--- 1/draft-ietf-dhc-relay-port-05.txt 2017-08-28 16:13:19.061581240 -0700 +++ 2/draft-ietf-dhc-relay-port-06.txt 2017-08-28 16:13:19.085581815 -0700 @@ -1,18 +1,18 @@ Networking Working Group N. Shen Internet-Draft E. Chen Intended status: Standards Track Cisco Systems -Expires: October 27, 2017 April 25, 2017 +Expires: March 1, 2018 August 28, 2017 Generalized UDP Source Port for DHCP Relay - draft-ietf-dhc-relay-port-05 + draft-ietf-dhc-relay-port-06 Abstract This document proposes an extension to the DHCP protocols that allows a relay agent to receive packets from a server or an upstream relay agent on any UDP port, not just the default port 67 for IPv4 or default port 547 for IPv6. Status of This Memo @@ -22,21 +22,21 @@ Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. 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." - This Internet-Draft will expire on October 27, 2017. + This Internet-Draft will expire on March 1, 2018. Copyright Notice Copyright (c) 2017 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 @@ -166,25 +166,26 @@ paragraph. A DHCP relay agent can listen for DHCP messages from a server or another upstream relay agent device on any valid UDP port available in the relay system including the DHCP UDP port 547. The default UDP port is 547 if there is no explicit configuration for the generalized UDP source port extension for DHCP relay. 4. Relay Source Port Sub-option and Option - Although a DHCP server can implicitly determine the UDP source port - when it receives a message from a relay agent, this sub-option makes - the request explicit for the server to use a non-DHCP UDP port in the - reply message. When IPv6 cascaded relay agents are involved, the - downstream non-DHCP UDP port needs to be recorded using the option. + Relay agents do not maintain state. To return a message to its + source, the relay agent must include all the required information in + the Relay-Forward message. When a relay in a sequence of cascaded + relays does not use the standard source port, that source port must + be included along with the source address. This option allows the + relay agent to do so. 4.1. Source Port Sub-option for DHCPv4 The Relay Agent "Source Port Sub-option" is a new option, and it is part of the relay-agent-information option for DHCPv4 [RFC3046]. The format of the "Source Port Sub-option" is shown below: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | SubOpt Code | Len | @@ -363,39 +364,39 @@ The authors would like to thank Bernie Volz for discussions that led to the definition of The Relay Source Port sub-option and DHCPv6 Relay Source Port Option. The RFC text was produced using Marshall Rose's xml2rfc tool. 10. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, - DOI 10.17487/RFC2119, March 1997, - . + DOI 10.17487/RFC2119, March 1997, . [RFC2131] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, DOI 10.17487/RFC2131, March 1997, - . + . [RFC3046] Patrick, M., "DHCP Relay Agent Information Option", RFC 3046, DOI 10.17487/RFC3046, January 2001, - . + . [RFC3118] Droms, R., Ed. and W. Arbaugh, Ed., "Authentication for DHCP Messages", RFC 3118, DOI 10.17487/RFC3118, June 2001, - . + . [RFC3315] Droms, R., Ed., Bound, J., Volz, B., Lemon, T., Perkins, C., and M. Carney, "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)", RFC 3315, DOI 10.17487/RFC3315, July - 2003, . + 2003, . Authors' Addresses Naiming Shen Cisco Systems 560 McCarthy Blvd. Milpitas, CA 95035 US Email: naiming@cisco.com