Droms R. The DHCP handbook
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TABLE D.2 DHCP Options, Listed in Numeric Order by Option Code
Option Name Code ISC Option Name Microsoft Option Name
Pad 0 pad
Subnet mask 1 subnet-mask
Time offset 2 time-offset Time Offset
Routers 3 routers Router
Time server 4 time-servers Time Server
Name server 5 ien116-name-servers Name Servers
Domain Name Servers 6 domain-name-servers DNS Servers
Log server 7 log-servers Log Servers
Cookie server 8 cookie-servers Cookie Servers
LPR server 9 lpr-servers LPR Servers
Impress server 10 impress-servers Impress Servers
Resource location servers 11 resource-location-servers Resource Location
Servers
Host name 12 host-name Host Name
Boot file size 13 boot-size Boot File Size
Merit dump file 14 merit-dump Merit Dump File
Domain name 15 domain-name Domain Name
Swap server 16 swap-server Swap Server
Root path 17 root-path Root Path
Extensions Path 18 extensions-path Extensions Path
IP forwarding 19 ip-forwarding IP Layer Forwarding
Non-local source routing 20 non-local-source-routing Non-local Source
Routing
Policy filter 21 policy-filter Policy Filter Masks
Maximum datagram 22 max-dgram-reassembly Max DG Reassembly Size
reassembly
Default IP TTL 23 default-ip-ttl Default Time-to-Live
Path MTU aging 24 path-mtu-aging-seconds Path MTU Aging Timeout
Path MTU plateau table 25 path-mtu-plateau-table Path MTU Plateau Table
Interface MTU 26 interface-mtu MTU Option
All subnets are local 27 all-subnets-local All Subnets Are Local
Broadcast address 28 broadcast-address Broadcast Address
Perform mask discovery 29 perform-mask-discovery Perform Mask Discovery
Mask supplier 30 mask-supplier Mask Supplier Option
Perform router discovery 31 router-discovery Perform Router
Discovery
Router solicitation address 32 router-solicitation-address Router Solicitation
Address
Static route 33 static-routes Static Route Option
Trailer 34 trailer-encapsulation Trailer Encapsulation
ARP cache timeout 35 arp-cache-timeout ARP Cache Timeout
APPENDIX D DHCP Options Summary516
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Ethernet encapsulation 36 ieee802-3-encapsulation Ethernet Encapsulation
TCP default TTL 37 default-tcp-ttl Default TTL Option
TCP keepalive interval 38 tcp-keepalive-interval Keepalive Interval
TCP keepalive garbage 39 tcp-keepalive-garbage Keepalive Garbage
NIS domain Name 40 nis-domain NIS Domain Name
NIS servers 41 nis-servers NIS Servers
NTP servers 42 ntp-servers NTP Servers
Vendor specific information 43 vendor-encapsulated-options Vendor Specific Info
NetBIOS over TCP/IP 44 netbios-name-servers WINS/NBNS Servers
name server
NetBIOS over TCP/IP 45 netbios-dd-server NetBIOS over TCP/IP
datagram distribution NBDD
NetBIOS over TCP/IP 46 netbios-node-type WINS/NBT Node type
node type
NetBIOS over TCP/IP scope 47 netbios-scope NetBIOS Scope ID
X Window System 48 font-servers X Window System Font
font server
X Window System 49 x-display-managers X Window System Display
Display Managers
Requested IP address 50 dhcp-requested-address
Length of DHCP lease 51 dhcp-lease-time
Option overload 52 dhcp-option-overload
DHCP Message Type 53 dhcp-message-type
Server identifier 54 dhcp-server-identifier
Parameter request list 55 dhcp-parameter-request-list
Message 56 dhcp-message
Maximum DHCP 57 dhcp-max-message-size
message size
T1 58 dhcp-renewal-time
T2 59 dhcp-rebinding-time
Vendor class identifier 60 vendor-class-identifier
Client identifier 61 dhcp-client-identifier Client’s Unique
Identifier
NetWare/IP domain 62 nwip-domain
NetWare/IP information 63 nwip.nsq-broadcast
nwip.preferred-dss
nwip.nearest-nwip-server
nwip.autoretries
nwip.autoretry-secs
nwip.nwip-1-1
nwip.primary-dss
APPENDIX D DHCP Options Summary 517
TABLE D.2 Continued
Option Name Code ISC Option Name Microsoft Option Name
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NIS+ domain Name 64 nisplus-domain NIS+ Domain Name
NIS+ servers 65 nisplus-servers NIS+ Servers
TFTP server name 66 tftp-server-name Boot Server Host Name
Boot file name 67 bootfile-name Boot File Name
Mobile IP home agents 68 mobile-ip-home-agents Mobile IP Home Agents
SMTP server 69 smtp-server Simple Mail Transport
Protocol (SMTP) Servers
POP3 server 70 pop-server Post Office Protocol
(POP3) Servers
NNTP server 71 nntp-server Network News Transport
Protocol (NNTP) Servers
WWW server 72 www-server World Wide Web (WWW)
Servers
Finger server 73 finger-server Finger Servers
IRC server 74 irc-server Internet Relay Chat
(IRC) Servers
StreetTalk server 75 streettalk-server StreetTalk Servers
StreetTalk directory 76 streettalk-directory- StreetTalk Directory
assistance server assistance-server Assistance (STDA)
servers
User Class 77 User Class
SLP Directory Agent 78 slp-directory-agent
SLP Service Scope 79 slp-service-scope
Relay Agent Information 82 relay-agent-information
Option
NDS server 85 nds-servers
NDS tree name 86 nds-tree-name
NDS context 87 nds-context
DHCP Authentication 90 authentication
option
UAP servers 98 uap-servers
Autoconfiguration 116 autoconfiguration
Name Service Search 117 name-service-search-order
Order
Subnet Selection Option 118 subnet-selection
End 255 option-end
APPENDIX D DHCP Options Summary518
TABLE D.2 Continued
Option Name Code ISC Option Name Microsoft Option Name
034 3273 App D 10/3/02 5:03 PM Page 518
E
Bibliography and Other
Resources
Web Resources for DHCP
The following resource is a Web site that accompanies this
text:
www.dhcp-handbook.com
DHCP users and implementers can also find helpful infor-
mation at the following site:
www.dhcp.org
On the DHCP site you’ll find an archive of minutes and
other documents from the IETF Dynamic Host
Configuration Working Group (DHCWG), as well as links
to DHCP RFCs, Internet Drafts, and other DHCP resources.
The DHCWG has a mailing list for discussion of DHCP and
IETF issues:
dhcwg@ietf.org. To join the mailing list, go to
the following site:
www1.ietf.org/mailman/listinfo/dhcwg
The following is the Internet Software Consortium Web
site, which includes information about the ISC DHCP soft-
ware and related mailing lists:
www.isc.org
The IETF Web site includes information about the IETF, a
list of IETF working groups, a schedule of upcoming meet-
ings, and proceedings from past meetings:
www.ietf.org
035 3273 App E 10/3/02 5:03 PM Page 519
APPENDIX E Bibliography and Other Resources520
The IETF Web site also includes a page for the DHCWG, which maintains links to all
current RFCs and Internet Drafts related to DHCP:
www.ietf.org/html.charters/dhc-charter.html
The following is the RFC Editor’s Web site, where you can find electronic copies of
RFCs referenced in this book:
www.rfc-editor.org
RFCs Related to DHCP
The following list includes all RFCs that pertain to DHCP specification, including
primary specification documents, options accepted as Internet Standards since the
DHCP specification was published, and a description of the current process for
submitting proposals for new DHCP options:
RFC 1534. Droms, R. “Interoperation Between DHCP and BOOTP.” October 1993.
RFC 2131. Droms, R. “Dynamic Host Configuration Protocol.” March 1997.
RFC 2132. Alexander, S., and R. Droms. “DHCP Options and BOOTP Vendor
Extensions.” March 1997.
RFC 2241. Provan, D. “DHCP Options for Novell Directory Services.”
November 1997.
RFC 2242. Droms, R., and K. Fong. “NetWare/IP Domain Name and Information.”
November 1997.
RFC 2485. Drach, S. “DHCP Option for the Open Group’s User Authentication
Protocol.” January 1998.
RFC 2563. Troll, R. “DHCP Option to Disable Stateless Auto-Configuration in IPv4
Clients.” May 1999.
RFC 2610. Perkins, C., and E. Guttman. “DHCP Options for Service Location
Protocol.” June 1999.
RFC 2937. Smith, C. “The Name Service Search Option for DHCP.” September 2000.
RFC 2939. Droms, R. “Procedures and IANA Guidelines for Definition of New DHCP
Options and Message Types.” September 2000.
RFC 3004. Stump, G., R. Droms, Y. Gu, R. Vyaghrapuri, A. Demirtjis, B. Beser, and J.
Privat. “The User Class Option for DHCP.” November 2000.
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RFC 3011. Waters, G. “The IPv4 Subnet Selection Option for DHCP.”
November 2001.
RFC 3046. Patrick, M. “DHCP Relay Agent Information Option.” January 2001.
RFC 3074. Volz, B., S. Gonczi, T. Lemon, and R. Stevens. “DHC Load Balancing
Algorithm.” February 2001.
RFC 3118. Droms, R., and W. Arbaugh. “Authentication for DHCP Messages.”
June 2001.
RFC 3203. T’Joens, Y., C. Hublet, and P. De Schrijver. “DHCP Reconfigure
Extension.” December 2001.
Other RFCs of Interest
RFC 790. Postel, J. ”Assigned Numbers.” September 1981.
RFC 791. Postel, J. “Internet Protocol.” September 1981.
RFC 792. Postel, J. “Internet Control Message Protocol.” September 1981.
RFC 821. Postel, J. “Simple Mail Transfer Protocol.” August 1982.
RFC 826. Plummer, D. C. “Ethernet Address Resolution Protocol: Or Converting
Network Protocol Addresses to 48-bit Ethernet Addresses for Transmission on
Ethernet Hardware.” November 1982.
RFC 854. Postel, J., and J. K. Reynolds. “Telnet Protocol Specification.” May 1983.
RFC 865. Postel, J. “Quote of the Day Protocol.” May 1983.
RFC 868. Postel, J., and K. Harrenstien. “Time Protocol.” May 1983.
RFC 887. Acetta, M. “Resource Location Protocol.” December 1983.
RFC 893. Leffler, S., and M. Karels. “Trailer Encapsulations.” April 1984.
RFC 894. Hornig, C. “Standard for the Transmission of IP Datagrams over Ethernet
Networks.” April 1984.
RFC 903. Finlayson, R., T. Mann, J. C. Mogul, and M. Theimer. “Reverse Address
Resolution Protocol.” June 1984.
RFC 950. Mogul, J. C., and J. Postel. “Internet Standard Subnetting Procedure.”
August 1985.
RFC 951. Croft, W. J., and J. Gilmore. “Bootstrap Protocol.” September 1985.
RFC 977. Kantor, B., and P. Lapsley. “Network News Transfer Protocol.”
February 1986.
Other RFCs of Interest 521
035 3273 App E 10/3/02 5:03 PM Page 521
RFC 988. Deering, S. “Host Extensions for IP Multicasting.” July 1986.
RFC 1001. NetBIOS Working Group in the Defense Advanced Research Projects
Agency, Internet Activities Board, End-to-End Services Task Force. “Protocol Standard
for a NetBIOS Service on a TCP/UDP Transport: Concepts and Methods.”
March 1987.
RFC 1002. NetBIOS Working Group in the Defense Advanced Research Projects
Agency, Internet Activities Board, End-to-End Services Task Force. “Protocol Standard
for a NetBIOS Service on a TCP/UDP Transport: Detailed Specifications.”
March 1987.
RFC 1035. Mockapetris, P. “Domain Names—Implementation and Specification.”
November 1987.
RFC 1042. Postel, J., and J. K. Reynolds. “Standard for the Transmission of IP
Datagrams over IEEE 802 Networks.” February 1988.
RFC 1048. Prindeville, P. A. “BOOTP Vendor Information Extensions.”
February 1988.
RFC 1122. Braden, R. T. “Requirements for Internet Hosts—Communication Layers.”
October 1989.
RFC 1123. Braden, R. T. “Requirements for Internet Hosts—Application and
Support.” October 1989.
RFC 1127. Braden, R. T. “Perspective on the Host Requirements RFCs.” October 1989.
RFC 1179. McLaughlin, L. “Line Printer Daemon Protocol”. August 1990.
RFC 1191. Mogul, J. C., and S. E. Deering. “Path MTU Discovery.” November 1990.
RFC 1256. Deering, S. E. “ICMP Router Discovery Messages.” September 1991.
RFC 1288. Zimmerman, D. “The Finger User Information Protocol.” December 1991.
RFC 1305. Mills, David L. “Network Time Protocol (Version 3) Specification,
Implementation.” March 1992.
RFC 1321. Rivest, R. “The MD5 Message-Digest Algorithm.” April 1992.
RFC 1459. Oikarinen, J., and D. Reed. “Internet Relay Chat Protocol.” May 1993.
RFC 1497. Reynolds, J. “BOOTP Vendor Information Extensions.” August 1993.
RFC 1519. Fuller, V., T. Li, J. Yu, and K. Varadhan. “Classless Inter-Domain Routing
(CIDR): An Address Assignment and Aggregation Strategy.” September 1993.
RFC 1542. Wimer, W. “Clarifications and Extensions for the Bootstrap Protocol.”
October 1993.
APPENDIX E Bibliography and Other Resources522
035 3273 App E 10/3/02 5:03 PM Page 522
RFC 1661. Simpson, W. (ed.). “The Point-to-Point Protocol (PPP).” July 1994.
RFC 1700. Reynolds, J., and J. Postel. “Assigned Numbers.” October 1994.
RFC 1819. Delgrossi, L., and L. Berger (eds.). “Internet Stream Protocol Version 2
(ST2) Protocol Specification—Version ST2+.” August 1995.
RFC 1878. Pummill, T., and B. Manning. “Variable Length Subnet Table for IPv4.”
December 1995.
RFC 1918. Rekhter, Y., B. Moskowitz, D. Karrenberg, G. J. de Groot, and E. Lear.
“Address Allocation for Private Internets.” February 1996.
RFC 1931. Brownell, D. “Dynamic RARP Extensions for Automatic Network Address
Acquisition.” April 1996.
RFC 1939. Myers, J., and M. Rose. “Post Office Protocol—Version 3.” May 1996.
RFC 1945. Berners-Lee, T., R. Fielding, and H. Frystyk. “Hypertext Transfer Protocol—
HTTP/1.0.” May 1996.
RFC 2002. Perkins, C. “IP Mobility Support.” October 1996.
RFC 2104. Krawczyk, H., M. Bellare, and R. Canetti. “HMAC: Keyed-Hashing for
Message Authentication.” February 1997.
RFC 2136. Vixie, P. (ed.), S. Thomson, Y. Rekhter, and J. Bound. “Dynamic Updates in
the Domain Name System (DNS UPDATE).” April 1997.
RFC 2165. Veizades, J., E. Guttman, C. Perkins, and S. Kaplan. “Service Location
Protocol.” June 1997.
RFC 2253. Wahl, M., S. Kille, and T. Howes. “Lightweight Directory Access Protocol
(v3): UTF-8 String Representation of Distinguished Names.” December 1997.
RFC 2373. Hinden, R., and S. E. Deering. “IP Version 6 Addressing Architecture.”
July 1998.
RFC 2464. Crawford, M. “Transmission of IPv6 Packets over Ethernet Networks.”
December 1998.
RFC 2535. Eastlake, D. “Domain Name System Security Extensions.” March 1999.
RFC 2608. Guttman, E., C. Perkins, J. Veizades, and M. Day. “Service Location
Protocol, Version 2.” June 1999.
Additional Reading
Albitz, P., and C. Liu. DNS and Bind. Sebastopol, CA: O’Reilly and Associates, 1998.
Comer, D. Internetworking with TCP/IP: Principles, Protocols, and Architecture. Upper
Saddle River, NJ: Prentice Hall, 1995.
Additional Reading 523
035 3273 App E 10/3/02 5:03 PM Page 523
ISO 9594; ISO 9594-1. “Information Processing Systems—Open Systems
Interconnection: The Directory—Overview of Concepts, Models and Services.”
International Organization for Standardization and International Electrotechnical
Committee. December 1998.
Stevens, W. R. TCP/IP Illustrated, Volume I: The Protocols. Reading, MA: Addison-
Wesley, 1994.
APPENDIX E Bibliography and Other Resources524
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F
DHCP Server and
Operating System
Versions
This appendix briefly describes the ISC and Microsoft
DHCP servers, with the intent of providing readers with an
idea of the different features to consider in any DHCP
server. It also describes some operating system dependen-
cies that are specific to the ISC DHCP server (which runs
on a variety of operating systems).
Choosing a DHCP Server
The ISC DHCP server and the Microsoft DHCP server are
not the only servers available today. Indeed, several other
DHCP servers exist that (although not as popular as the
ISC and Microsoft servers) are nicely implemented and
may be more or less appropriate, depending on your
needs. Following is a description of some of the advantages
and disadvantages of the ISC and Microsoft servers. You
can use this information to help compare other DHCP
servers as well.
Operating System Platforms
The first difference you are likely to notice between the
ISC and Microsoft DHCP servers is that the latter comes as
part of the Windows Server package for Windows NT,
Windows 2000, and Windows XP, and it runs only on that
operating system. The ISC DHCP server, on the other
hand, runs on many Unix and Unix-like systems, but it
does not run on any version of Microsoft Windows.
However, the ISC DHCP server comes with source code. So,
in theory, it can run on almost any system.
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