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Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 Network Working Group Yakov Rekhter, cisco Systems 3 INTERNET DRAFT Ralph Droms, Bucknell University 4 Obsoletes: draft-ietf-dhc-fqdn-opt-01.txt March 1997 5 Expires September 1997 7 An option for FQDNs in DHCP options 8 10 Status of this Memo 12 This document is an Internet-Draft. Internet-Drafts are working 13 documents of the Internet Engineering Task Force (IETF), its areas, 14 and its working groups. Note that other groups may also distribute 15 working documents as Internet-Drafts. 17 Internet-Drafts are draft documents valid for a maximum of six months 18 and may be updated, replaced, or obsoleted by other documents at any 19 time. It is inappropriate to use Internet-Drafts as reference 20 material or to cite them other than as ``work in progress.'' 22 To learn the current status of any Internet-Draft, please check the 23 ``1id-abstracts.txt'' listing contained in the Internet-Drafts Shadow 24 Directories on ftp.is.co.za (Africa), nic.nordu.net (Europe), 25 munnari.oz.au (Pacific Rim), ds.internic.net (US East Coast), or 26 ftp.isi.edu (US West Coast). 28 Abstract 30 DHCP [DHCP] can be used to automate the process of configuring TCP/IP 31 host computers. However, some of the DHCP options carry IP addresses 32 rather than Fully Qualified Domain Names (FQDN). Use of IP addresses 33 constrains the DHCP client to use the addresses that were in use at 34 the time the client received its configuration information; these 35 addresses may change over time, (e.g., a server may be assigned a new 36 IP address), so that the IP addresses used by the client may become 37 invalid. 39 An alternative to passing IP addresses is to pass FQDNs instead of 40 (numeric) IP addresses. Doing this allows to defer binding between a 41 particular network entity (e.g., a server) and its IP address until 42 run time. As stated in [Carpenter:96], "Deferring the binding avoids 43 the risk of changed mapping between IP addresses and specific network 44 entities (due to changing addressing information). Moreover, 45 reliance on FQDNs (rather than IP addresses) also localizes to the 46 DNS the changes needed to deal with changing addressing information 47 due to renumbering." 48 This document defines a new DHCP option that allows the use of FQDNs 49 instead of IP addresses in DHCP options. 51 1. FQDN Option 53 The FQDN option allows the use of FQDNs rather than IP addresses in 54 DHCP options. The FQDN option contains other DHCP options, which 55 then carry FQDNs rather than IP addresses as data. 57 The code for the FQDN option is 89. The Len field gives the total 58 length of all of the DHCP options contained in the FQDN option. The 59 Code, Len, Subcode and Sublen are all one octet long. The FQDN field 60 is variable length. 62 For each subcode carried in the FQDN option, the IP address in the 63 option represented by the subcode is replaced by a FQDN. 65 The Sublen field shall be set to the length (in octets) of the FQDN 66 carried in the option. The FQDN field carries the FQDN itself. 68 +----------+----------+ 69 | Code | Len | 70 +----------+----------+---------+-----------+-------------------- 71 | Subcode | Sublen | FQDN 72 +----------+----------+---------+-----------+-------------------- 74 .................. 76 +----------+----------+---------+-----------+-------------------- 77 | Subcode | Sublen | FQDN 78 +----------+----------+---------+-----------+-------------------- 80 1.1 DHCP options containing a list of parameters 82 More that one triple with a given subcode may appear within a single 83 FQDN option. The FQDNs contained in triples with the same subcode 84 should be treated as a list of parameters for the DHCP option 85 represented by the subcode. 87 Because FQDNs are variable length, lists of FQDNs cannot be encoded 88 in DHCP options within the FQDN option. DHCP Options that can carry 89 a list of IP addresses should be coded as multiple subcodes in the 90 FQDN option, to differentiate among the variable-length FQDNs. 92 This option only allows the use of FQDNs for options that have been 93 elsewhere defined to carry IP addresses. 95 1.2 Example 97 The following illustrates how the FQDN option could be used to carry 98 FQDNs for 2 LPR Servers with FQDNs lpr1.xxx.org and lpr2.yy.org, and 99 one Network Information Server with FQDN nis.zzzz.org. 101 +---+---+ 102 |xx |41 | 103 +---+---+---+---+---+---+---+---+---+---+---+---+---+---+ 104 |41 |12 | n | i | s | . | z | z | z | z | . | o | r | g | 105 +---+---+---+---+---+---+---+---+---+---+---+---+---+---+ 106 | 9 |12 | l | p | r | 1 | . | x | x | x | . | o | r | g | 107 +---+---+---+---+---+---+---+---+---+---+---+---+---+---+ 108 | 9 |11 | l | p | r | 2 | . | y | y | . | o | r | g | 109 +---+---+---+---+---+---+---+---+---+---+---+---+---+ 111 2. Security Considerations 113 Security issues are not discussed in this document. 115 3. References 117 [Carpenter:96] Carpenter, B., Rekhter, Y., "Renumbering needs work", 118 RFC1900, February 1996. 120 [DHCP] Droms, R., "Dynamic Host Configuration Protocol", RFC1541, 121 October 1993. 123 4. Acknowledgments 125 The authors gratefully acknowledge the input and review of the 126 Dynamic Host Configuration working group. They also thank cisco 127 Systems and Bucknell University for their support in the development 128 of this document. 130 5. Author Information 132 Yakov Rekhter 133 cisco Systems, Inc. 134 170 Tasman Dr. 135 San Jose, CA 95134 136 Phone: (914) 528-0090 137 email: yakov@cisco.com 139 Ralph Droms 140 Computer Science Department 141 323 Dana Engineering 142 Bucknell University 143 Lewisburg, PA 17837 144 Phone: (717) 524-1145 145 email: droms@bucknell.edu