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====Topology====
====Topology====
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DHCP server network settings:
LAN IP/subnet: 192.168.4.1/24
DHCP Relay network settings:
DHCP Relay network settings:
WAN IP: 192.168.4.194
WAN IP: 192.168.4.194
DHCP server network settings:
The DHCP relay service enables the forwarding of DHCP broadcast messages to network segments that a client computer is not directly connected to. It allows a single DHCP server to be shared across different logical network segments separated by a firewall. Unlike handling IP addresses, the DHCP relay service sends unicast messages rather than broadcast messages.
When a client needs a DHCP-assigned IP address, it broadcasts a request to the network attached to its interface. The DHCP relay service on the firewall intercepts this request on an interface connected to the same network, such as LAN 192.168.2.0/24. The relay service then unicasts the request to all configured DHCP servers in the LAN and receives an IP address offer from a DHCP server (e.g., 192.168.4.1) that has a range of addresses configured for the client's network segment (e.g., 192.168.2.0/24). This offer is forwarded to the client. If the client accepts the offer, it acknowledges the DHCP address and assigns it to its interface immediately.
[[File:DHCP_RELAY_9.png|border|class=tlt-border| center]]
[[File:DHCP_RELAY_10.png|border|class=tlt-border| center]]
===Configuration===
===Configuration===
