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(@ p 8:$0 S'5Managing a DHCP Environment</,//6 X0H040dd(111  (P@  8:$0m su!5Thursday, 27 May 1999 4:00 - 5:00</,/!/3 0040dd 40dd(11!1 6 (@  8:v$0- 5DECUS Ireland - 99</,//,33 X0H040dd(111  (@  8:$0 }x$5Jeff Schreiber schreiber@process.com</,/$/ 0040dd40dd(11$1 ? (@ p 8:$0 S'51997-1999 Process Software</,// X0H040dd(111 @ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8 8 D   (T t  8:#l$#0=: 5Contents</,//$Q X0H040dd(111    ( 0 8,:$0-v 5DHCP Overview Types of Address Allocation DHCP Operation Configuration Guidelines Security Issues Troubleshooting Tips IP Address Management Products References</,// P0@040UnKd40UnKd40UnKd40UnKd40UnKd40UnKd40UnKd 40UnKd(111@ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8  I   (T t  8:#q$#0=:  5DHCP Overview</,/ /$Q X0H0 40dd(11 1 O   ( 0 8:w$0-v '5Dynamic Host Configuration Protocol A tool for centralized management of TCP/IP addresses Address assignment for TCP/IP hosts is often an administrative burden A recent Forrester survey found 72% of respondents were having TCP/IP addressing problems 80% of respondents used manual configuration//$/ 6/ f/ g/ 00$40UnKd640ddF40dd 40dd:40dd-40dd(11'1u@ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8 = ~   (T t  8:#$#0=: N5DHCP Overview (Contd)h/X//$Q /Q X0H040dd(111    ( 0 8:$0-v oK5Dynamic Host Configuration Protocol Provides configuration parameters to hosts IP address, address mask, router address, host name, and others Extension of the BOOTP protocol Allows use of existing BOOTP relay agents and configuration information Expands functionality of BOOTP which just had support for manual address allocation//$/ +/ A/ / / 00$40UnKd+40ddA40dd 40ddH40ddS40dd(11K1 @ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8 Y S   (T t  8:#{$#0=: #5DHCP Address Allocation</,//$Q X0H040dd(111    ( 0 8>:$0-v 25Three mechanisms for IP address allocation Automatic allocation - IP address is permanently assigned to a client Dynamic allocation - IP address is temporarily assigned (leased) to a client Manual allocation - IP address is assigned by a network administrator to a client All three can operate at same time//+/ / "/ x0h0+40UnKdF40ddM40ddR40dd"40UnKd(1121 @ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8 Z X   (T t  8:#$#0=: (5Automatic Address Allocation</,//$Q X0H040dd(111    ( 0 8:: $0-v 5Once an address is assigned to a client, that client has that same address forever (infinite lease) Assignment is based on clients identifier (name or hardware address) Address can only be reclaimed by modifying configuration file/database and by removing address from client</,// 00f40UnKdF40UnKdj40UnKd(111 @ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8  V   (T t  8:#~$#0=: &5Dynamic Address Allocation</,//$Q X0H040dd(111 *   ( 0 8:R$0-v 5Client assigned address when it requests one for a limited time (lease time) Client must renew address request to extend lease (if granted) Addresses can be reclaimed by disallowing leases (new and extensions) after lease time expires Most useful for laptops and temporary users</,// 00 0M40UnKd?40UnKd_40UnKd+40UnKd(111Q @ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8  U   (T t  8:#}$#0=: %5Manual Address Allocation</,//$Q X0H040dd(111 |   ( 0 8:$0-v L5Network administrator enters IP address and clients network address in DHCP/BOOTP configuration database Most useful for blackbox devices such as routers, gateways, printers, and terminal servers that need to have fixed and well-known IP addresses</,// 00j40UnKd40UnKd(111 @ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8  J   (T t  8:#r$#0=: 5DHCP Operation</,//$Q X0H040dd(111 `   ( 0 8:$0-v 05DHCP uses UDP datagrams Client and server use broadcasts to communicate until client has assigned address Basic address assignment takes 5 steps ...</,// 0040UnKdR40UnKd*40UnKd(111?@ABCDEFGHIJKLMNOPQRSTUVWY[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ Q/ x0h0V40UnKd*40dd'40dd%40ddQ40UnKd(111< @ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8     (T t  8:#$#0=: P5Security Issues (Contd)h/X//$Q /Q X0H040dd(111 <   ( 0 8:d$0-v  5Dynamic IP address ranges must have same IP address based filtering IP address/host name based authentication may be a problem (NFS, R commands) Consider all dynamic address ranges to be either valid or invalid as a group Cant rely on unique host nameh/X// k/ 00 0D40UnKdM40UnKdM40dd40dd(111 $@ p,0%$pK ,0H./04x$xa(  (pK 8 (   ([g 8D$   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8 e    (T t  8:#$#0=: P5Security Issues (Contd)h/X//$Q /Q X0H040dd(111    ( 0 8:$0-v 5If DHCP servers dynamically update DNS, make sure Master DNS servers have proper security to restrict update access to your DHCP servers.</,// X0H040UnKd(111^@ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8  P   (T t  8:#x$#0=:  5Troubleshooting Tips</,//$Q X0H040dd(111    ( 0 8:$0-v ^5Error reporting for many clients is very poor or non-existent May silently discard datagrams they dont like Verify hardware address is correct Remember to change it if network cards replaced or upgraded Provide all required information Network mask is typically needed!//>/ // #/ </ !/ !/ 00>40UnKd/40dd#40UnKd<40dd!40UnKd!40dd(111$%@ p,0%%pK ,0H./04x$xa(  (pK 8 (   ([g 8D%   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8  Z   (p8  8:#$#0U *5IP Address Management Products</,//$Q X0H040dd(111 r   (0  8:$0jv B5Process Softwares IP Address Works Cisco/American Internets Network Registrar Lucent/Quadritek Systems QIP Checkpoint/MetaInfos Meta IP Microsofts DHCP / DNS Manager Network TeleSystems Shadow Server Bay Networks NetID Enterprise Cisco Systems Cisco DNS/DHCP Managerh/X/$/ / P0@0$40UnKd,40UnKd40UnKd40UnKd40UnKd#40UnKd40UnKd%40UnKd(111@ p,0%pK ,0H./04x$xa(  (pK 8 (   ([g 8D   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8 o  F   (T t  8:#n$#0=:  5References</,/ /$Q X0H0 40dd(11 1    ( 0 8a:1$0-v ]5RFC 2131, Dynamic Host Configuration Protocol RFC 2132, DHCP Options and BOOTP Vendor Extensions RFC 1534, Interoperation Between DHCP and BOOTP RFC 951, Bootstrap Protocol (BOOTP) RFC 2136, Dynamic Updates in the Domain Name System draft-ietf-dhc-failover-03.txt, DHCP Failover Protocol DHCP FAQ -http://web.syr.edu/~jmwobus/comfaqs/dhcp.faq.html// / #/ / )/ / / %/ / / / / */ / / / / 1/ 00.40UnKd440UnKd040UnKd$40UnKd440UnKd740UnKd<40UnKd(11]1 #@ p,0%#pK ,0H./04x$xa(  (pK 8 (   ([g 8D#   (p0  8t:D$Ĥ0 } 42dd3 w5//0011  8.04x$xw&UGGG333  (@ p 8  D   (@@  8:#l$#0z]V 5Handouts</,//$Q X0H040dd(111 d (09 8:$0jL5Slides available via anonymous FTP: ftp://ftp.process.com/decus/ireland_99/dhcp.ppt ftp://ftp.process.com/decus/ireland_99/dhcp.psh/X/$/ `/ 00$40dU140dU/40dU(111 '@ p,0%'pK ,0H./04x$xa(  (pK 8 (   (p0  8t<D$Ĥ0 } 42dd3 w5//0011   (\f 8D'  8.04x$xw&UGGG333  (@ p 8 w  (p  8  (p 8 . 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(ww  8 bwwwwwwxxxyy{{}}{yyxxxwwwwww t (5y5y:  8 :]y5y6y8y8{8}:}:::886655OOMMKKKKqqqqooo}{{yysyuyv{v}x}xxYYY}Y{[{[y]y @ p,0  h .Reference #%0DECUSworld '97 - October 24 - 27 19974x$xw&UGGG333  (@ p 8w&U7'  \  (  8:#$D#0 s, 5Click to edit Master title style</,/ /$Q X0H0 40dd(11 1 _   (0@ 8:$D0Mc/#5Click to edit Master subtitle style</,/#/ X0H0#40TnKd(11#1 =  (p  8:e$@0  5*</,// ff X0H040dd(111 =  (R < 8:e$@0 V  5*</,// ff X0H040dd(111 X 4  (@ 8od  (@ 8ى`'pK  0H./04x$xa(  (pK 8 Y =   ( 8 e$D0 5*</,//  X0H040dd(111 =  ( p 8 e$D0,d 5*</,//  X0H040dd(111 =  (+ L  8 #e$D#0+ L  5*</,//  X0H040dd(111 =  ( + pL  8 #e$D#0,+ dL  5*</,//  X0H040dd(111 _  (p0  8:$D0 } /S5Click to edit Master notes styles Second Level Third Level Fourth Level Fifth Level//"/  /  /  /  /  x0h0"40dd 40dd 40dd 40dd 40dd(11S1   ([g 8D @ (m 8:$0 3(5Process Software Corporation</,// X0H040dd(111 % (S   8:e$0p I  5*</,// X0H040dd(111 % (PS F  8:e$0p   5*</,// X0H040dd(111KpK H./04x$xa(  (pK 8  =   ( 8 e$D0 5*</,//  X0H040dd(111 =  ( p 8 e$D0,d 5*</,//  X0H040dd(111 =  (+ L  8 #e$D#0+ L  5*</,//   X0H040dd(111 =  ( + pL  8 #e$D#0,+ dL  5*</,//   X0H040dd(111 n (o 8:$0 5VJ5Managing a DHCP Environment 1997-1999 by Process Software Corporation</,/J/ X0H0J40dd(11J1 % (PT F  8:e$0q   5*</,// X0H040dd(111 04?d?dK v$de, &Current UserHeader9SummaryInformation(RDocumentSummaryInformation8hTimes New RomanNews Gothic MTMonotype SortsArialCourier dworld97.pptMicrosoft Clip GalleryNo Slide Title ContentsDHCP OverviewDHCP Overview (Contd)DHCP Address AllocationAutomatic Address AllocationDynamic Address AllocationManual Address AllocationDHCP OperationDHCP TimelineDHCP MessagesDHCP Operation - Step 1DHCP Operation - Step 2!DHCP Operation - Step 2 (Contd)!DHCP Operation - Step 2 (Contd)Oh+'0hR$ <H l x  Managing a DHCP EnvironmentDHCPingCIRRUSgIRRFor European DECUSiC:\TEMP\dworld97.pptonmJeff Schreiber753fMicrosoft PowerPoint 4.0nt@xt>@p L@P!ݔy@R`*GP%  R('&; &&#TNPP0D z & TNPP &&TNPP   ;  'A x;(xKʦ 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&DHCP Operation - Step 3DHCP Operation - Step 4DHCP Operation - Step 5DHCP Operation - Step 6DHCP Operation - Step 7DHCP Operation - Step 8#DHCP Failover (AKA Redundant DHCP)Dynamic Updates to DNSConfiguration Guidelines"Configuration Guidelines (Contd)Security IssuesSecurity Issues (Contd)Security Issues (Contd)Troubleshooting TipsIP Address Management Products References HandoutsNo Slide Title  Fonts UsedDesign TemplateEmbedded OLE Servers Slide Titles!