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Vijayabhaskar 2 Internet-Draft Hewlett-Packard 3 Expires: August 17, 2002 17 Feb 2002 5 NIS Configuration Options for DHCPv6 6 draft-ietf-dhc-dhcpv6-opt-nisconfig-00.txt 8 Status of this Memo 10 This document is an Internet-Draft and is in full conformance with 11 all provisions of Section 10 of RFC2026. 13 Internet-Drafts are working documents of the Internet Engineering 14 Task Force (IETF), its areas, and its working groups. Note that 15 other groups may also distribute working documents as Internet- 16 Drafts. 18 Internet-Drafts are draft documents valid for a maximum of six months 19 and may be updated, replaced, or obsoleted by other documents at any 20 time. It is inappropriate to use Internet-Drafts as reference 21 material or to cite them other than as "work in progress." 23 The list of current Internet-Drafts can be accessed at 24 http://www.ietf.org/ietf/1id-abstracts.txt. 26 The list of Internet-Draft Shadow Directories can be accessed at 27 http://www.ietf.org/shadow.html. 29 This Internet-Draft will expire on August 17, 2002. 31 Copyright Notice 33 Copyright (C) The Internet Society (2002). All Rights Reserved. 35 Abstract 37 This document describes four options for NIS-related configuration 38 information in DHCPv6: NIS Servers, NIS+ Servers, NIS Client Domain 39 Name, NIS+ Client Domain name. 41 1. Introduction 43 This document describes four options for configuration information 44 related to Network Information Service (NIS) in DHCPv6 [2]. 46 2. Requirements 48 The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, 49 SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this 50 document, are to be interpreted as described in RFC 2119 [1] 52 3. Terminology 54 This document uses terminology specific to IPv6 and DHCPv6 as defined 55 in section "Terminology" of the DHCP specification. 57 4. Network Information Service (NIS) Servers option 59 The Network Information Service Servers option provides a list of 60 one or more IP addresses of NIS servers available to the client. The 61 NIS servers SHOULD be listed in the order of preference. 63 The format of the Network Information Service Servers option is as 64 as shown below: 66 0 1 2 3 67 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 68 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 69 | OPTION_NIS_SERVERS | option-len | 70 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 71 | | 72 | NIS server (IP address) | 73 | | 74 | | 75 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 76 | | 77 | NIS server (IP address) | 78 | | 79 | | 80 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 81 | ... | 82 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 84 option-code: OPTION_NIS_SERVERS (tbd) 86 option-len: Length of the 'NIS server' fields in octets; It must be 87 a multiple of 16 89 NIS server: IP address of NIS server 91 5. Network Information Service V2 (NIS+) Servers option 93 The Network Information Service V2 (NIS+) Servers option provides 94 a list of one or more IP addresses of NIS+ servers available to 95 the client. The NIS+ servers SHOULD be listed in the order of 96 preference. 98 The format of the Network Information Service V2 (NIS+) Servers 99 option is as shown below: 101 0 1 2 3 102 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 103 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 104 | OPTION_NISP_SERVERS | option-len | 105 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 106 | | 107 | NIS+ server (IP address) | 108 | | 109 | | 110 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 111 | | 112 | NIS+ server (IP address) | 113 | | 114 | | 115 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 116 | ... | 117 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 119 option-code: OPTION_NISP_SERVERS (tbd) 121 option-len: Length of the 'NIS+ server' fields in octets; It must be 122 a multiple of 16 124 NIS+ server: IP address of NIS+ server 126 6. Network Information Service (NIS) Domain Name option 128 The Network Information Service (NIS) Domain Name option is used 129 by the server to convey client's NIS Domain Name info to the 130 client. 132 The format of the NIS Domain Name option is as shown below: 134 0 1 2 3 135 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 136 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 137 | OPTION_NIS_DOMAIN_NAME | option-len | 138 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 139 | nis-domain-name | 140 | ... | 141 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 143 option-code: OPTION_NIS_DOMAIN_NAME (tbd) 145 option-len: Length of the 'nis-domain-name' field in octets 147 nis-domain-name: NIS Domain name for client 149 The 'nis-domain-name' MUST be encoded as specified in section 150 "Representation and use of domain names" of the DHCPv6 151 specification [2]. 153 7. Network Information Service V2 (NIS+) Domain Name option 155 The Network Information Service V2 (NIS+) Domain Name option is 156 used by the server to convey client's NIS+ Domain Name info to the 157 client. 159 The format of the NIS+ Domain Name option is as shown below: 161 0 1 2 3 162 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 163 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 164 | OPTION_NISP_DOMAIN_NAME | option-len | 165 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 166 | nisp-domain-name | 167 | ... | 168 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 170 option-code: OPTION_NISP_DOMAIN_NAME (tbd) 172 option-len: Length of the 'nisp-domain-name' field in octets 174 nisp-domain-name: NIS+ Domain name for client 176 The 'nisp-domain-name' MUST be encoded as specified in section 177 "Representation and use of domain names" of the DHCPv6 178 specification [2]. 180 8. Appearance of these option 182 The NIS servers, NIS+ servers, NIS domain name and NIS+ domain name 183 options MUST appear only in the following messages: Solicit, 184 Advertise, Request, Confirm, Renew, Rebind, Information-Request, 185 Reply. 187 9. Security Considerations 189 The NIS servers, NIS+ servers, NIS domain name and NIS+ domain name 190 options may be used by an intruder DHCP server to assign invalid NIS 191 parameters, resulting in clients unable to use NIS. 193 To avoid attacks through these options, the DHCP client SHOULD use 194 authenticated DHCP (see section "Authentication of DHCP messages" 195 in the DHCPv6 specification [2]). 197 10. IANA Considerations 199 IANA is requested to assign an option code to these options from the 200 option-code space defined in section "DHCPv6 Options" of the DHCPv6 201 specification [2]. 203 References 205 [1] Bradner, S., "Key words for use in RFCs to Indicate Requirement 206 Levels", BCP 14, RFC 2119, March 1997. 208 [2] Bound, J., Carney, M., Perkins, C., Lemon, T., Volz, B. and R. 209 Droms (ed.), "Dynamic Host Configuration Protocol for IPv6 210 (DHCPv6)", draft-ietf-dhc-dhcpv6-23 (work in progress), February 211 2002. 213 Author's Addresses 215 Vijayabhaskar A K 216 Hewlett-Packard ESD-I 217 29, Cunningham Road 218 Bangalore - 560052 219 India 221 Phone: +91-080-2051424 222 EMail: vijayak@india.hp.com 224 Full Copyright Statement 226 Copyright (C) The Internet Society (2002). All Rights Reserved. 228 This document and translations of it may be copied and furnished to 229 others, and derivative works that comment on or otherwise explain it 230 or assist in its implementation may be prepared, copied, published 231 and distributed, in whole or in part, without restriction of any 232 kind, provided that the above copyright notice and this paragraph are 233 included on all such copies and derivative works. However, this 234 document itself may not be modified in any way, such as by removing 235 the copyright notice or references to the Internet Society or other 236 Internet organizations, except as needed for the purpose of 237 developing Internet standards in which case the procedures for 238 copyrights defined in the Internet Standards process must be 239 followed, or as required to translate it into languages other than 240 English. 242 The limited permissions granted above are perpetual and will not be 243 revoked by the Internet Society or its successors or assigns. 245 This document and the information contained herein is provided on an 246 "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING 247 TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING 248 BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION 249 HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF 250 MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 252 Acknowledgement 254 Funding for the RFC Editor function is currently provided by the 255 Internet Society.