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Monitoring and Troubleshooting DHCP
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the DHCP: Requested Address field. The DHCP: Server Identifier field in the DHCP: Option Field section shows the IP address of the DHCP server offering the lease.
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IP: ID IP: IP: IP: = 0x100; Proto = UDP; Len: 328 Version = 4 (0x4) Header Length = 20 (0x14) Service Type = 0 (0x0) IP: Precedence = Routine
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IP: ...0.... = Normal Delay
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IP: ....0... = Normal Throughput
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IP: .....0.. = Normal Reliability
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Total Length = 328 (0x148) Identification = 256 (0x100) Flags Summary = 0 (0x0) IP: .......0 = Last fragment in datagram IP: ......0. = May fragment datagram if necessary Fragment Offset = 0 (0x0) bytes Time to Live = 128 (0x80) Protocol = UDP - User Datagram Checksum = 0x38A6 Source Address = 0.0.0.0 Destination Address = 255.255.255.255 Data: Number of data bytes remaining = 308 (0x0134)
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DHCP: Request (xid=21274A1D) DHCP: Op Code (op) = 1 (0x1) DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet DHCP: Hardware Address Length (hlen) = 6 (0x6) DHCP: Hops (hops) = 0 (0x0) DHCP: Transaction ID (xid) = 556223005 (0x21274A1D) DHCP: Seconds (secs) = 0 (0x0) DHCP: Flags (flags) = 0 (0x0) DHCP: 0............... = No Broadcast DHCP: Client IP Address (ciaddr) = 0.0.0.0 DHCP: Your IP Address (yiaddr) = 0.0.0.0 DHCP: Server IP Address (siaddr) = 0.0.0.0 DHCP: Relay IP Address (giaddr) = 0.0.0.0 DHCP: Client Ethernet Address (chaddr) = 08002B2ED85E DHCP: Server Host Name (sname) = <Blank> DHCP: Boot File Name (file) = <Blank> DHCP: Magic Cookie = [OK] DHCP: Option Field (options) DHCP: DHCP Message Type = DHCP Request
DHCP: Client Identifier = (Type: 1) 08 00 2b 2e d8 5e
DHCP: Requested Address = 10.54.50.5
DHCP: Server Identifier = 10.54.48.151
DHCP: Host Name = CLIENT1
DHCP: Dynamic DNS updates = (Length: 26) 00 00 00 63 6f 6d ...
DHCP: Client Class information = (Length: 8) 4d 53 46 54 20 35 2e 30
DHCP: Parameter Request List = (Length: 7) 01 0f 03 2c 2e 2f 06
DHCP: End of this option field
If the client has previously had a DHCP-assigned IP address, and the client is restarted, the client specifically requests this previously leased IP address in the DHCP Request
Lesson 1
Analyzing DHCP Traffic
8-11
packet. Microsoft clients populate DHCP Option Field DHCP: Requested Address with the previously assigned address. Strictly RFC-compliant clients populate the DHCP: Cli ent IP Address (Ciaddr) field with the address requested. The DHCP server accepts either. If the server determines that the client can still use the address, it either remains silent or sends an ACK of the DHCP Request message. If the server determines that the client cannot have the address, it sends a NACK.
Exam Tip
The DHCP Request message is the message that requests dynamic updates from the DHCP server. Typically, the Request message supplies the fully qualified domain name (FQDN) of the client so that the DHCP server can then update the client s PTR resource record accordingly. One way to remember this point is to think of the setting in the DHCP server prop erties dialog box: Update According To Client Request. Well, here is the Request.
DHCP ACK The DHCP server normally responds to the DHCP Request message with a DHCP ACK, thus completing the initialization cycle. This message contains a commit ted IP address for the client to use for a stated period of time, along with other optional client parameters. The source address in the following capture is the DHCP server IP address, and the destination address is still 255.255.255.255. The DHCP section identifies the packet as an ACK. The DHCP: Your IP Address (Yiaddr) field contains the client s address, and the DHCP: Client Ethernet Address (Chaddr) field contains the physical address of the network card in the requesting client.
IP: ID IP: IP: IP: = 0x3D30; Proto = UDP; Len: 328 Version = 4 (0x4) Header Length = 20 (0x14) Service Type = 0 (0x0) IP: Precedence = Routine
IP: ...0.... = Normal Delay
IP: ....0... = Normal Throughput
IP: .....0.. = Normal Reliability
Total Length = 328 (0x148)
Identification = 15664 (0x3D30)
Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram IP: ......0. = May fragment datagram if necessary Fragment Offset = 0 (0x0) bytes Time to Live = 128 (0x80) Protocol = UDP - User Datagram Checksum = 0x2EA8 Source Address = 10.54.48.151 Destination Address = 255.255.255.255 Data: Number of data bytes remaining = 308 (0x0134) (xid=21274A1D) (op) = 2 (0x2)
IP: IP: IP:
IP: IP: IP: IP: IP: IP: IP:
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