Figure 11.2 Bootp Requests; Figure 11.3 Bootp Replies - Samsung Ubigate iBG3026 Configuration Manual

CHAPTER 11. DHCP Relay
Functionality
The DHCP relay feature uses BOOTP requests and replies to negotiate packet
delivery between the DHCP client and server.
BOOTP Requests and Replies
BOOTP Requests
BOOTP requests are messages from client to server. Request messages include
DHCP DISCOVER, DHCP REQUEST, DHCP RELEASE, etc. The relay
agent modifies the packet header by adding relay information to the DHCP
gateway address(giaddr) field. The server replies to the gateway address
specified in the packet's giaddr field.
DHCP Client
BOOTP Replies
BOOTP replies are messages from the server to the client. Reply messages
include DHCP OFFER, DHCP ACK, DHCP NAK, etc. The relay agent looks
up the MAC address and either sends the packet to the client or broadcasts it
on the LAN.
DHCP Client
90
Broadcast BOOTEQUEST
DHCP Relay Agent

Figure 11.2 BOOTP Requests

Unicast Broadcast
BOOTEQUEST
DHCP Relay Agent

Figure 11.3 BOOTP Replies

Unicast BOOTEQUEST
DHCP Server
Unicast
BOOTEQUEST
DHCP Server
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