DHCP.


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Outline. Diagram. IntroductionBasicsCase - We play DHCP ServerProblems TasksSolutionsApply what you\'ve learnedConclusion. as a rule. Nuts and bolts. Element Host Configuration ProtocolStandard protocolDefined by RFC 1541 (superseded by RFC 2131)Created by the Host Configuration Working Group of the Internet Engineering Task Force (IETF).
Transcripts
Slide 1

… and how it functions DHCP by steffen diehl

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Overview Introduction Basics Case - We play DHCP Server Problems Tasks Solutions Apply what you\'ve realized Conclusion Overview

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Basics D ynamic H ost C onfiguration P rotocol Standard convention Defined by RFC 1541 (superseded by RFC 2131) Created by the Host Configuration Working Group of the I nternet E ngineering T ask F orce (IETF) as a rule

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Basics Runs over UDP Utilizing ports: 67 – associations with server 68 – associations with customer Extension of BOOTP (convention utilized for straightforward connection) Uses client–server model techiques

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Case Got a system Want to include new customers DHCP-Server doesn\'t work How do customers get their: IP Address - or-system setup parameters (Subnet Mask, Default Gateway, DNS and WINS) Need substitution!! issue

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Case - Theory 1 st usage objective of a DHCP Server backing of element portion of Network Addresses picks and distributes an IP address gives system setup parameters to the customer server errands I

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Case - Theory Need 2 databases Address Pool is the database which holds IP addresses and other system design parameters Binding database continues mapping between an Ethernet address and Address Pool passages parts of a DHCP Server

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Case - Theory All communications are started by a customer Server just answers "acquire an IP address consequently" in NW choices arranging the host to the system is finished by a basic handshake customer conditions

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Case – by and by Client communicates DHCPDISCOVER One or more servers return DHCPOFFER with accessible Address and NW Information Clients picks one offer that it enjoys best communicates DHCPREQUEST to recognize picked Server/lease DHCPREQUEST additionally to restore lease ventures in turning out to be a piece of the system I

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Case - by and by Server sends DHCPACK Lease is settled Client begins utilizing IP DHCPNAK Client resumes from DHCPDISCOVER point If customer doesn\'t need IP - DHCPDECLINE is sent DHCPRELEASE gives IP again into pool ventures in turning out to be a piece of the system II

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Case - Theory Static/Manual designation Server allots IP picked by the Admin Server arrangement incorporates IP-Address -and-MAC-Address for each customer DHCP just used to pass on appointed location to customer sorts of relegating locations I

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Case - Theory Automatic assignment IP location is for all time connected with a MAC address till executive intercedes the boundless lease Dynamic portion Like Automatic portion Except: server tracks leases give IP addresses whose lease has lapsed to other DHCP customers sorts of allotting locations II end

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Case - Theory Client is dependable to recharge/discharge IP Lease timestamps: Total lease term T1 (0.5 * duration_of_lease) customer enters the RENEWING state contacts the server that initially issued system address T2 (0.875 * duration_of_lease) customer enters the REBINDING state endeavors to contact any server lease span

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Case - Theory Lease length Client holds IP when not associated Clients resign Servers/Databases ought to have consistent IP\'s Analyze the NW Often evolving customers? Servers/databases? Enough IP Addresses accessible? issues

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Case - Theory By utilizing the fitting Methods… execution objectives 2-4 of a DHCP Server… server ought to have the capacity to reuse the IP address when the lease time frame is lapsed A system overseer ought not design every customer/client connection of every customer ought not be required. backing of static designation and a boundless lease … can likewise be realized!!!! server errands II

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Case - practically speaking Servers: WEB-Server 192.168.1.1 Access Point 192.168.1.2 Lecturers by means of Ethernet: Range from .100 to .102 Students by means of WLAN: Range from .200 to .230 discover an answer!!! back

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Conclusion Insecurity of UDP Broadcast of messages Risk of wrong arrangement bringing about High activity Waste of IP Addresses significantly more work than anticipated Detailed and exact investigation before usage required antagonistic angles

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Conclusion functions admirably in the event that you need to deal with a ton of versatile clients: individuals with portable PCs working all through the workplace has traveling every which way with an awesome measure of recurrence immaculate when Network parameters have changed stand out point you need to work at sharing a restricted pool of IP locations Mixture of distribution sorts can be utilized positive viewpoints

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Conclusion Thank you for your consideration … any inquiries?? the end

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Refrences RFC 2131, Dynamic Host Configuration Protocol RFC 2322, Management of IP numbers by peg-dhcp www.ietf.org , I nternet E ngineering T ask F orce www.microsoft.com , Microsoft Knowledge Base Article - 169289

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