DHCP Training

Scopes Currently Not Established Schools Scopes Currently Not Established WAN Wireless 10.x.176.1 192.254 Server Backup ETS 10.251.128.159 Server Primary School 10.x.192.9 Wire 10.x.192.1 199.254 Look Up LAN running 24 hours Searching every hour for new IP addresses All IPs used in the Static Ranges 10.x.192.1-193.255 Posts to a server and uploaded into a Filemaker Pro database that is web enabled

KCW Server Backup ETS 10.251.128.159 Server Primary KCW 10.202.0.9 WAN Wireless Floor 14 Server Primary KCW 10.202.0.9 Floor 1 Look Up Lan running 24 hours Searching every hour for new IP addresses All IPs used on all floors Of KCW in the Static Ranges 10.x.0.1-255 Posts to a server and uploaded into a filemakerpro database that is web enabled

Primary Backup

DHCP Basics Overview What is DHCP? Why use it? How does it work? DHCP allows a host to learn its configuration parameters from a server. It automates IP configuration, making it much easier to connect to a network. It allows re-use of IP addresses. Why use DHCP? Visitor convenience Speeds setup of new machines Simplifies conference room connections Allows roaming laptops Centralizes IP management

DHCP Basics How does DHCP work? 1. Server discovery Client DHCPDISCOVER packet asking “Who can give me DHCP information?” Hello 2. Servers make an offer All servers on the subnet unicast a DHCPOFFER packet saying “I can supply you with DHCP information, if you like.” What Do You need 3. Client requests The client selects one of the responses, and broadcasts a DHCPREQUEST packet saying “I choose server XYZ. Server XYZ, here’s my MAC address, what’s my IP address?” Give Me An Address The unchosen servers treat this as a rejection. The request can specify a preferred IP address, if the client has a preference. The request can ask for additional information. 4. Server responds Here It is and for How long The server responds with a DHCPACK packet saying “Here is your IP address. It’s good for 24 hours.” The response can contain additional information, if the client asked for it. The server records that the IP address is in use. 5. Client releases You Can Have it Back The client finishes it’s work, and send a DHCPRELEASE packet saying “I’m done with the IP address.” The server records that the IP address is not in use.

DHCP Basics Clients refresh leases When half the lease time has expired, a client broadcasts another DHCPREQUEST packet saying “I choose server XYZ. Server XYZ, I want IP address N. Can I have it?”. The server responds yes or no. Servers can refuse If a server can’t supply an unused IP address, or if the server can’t supply an IP address that matches the client’s MAC address, the server sends a DHCPNAK packet saying “you can’t have an IP address”. The client is then free to make another request. Clients preserve addresses A client can remember its last-used IP address in non-volatile memory. When it boots, it can request the address from the server. This improves the chances that a client will retain the same IP address over long periods of time.

DHCP Basics What DHCP can provide IP address and lease time Network Parameters IP Address Tracking Management Scope size Lease Times Exclusion Area Reservations What DHCP can provide IP address and lease time subnet mask default route DNS, NIS, LPR, NTP, logging server(s) WINS NBNS node type More Static vs. dynamic addresses DHCP servers manage two kinds of IP addresses: o Static IP addresses, which the server gives to clients based on the client’s MAC address o Dynamic IP addresses, which the server gives to clients as requested. These come from a “pool” of addresses in a subnet, set aside for this purpose

DHCP Basics Client Address Leases

DHCP Basics Typical Client Parameters Provided Typical DHCP Properties

DHCP Basics Reservations Exclusion Areas

Complete Site DHCP Service SBBC Dynamic Host Control Protocol (DHCP) Network Standard Elementary/Middle/High Primary Wired VLAN: 10.x.192.1 10.x.128.1 10.x.193.255 10.x.129.255 10.x.194.1 10.x.130.1 10.x.198.255 10.x.134.255 10.x.199.1 10.x.135.1 10.x.199.254 10.x.135.254 Gateway 10.x.192.1-2 10.x.128.1-2 Server range 10.x.192.1-20 10.x.128.1-20 Printers:10.x.192.21-193.255 10.x.128.21-129.255 (510 Addresses) DHCP Wireless Clients (1020 Addresses) Reserved Network Equipment (255 Addresses) Elementary/Middle/High Primary Wireless (176) VLAN: 10.x.176.1 10.x.112.1 10.x.176.255 10.x.112.255 10.x.177.1 10.x.113.1 10.x.188.255 10.x.125.255 10.x.189.1 10.x.126.1 10.x.191.254 10.x.127.254 Static Printers and Servers (255Addresses) DHCP Wired Clients (3060 Addresses) Backup DHCP Server (764 Addresses)

KCW DHCP Structure Wireless VOIP DHCP Server IP Addresses 4 Floor 1 5 Floor 2 6 Floor 3 7 Floor 4 2 Floor 5 Static Printers and Servers (255Addresses) 10.201.0.3 10.201.0.255 10.201.1.0 10.201.5.255 10.201.6.0 10.201.6.255 10.201.7.0 10.201.7.254 10.202.0.3 10.202.0.255 10.202.1.0 10.202.5.255 10.202.6.0 10.202.6.255 10.202.7.0 10.202.7.254 10.203.0.3 10.203.0.255 10.203.1.0 10.203.5.255 10.203.6.0 10.203.6.255 10.203.7.0 10.2037.254 10.204.0.3 10.204.0.255 10.204.1.0 10.204.5.255 10.204.6.0 10.204.6.255 10.204.7.0 10.204.7.254 10.205.0.3 10.205.0.255 10.205.1.0 10.201.5.255 10.205.6.0 10.205.6.255 10.205.7.0 10.205.7.254 DHCP Server IP Addresses Primary room 202 CER: 10.202.0.9 Backup a ETS: 10.252.128.159 DHCP Wired Clients (1275 Addresses) Backup DHCP Server (255 Addresses) Network Equipment Range (254 Addresses) 8 Floor 6 9 Floor 7 3 Floor 8 10 Floor 9 14 Floor 10 Static Printers and Servers (255Addresses) 10.206.0.3 10.206.0.255 10.206.1.0 10.206.5.255 10.206.6.0 10.206.6.255 10.206.7.0 10.206.7.254 10.207.0.3 10.207.0.255 10.207.1.0 10.207.5.255 10.207.6.0 10.207.6.255 10.207.7.0 10.207.7.254 10.208.0.3 10.208.0.255 10.208.1.0 10.208.5.255 10.208.6.0 10.208.6.255 10.208.7.0 10.208.7.254 10.209.0.3 10.209.0.255 10.209.1.0 10.209.5.255 10.209.6.0 10.209.6.255 10.209.7.0 10.209.7.254 10.210.0.3 10.210.0.255 10.210.1.0 10.210.5.255 10.210.6.0 10.210.6.255 10.210.7.0 10.210.7.254 DHCP Wired Clients (1275 Addresses) Backup DHCP Server (255 Addresses) Network Equipment Range (254 Addresses) 11 Floor 11 12 Floor 12 13 Floor 13 1 Floor 14 Wireless VOIP Static Printers and Servers (255Addresses) 10.211.0.3 10.211.0.255 10.21.1.0 10.211.5.255 10.211.6.0 10.211.6.255 10.211.7.0 10.211.7.254 10.212.0.3 10.212.0.255 10.212.1.0 10.212.5.255 10.212.6.0 10.212.6.255 10.212.7.0 10.212.7.254 10.213.0.3 10.213.0.255 10.213.1.0 10.213.5.255 10.213.6.0 10.213.6.255 10.213.7.0 10.213.7.254 10.214.0.3 10.214.0.255 10.214.1.0 10.214.5.255 10.214.6.0 10.214.6.255 10.214.7.0 10.214.7.254 10.215.0.3 10.215.0.255 10.215.1.0 10.215.5.255 10.215.6.0 10.215.6.255 10.215.7.0 10.215.7.254 10.216.0.3 10.216.0.255 10.216.1.0 10.216.5.255 10.216.6.0 10.216.6.255 10.216.7.0 10.216.7.254 DHCP Wired Clients (1275 Addresses) Backup DHCP Server (255 Addresses) Network Equipment Range (254 Addresses)

Step 1 10.25. Cypress Bay Step 2 Enter Name Or Enter TCP Scope Range Step 3

These are IP addresses that have been pinged at one time These are IP addresses that have been pinged at one time. An Available IP address is one that does not show up in the Database example: 10.25.192.24

DHCP Basics Reservations On Server Open DHCP

DHCP Basics Reservations Click on the wired scope and select reservations

DHCP Basics Reservations Click Action then select New Reservation

DHCP Basics Reservations Enter the printer information as shown. Use the Mac address from the printer and type in the ip address of the printer

DHCP Basics Reservations The reservation will show as follows

DHCP Basics Reservations The reservation will show as follows