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Describe the stages of a DHCP leasing process Recognize and read various DHCP messages in a Network Monitor trace
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Estimated lesson time: 60 minutes
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Understanding How Clients Obtain Configuration
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DHCP clients use two different processes to communicate with DHCP servers and obtain a configuration. The initialization process occurs when a client computer first starts and attempts to join the network. The renewal process occurs after a client has a lease but needs to renew that lease with the server.
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Initial Lease Process
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The first time a DHCP-enabled client starts, it automatically engages the following ini tialization process to obtain a lease from a DHCP server: The DHCP client broadcasts a DHCP Discover message to the local subnet. A DHCP server can respond with a DHCP Offer message that contains an offered IP address for lease to the client. If no DHCP servers respond to the client discovery request, the client can proceed in either of two ways:
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If the client is running Microsoft Windows 2000, the client configures itself with an Automatic Private IP Addressing (APIPA) address. If the client is running Microsoft Windows XP or a member of the Windows Server 2003 family, the client configures itself with an alternate address (if provided). If no static alternate address has been provided, the client config ures itself with an APIPA address.
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If the client is running a version of Windows earlier than Windows 2000, or if no static alternate address has been provided and IP autoconfiguration has been dis abled, the client fails to initialize. If left running, it continues to resend DHCP Dis cover messages (4 times every 5 minutes) until it receives a DHCP Offer message from a server.
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8
Monitoring and Troubleshooting DHCP
4. As soon as a DHCP Offer message is received, the client selects the offered address by replying to the server with a DHCP Request message. Typically, the offering server sends a DHCP Acknowledgment (DHCP ACK) mes sage approving the lease. (DHCP options information is included in the acknowledgment.) 5. Once the client receives acknowledgment, it configures its Transmission Control Protocol/Internet Protocol (TCP/IP) properties using the information in the reply and joins the network. Figure 8-1 illustrates the lease process just described between the DHCP server and client.
DHCP client IP lease request IP lease offers IP lease selection IP lease acknowledgment
DHCP servers
Figure 8-1 DHCP lease process
Lease Renewal Process
When a DHCP client shuts down and restarts, it typically obtains a lease for the same IP address it had prior to the shutdown. Leases are also renewed after 50 percent (four days by default) of the client lease time elapses and when the Ipconfig /renew com mand is executed on the client. When the Ipconfig /renew command is executed, the client tries to renew its lease with the DHCP server as follows: 1. The client sends a DHCP Request message directly to the server that leased it, to renew and extend its current address lease. 2. If the server is reachable, it typically sends a DHCP ACK to the client, which renews the current lease. Also, as in the initial lease process, other DHCP options information is included in this reply. If any options information has changed since the client first obtained its lease, the client updates its configuration accordingly.
Lesson 1
Analyzing DHCP Traffic
3. If the client is unable to communicate with its original DHCP server, the client waits until it reaches a rebinding state. By default, this state occurs seven days after the last lease renewal. When the client reaches this state, it attempts to renew its current lease with any available DHCP server. 4. If a server responds with a DHCP Offer message to update the current client lease, the client can renew its lease based on the offering server and continue operation. 5. If the lease expires and no server has been contacted, the client must immediately discontinue using its leased IP address. 6. The client then follows the same process used during its initial startup operation to obtain a new IP address lease.
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