filter and Firewall isn't relaying DHCP addresses out or the devices requesting the DHCP addresses aren't receiving the IP addresses.
- Set the Smoothwall Filter and Firewall as the default gateway for the DHCP server. Typically, by using an internal IP address to communicate on. Note this IP address must be on a different subnet to the subnet used by DHCP requesting clients.
- Make sure that the Smoothwall Filter and Firewall has a route to the networks it is relaying for.
- If the Smoothwall's internal IP address is not used for the DHCP server's default gateway, ensure the DHCP server has a route to the networks so it can act as a fallback for DHCP address requests.