A DHCP relay agent is any host that forwards DHCP packets between clients and servers.
- Relay agents are used to forward requests and replies between clients and servers when they are not on the same physical subnet.
- Relay agent forwarding is distinct from the normal forwarding of an IP router, where IP datagrams are switched between networks somewhat transparently.
- Relay agents receive DHCP messages and then generate a new DHCP message to send out on another interface.
- The Cisco IOS DHCP relay agent supports the use of unnumbered interfaces.
- The DHCP relay agent automatically adds a static host route specifying the unnumbered interface as the outbound interface
PacketTracer Lab: CCNA-5.3.b-Configure-and-verify-DHCP-on-a-router-Relay.pkt
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