[MMUSIC] [Technical Errata Reported] RFC5245 (3619)
RFC Errata System <rfc-editor@rfc-editor.org> Tue, 14 May 2013 04:21 UTC
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Date: Mon, 13 May 2013 21:21:07 -0700
Cc: akundu@us.ibm.com, mmusic@ietf.org, rfc-editor@rfc-editor.org
Subject: [MMUSIC] [Technical Errata Reported] RFC5245 (3619)
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The following errata report has been submitted for RFC5245, "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols". -------------------------------------- You may review the report below and at: http://www.rfc-editor.org/errata_search.php?rfc=5245&eid=3619 -------------------------------------- Type: Technical Reported by: Ashish Kundu <akundu@us.ibm.com> Section: Section 4, 5 Original Text ------------- Missed candidate pair in ICE standard Corrected Text -------------- Scenario: X is caller, Z is callee. X is behind a non-full-cone (such as symmetric) NAT, Z is behind a full-cone NAT. ICE standard: Section 2.1 of RFC5245 describes the addresses that are collected as candidate addresses: (local address, server-reflexive address, TURN relay address). For X: (X:x, X1:x1, Yx:yx), and for Z: (Z:z, Z1:z1, Yz:yz). Missed candidate pair in ICE standard: 1. X:x sends a connection check message to the Z1:z1 (as part of the process in Section 2.2 of the standard) 2. Since X is behind a non-full cone NAT such a symmetric one, NAT of X maps X:x to X2:x2, sends the message to Z1:z1 3. Z is behind a full-cone NAT, so packets received at Z1:z1 address is forwarded to Z:z by the NAT Since X is behind a non-full cone NAT such a symmetric one and Z is behind a full-cone NAT, connection from X:x to Z1:z1 would be via a server-reflexive address X2:x2 of X, which is not a candidate address for X as specified by ICE. X2:x2 should be a candidate address of X, which however can only be determine when X sends a message to Z. The pair (X2:x2, Z1:z1) provides a direct connection option between X and Y. Conditions on which X2:x2 is a valid candidate address: 1. One of the peers (Z) is behind a full-cone NAT, else step 3 above does not succeed. 2. X2:x2 is unique, i.e., different from X1:x1 (already covered by Section 2.1) if and only if one of the peers is behind a non-full-cone NAT. So I think there should be two stages in the candidate collection process: A: Section 2.1 -- candidate addresses independent of the other clients B: collection of the candidate pairs with respect to the peer, such as X2:x2 and Z2:z2, if any. B consists of the following steps including 1, 2, and 3: 4. Z:z determines if X2:x2 from which it received the message is a different address than in the candidate set of X. 5. If 4 is true, then send an OK message to X2:x2 that it received the message with X2:x2 XOR-encoded. 6. X:x receives the OK message in 4, then X:x determines X2:x2 as its new candidate address. If X:x decides to establish the connection via X2:x2, it sends ACK message to Z2:z2. Notes ----- This feedback for improvement of ICE candidate gathering and decision process was sent to Dr. Rosenberg on Nov 09, 2012. However, since I have not received any response from him over my next two followups and this e-mail, I thought it should be reported via this method. This is not an error mesage, but a method to improve the candidate gathering and decision process of ICE. Instructions: ------------- This errata is currently posted as "Reported". If necessary, please use "Reply All" to discuss whether it should be verified or rejected. When a decision is reached, the verifying party (IESG) can log in to change the status and edit the report, if necessary. -------------------------------------- RFC5245 (draft-ietf-mmusic-ice-19) -------------------------------------- Title : Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols Publication Date : April 2010 Author(s) : J. Rosenberg Category : PROPOSED STANDARD Source : Multiparty Multimedia Session Control Area : Real-time Applications and Infrastructure Stream : IETF Verifying Party : IESG
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