Laboratory (03) DHCP service

Transcription

1 Laboratory (03) DHCP service By: Dr. Ahmed ElShafee ١ Dr. Ahmed ElShafee, ACU : Fall 2015, Networks II Laboratory Agenda Introduction to DHCP Windows Server 2008 DHCP Install Environment WINS service Configuring DHCP Service ٢

2 Before beginning Install VMware tools on Windows Server 2008 Create new Virtual machine, install windows 7 ٣ Introduction to DHCP DHCP stands for Dynamic Host Configuration Protocol, and its main purpose in life is to give your computer an IP address so it can send and receive data on the network. DHCP works through 4 basic steps: 1. Discovery When a computer is setup to use DHCP and is attached to the network it sends out a broadcast called DHCPDISCOVER looking for a DHCP server. Alternatively, it will request the last IP used by its DHCP client. 2. Offer The DHCP server will respond with a lease offer that is called DHCPOFFER and includes the lease duration, IP address, subnet mask, clients MAC address, and IP address of Dr. the Ahmed DHCP ElShafee, server. ACU : Fall 2015, Networks II Laboratory ٤

3 3. Request Once the client computer receives the offer and accepts it, it then sends out a broadcast called DHCPRequest that contains the IP address of the DHCP server that issued the accepted client IP. This tells other DHCP servers that their offer if any was refused, and keeps the IPs free for others. 4. Acknowledgement The DHCP server then sends out a DHCPACK packet to the client that includes lease duration and any other configuration information needed by the client. At this point the IP configuration process is done and the client configures its network interface. ٥ It is important to note that the majority of these messages are broadcasts which means that your routers must be configured to pass these on if the DHCP server is not on the same subnet as the client. ٦

4 Windows Server 2008 DHCP Install Environment we have the following already setup: Windows Server 2008 Installed Active Directory Domain Services Installed DNS Server Installed Static IP on DHCP Server ٧ ٨

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9 WINS service Although NetBIOS and NetBIOS names can be used with network protocols other than TCP/IP, WINS was designed specifically to support NetBIOS over TCP/IP (NetBT). WINS is required for any environment in which users access resources that have NetBIOS names. If you do not use WINS in such a network, you cannot connect to a remote network resource by using its NetBIOS name unless you use Lmhosts files, and you might be unable to establish file and print sharing connections. The following figure illustrates the role of WINS for computers that use NetBIOS names. Typically, DHCP is used to assign IP addresses automatically. ١٧ ClientA, which uses NetBIOS and is a WINS client, sends a name registration request to its configured primary WINS server (WINSA) when it starts up and joins the network. WINSA adds ClientA's NetBIOS name and IP address to the WINS database. When ClientB needs to connect to ClientA by its name, it requests the IP address from the WINS server. The WINS server locates the corresponding entry in its ١٨ database and replies with ClientA's IP address.

10 WINS and DNS WINS and DNS are both name resolution services for TCP/IP networks. While WINS resolves names in the NetBIOS namespace, DNS resolves names in the DNS domain namespace. WINS primarily supports clients that run older versions of Windows and applications that use NetBIOS. Windows 2000, Windows XP, and Windows Server 2003 use DNS names in addition to NetBIOS names. Environments that include some computers that use NetBIOS names and other computers that use domain names must include both WINS servers and DNS servers. ١٩ ٢٠

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12 ٢٣ The next screen will ask for the IPv6 DNS Server Settings, much like the IPv4 screen I am going to use the default for Parent Domain and then type ::1 for the DNS IPv6 address which is the equivalent of localhost. Click Next when done. ٢٤

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17 Configuring DHCP Service ٣٣

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30 Thanks,.. See you next week (ISA), ٥٩ Dr. Ahmed ElShafee, ACU : Fall 2015, Networks II Laboratory