![]() Also, we see in the DHCP Option Field section the various options being sent by the server along with the IP address. Note the CHADDR field still contains the physical address of the requesting client. The YIADDR field is populated with the IP address the server is offering the client. The DHCP section identifies the packet as an Offer. In the IP section of the capture excerpt below, the Source address is now the DHCP server IP address, and the Destination address is the broadcast address 255.255.255.255. The DHCP server responds by sending a DHCPOFFER packet. IP: Data: Number of data bytes remaining = 308 (0x0134)ĭHCP: Hardware Type (htype) = 1 (0x1) 10Mb EthernetĭHCP: Hardware Address Length (hlen) = 6 (0圆)ĭHCP: Transaction ID (xid) = 556223005 (0x21274A1D)ĭHCP: Client IP Address (ciaddr) = 0.0.0.0ĭHCP: Server IP Address (siaddr) = 0.0.0.0ĭHCP: Relay IP Address (giaddr) = 0.0.0.0ĭHCP: Client Ethernet Address (chaddr) = 08002B2ED85EĭHCP: Client-identifier = (Type: 1) 08 00 2b 2e d8 5eĭHCP: Parameter Request List = (Length: 7) 01 0f 03 2c 2e 2f 06 Note the values in the CHADDR field and the DHCP: Client Identifier field are identical. The DHCP section identifies the packet as a Discover packet and identifies the client in two places using the physical address of the network card. In the IP section, you can see the Destination address is 255.255.255.255 and the Source address is 0.0.0.0. The following is an excerpt from a network monitor capture showing the IP and DHCP portions of a DHCPDISCOVER packet. The detailed conversation between DHCP client and DHCP server is as follows: DHCPDISCOVER MAC addr MAC addr IP addr IP addr DescriptionĬlient Broadcast 0.0.0.0 255.255.255.255 DHCP DiscoverĭHCPsrvr Broadcast DHCPsrvr 255.255.255.255 DHCP OfferĬlient Broadcast 0.0.0.0 255.255.255.255 DHCP RequestĭHCPsrvr Broadcast DHCPsrvr 255.255.255.255 DHCP ACK When a client is initialized for the first time after it is configured to receive DHCP information, it initiates a conversation with the server.īelow is a summary table of the conversation between client and server, which is followed by a packet-level description of the process: Source Dest Source Dest Packet The following Microsoft server operating systems provide DHCP server functionality: Microsoft TCP/IP-32 for Windows for Workgroups versions 3.11, 3.11a, and 3.11bĭifferent DHCP clients support different options that they can receive from the DHCP server. Microsoft LAN Manager Client version 2.2c for MS-DOS ![]() Microsoft Network Client version 3.0 for MS-DOS Windows NT Workstation versions 3.5, 3.51, and 4.0 Windows NT Server versions 3.5, 3.51, and 4.0 The following Microsoft products provide DHCP client functionality: The system administrator configures the DHCP server with the options that are parsed out to the client. Other information can be provided as well, such as Domain Name Service (DNS) server addresses and Windows Internet Name Service (WINS) server addresses. Normally the DHCP server provides the client with at least this basic information: Dynamic Host Configuration Protocol (DHCP) is a standard protocol defined by RFC 1541 (which is superseded by RFC 2131) that allows a server to dynamically distribute IP addressing and configuration information to clients.
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