INTERNET-DRAFT Krzysztof Grochla Intended Status: (Proximetry) Expires: March 2, 2011 August 29 2010 IEEE 802.11 parameters DHCP Option draft-grochla-80211-dhcp-option-00 Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on February 26, 2011. Copyright and License Notice Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Krzysztof Grochla Expires March 2, 2011 [Page 1] INTERNET DRAFT IEEE 802.11 parameters DHCP Option August 29, 2010 Abstract The wireless access points and other devices requires configuration of parameters such as channel, ESSID. This document describes the DHCP options to be used to configure these parameters. Table of Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Terminology . . . . . . . . . . . . . . . . . . . . . . . . 3 2 IEEE 802.11 radio configuration DCHP option . . . . . . . . . . 4 3 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 4. Security consideration . . . . . . . . . . . . . . . . . . . . . 5 5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5 6. References . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6.1. Normative References . . . . . . . . . . . . . . . . . . . 5 Author's Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5 Krzysztof Grochla Expires March 2, 2011 [Page 2] INTERNET DRAFT IEEE 802.11 parameters DHCP Option August 29, 2010 1 Introduction The IEEE 802.11 networks are very popular for providing Internet access. The IP address of wireless network access points are typically configured using DHCP protocol, but require manual configuration of radio parameters. There exists also a few autoconfiguration schemas for wireless mesh networks relaying on DHCP protocol to configure the 802.11 interfaces. The additional options proposed in this document allow to use DHCP to provide the radio parameters in addition to the IP address, allowing to enable the autoconfiguration procedure. This option may be also used for easy manual configuration of basic parameters of wireless access points in one central point and distributing it by DHCP protocol. 1.1 Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. Krzysztof Grochla Expires March 2, 2011 [Page 3] INTERNET DRAFT IEEE 802.11 parameters DHCP Option August 29, 2010 2 IEEE 802.11 radio configuration DCHP option This section defines the DHCP option that configures the SSID and the channel number of IEEE 802.11 network. The options have the same structure for both DHCPv4 and DHCPv6. The option has the format shown on the following figure: 0 1 2 3 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | option-code | option-length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | channel | SSID length | | +---------------+---------------+ + | | + + | SSID | + + | | + + | | + + | | + + | | + + | | + +-------------------------------| | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ option-code: OPTION_80211_CHANN_SSID (TBD) option-length: Length of the option in octet, must be multiple of sixteen (16). A DHCP client while requesting the parameters for a IEEE 802.11 interface that supports this option MAY request the 80211 Channel and SSID option. The DHCP server returns the option to the client if the server policy is configured to do so. The SSID and channel may be preconfigured or selected by any algorithm implemented on the server side. If the option is received the interface SHOULD be configured to SSID and channel transmitted, as long as they are valid for the device. Krzysztof Grochla Expires March 2, 2011 [Page 4] INTERNET DRAFT IEEE 802.11 parameters DHCP Option August 29, 2010 3 IANA Considerations The following DHCP option code for channel and SSID assignment must be assigned by IANA: Option Name Value Described in --------------------------------------------------- OPTION_80211_CHANN_SSID TBD Section 2 4. Security consideration The security considerations in [RFC2131], [RFC2132] and [RFC3315] apply. If an adversary manages to modify the response from a DHCP server or insert its own response, the interface may be configured to a SSID and channel provided by the intruder. In security sensitive environment this should be taken into consideration by network administrator. 5. Acknowledgments The following individuals are acknowledged for their contributions to this protocol specification: Walter Buga 6. References 6.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2131] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, March 1997. [RFC2132] Alexander, S. and R. Droms, "DHCP Options and BOOTP Vendor Extensions", RFC 2132, March 1997 Author's Addresses Krzysztof Grochla, Proximetry Poland, Al. Rozdzienskiego 91 40-203 Katowice, Poland EMail: kgrochla@proximetry.com Krzysztof Grochla Expires March 2, 2011 [Page 5]