Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-icnping-03.txt
Junxiao Shi <shijunxiao@email.arizona.edu> Mon, 11 April 2022 16:37 UTC
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In-Reply-To: <683DC592-2C9C-401B-91A7-46867EBFD773@dkutscher.net>
From: Junxiao Shi <shijunxiao@email.arizona.edu>
Date: Mon, 11 Apr 2022 12:36:35 -0400
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To: Dirk Kutscher <ietf@dkutscher.net>
Cc: Spyridon Mastorakis <smastorakis=40unomaha.edu@dmarc.ietf.org>, icnrg@irtf.org, "David R. Oran" <daveoran@orandom.net>
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Subject: Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-icnping-03.txt
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Hi Dirk Yes, I looked at the diff from -05 revision and I believe the errors have been corrected. Yours, Junxiao On Mon, Apr 11, 2022 at 6:23 AM Dirk Kutscher <ietf@dkutscher.net> wrote: > Hi Junxiao, > > Thanks for paying attention and for the additional comments. > > Can you check whether your issues have been addressed? > > Thanks, > Dirk > > > On 8 Apr 2022, at 21:15, Spyridon Mastorakis wrote: > > Thanks for the comments, Junxiao. The drafts have been updated and your > comments have been addressed. > > Spyros > > — > > Spyridon (Spyros) Mastorakis, Ph.D. > Assistant Professor > Computer Science Department > University of Nebraska at Omaha > Peter Kiewit Institute Room 174E > Associate Editor, IEEE Internet of Things Journal > Director, Ph.D. Program in Information Technology > Website: https://sites.google.com/site/spyridonmastorakis > > On Apr 5, 2022, at 6:39 AM, David R. Oran <daveoran@orandom.net> wrote: > > Non-NU Email > > Thanks! > We’ll get these fixed quickly. > > On 4 Apr 2022, at 11:57, Junxiao Shi wrote: > > Hi Spyros > > I have inspected the diff between -03 and -4. Certain errors are not fully > fixed. See comments inline. > > New problem: in references > > [NDNTLV] "NDN Packet Format Specification.", 2016, > < > https://urldefense.com/v3/__http://named-data.net/doc/ndn-tlv/__;!!PvXuogZ4sRB2p-tU!Xz_WVwqvAcMkJkLusl_deBsZ2d92QSiVeCmfC6bOzFHRjdZdhj71JsWc0R-MLFGprkAL$ > > . > > The current spec link is: > > https://urldefense.com/v3/__https://named-data.net/doc/NDN-packet-spec/current/__;!!PvXuogZ4sRB2p-tU!Xz_WVwqvAcMkJkLusl_deBsZ2d92QSiVeCmfC6bOzFHRjdZdhj71JsWc0R-MLKV7kvFM$ > . It was last updated > in 2022. > You can also cite a specific version on > > https://urldefense.com/v3/__https://github.com/named-data/NDN-packet-spec__;!!PvXuogZ4sRB2p-tU!Xz_WVwqvAcMkJkLusl_deBsZ2d92QSiVeCmfC6bOzFHRjdZdhj71JsWc0R-MLMaxcvab$ > using a commit hash. > > On Sun, Mar 6, 2022 at 6:52 PM Spyridon Mastorakis < > smastorakis@unomaha.edu> > wrote: > > *External Email* > Dear Junxiao, > > Thank you for your comments. We have addressed them in the updated > versions of our drafts that we just uploaded. Please see below for more > details: > > On Dec 13, 2021, at 9:00 AM, Junxiao Shi <shijunxiao@email.arizona.edu> > wrote: > > Non-NU Email > ------------------------------ > Dear folks > > I had a look at the NDN encoding for ICN Ping Protocol rev03. > It seems that the protocol partially assumes NDN packet format v0.2, and > is incompatible with the current NDN packet format. > > As of 2019-May > < > https://urldefense.com/v3/__https://redmine.named-data.net/issues/4853__;!!PvXuogZ4sRB2p-tU!R1XTGYwBlOXYUAzHhlV6sAyjq-Qz47wI4GLKSybSpxaQ2vKKrLONq9piKdxFWKR6IgjQ$> > , > the NDN packet encoding is written with IETF ABNF syntax. > However, ICN Ping still specifies its encoding with W3C EBNF syntax, which > could lead to confusion. > > > Fixed. We converted the packet encoding to the ETF ABNF syntax. > > > RFC5234 < > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/rfc5234__;!!PvXuogZ4sRB2p-tU!Xz_WVwqvAcMkJkLusl_deBsZ2d92QSiVeCmfC6bOzFHRjdZdhj71JsWc0R-MLHhiZDl2$ > > defines the IETF > ABNF syntax. NDN packet encoding follows this specification. > In this syntax, a rule is defined by the following sequence: > > name = elements crlf > > However, draft-irtf-icnrg-icnping-04 Section 5.2 is still defining a rule > with ::= operator. > > The Parameters element is meant to contain PathSteering TLV. > > As suggested below, it may make sense to move it to the NDNLPv2 header. > > Section 5.2 defines Ping Echo Reply to be a Data packet with ContentType=0 > and FreshnessPeriod=0. > Since ContentType defaults to 0 and FreshnessPeriod defaults to 0, neither > field is necessary. > > Importantly, the NDN protocol specifies > < > https://urldefense.com/v3/__https://named-data.net/doc/NDN-packet-spec/current/data.html*freshnessperiod__;Iw!!PvXuogZ4sRB2p-tU!R1XTGYwBlOXYUAzHhlV6sAyjq-Qz47wI4GLKSybSpxaQ2vKKrLONq9piKdxFWGIoTdsr$ > > > : > > If the Data does not have a FreshnessPeriod or if it has a FreshnessPeriod > equal to zero, it MUST be immediately marked “non-fresh”. > If an Interest contains MustBeFresh element, a node MUST NOT return > “non-fresh” Data in response to this Interest. > > This rule applies to not only the Content Store, but also the forwarding > pipelines. > Based on this rule, the Ping Echo Reply packet does not satisfy the Ping > Echo Request packet, making the ICN Ping incompatible with the current NDN > packet format. > > > We aim to avoid fetching cached responses from the network (unless a > request’s base name matches the name of a content object in the CS of a > forwarder and the client is ok with receiving a cached response). To do > that in the first place, the operation of a forwarder needs to be different > than how NFD works right now. So we do not think this is an issue with the > packet format per se, but rather the operation of the forwarder, which > needs to be extended/modified to handle ping and traceroute traffic. > > > draft-irtf-icnrg-icnping-04 Section 5.1 says: > > Since the NDN packet format does not provide a mechanism to prevent the > network from caching specific data packets, we use the MustBeFresh element > for echo requests (in combination with a Freshness Period TLV of value 0 > for echo replies) to avoid fetching cached echo replies with an expired > freshness period. > > > This still will not work, because an Interest with MustBeFresh cannot be > satisfied by a non-fresh Data. > This is enforced not only in NDN forwarders, but also in NDN libraries. > > To minimize caching effect, you can either set FreshnessPeriod to 1 (not > 0), or use a unique name each time (you are already doing this by adding a > random nonce component), or both. > > > Section 5.2 inserts a "PathSteering TLV" in the Data packet, which appears > before the Name element. > The TLV evolvability guidelines of the NDN protocol does not permit adding > new elements before the Name element. > New elements should be added later in the packet; to exclude an element > from the security envelope, it should appear after the SignatureValue > element. > > > Good point. We have moved the PathSteering TLV after the Signature TLV. > > In the case of PathSteering TLV that "might be modified in a hop-by-hop > fashion", it does not belong in the network layer, but should be added as a > link layer header in NDNLPv2 or another link layer protocol. > > The "PathSteering TLV" cites draft-oran-icnrg-pathsteering, but that > document only defines a "Path label TLV". > Its TLV-TYPE number assignment is 0x09, but that number is a "critical" > TLV-TYPE number that would cause a forwarder that does not understand this > feature to drop the packet; this choice needs justification. > Moreover, 0x09 is marked as reserved > < > https://urldefense.com/v3/__https://named-data.net/doc/NDN-packet-spec/current/types.html__;!!PvXuogZ4sRB2p-tU!R1XTGYwBlOXYUAzHhlV6sAyjq-Qz47wI4GLKSybSpxaQ2vKKrLONq9piKdxFWM33PpJJ$> > because > it conflicts with the former Selectors element in NDN packet format v0.2, > so that you may need to choose a different number. > You can then propose a change > < > https://urldefense.com/v3/__https://gerrit.named-data.net/admin/repos/NDN-TLV__;!!PvXuogZ4sRB2p-tU!R1XTGYwBlOXYUAzHhlV6sAyjq-Qz47wI4GLKSybSpxaQ2vKKrLONq9piKdxFWA18J1X7$> > to > reserve the number in NDN network layer protocol or edit this page > < > https://urldefense.com/v3/__https://redmine.named-data.net/projects/nfd/wiki/NDNLPv2__;!!PvXuogZ4sRB2p-tU!R1XTGYwBlOXYUAzHhlV6sAyjq-Qz47wI4GLKSybSpxaQ2vKKrLONq9piKdxFWIEfRn16$> > to > reserve the number in NDNLPv2. > > > To some extent, this sounds like an open question to us (i.e., whether > PathSteering TLV should be a part of the encoding of the base NDN protocol > or should be included in NDNLPv2). Nevertheless, we believe that since a > field like HopCount (whose value changes on a hop-by-hop basis) is in the > base NDN protocol rather than NDNLP, path steering should also be in the > base protocol, since it too is a hop-by-hop field independent of a > particular single hop. > > > The "PathSteering TLV" cites draft-oran-icnrg-pathsteering > < > https://urldefense.com/v3/__https://www.ietf.org/archive/id/draft-oran-icnrg-pathsteering-05.html__;!!PvXuogZ4sRB2p-tU!Xz_WVwqvAcMkJkLusl_deBsZ2d92QSiVeCmfC6bOzFHRjdZdhj71JsWc0R-MLLgu6Y3D$ > > , > but that document only defines a "Path label TLV", and its encoding differs > from what's given in Figure 9. > > Yours, Junxiao > > > _______________________________________________ > icnrg mailing list > icnrg@irtf.org > > https://urldefense.com/v3/__https://www.irtf.org/mailman/listinfo/icnrg__;!!PvXuogZ4sRB2p-tU!Xz_WVwqvAcMkJkLusl_deBsZ2d92QSiVeCmfC6bOzFHRjdZdhj71JsWc0R-MLBoVZn8p$ > > DaveO > > > _______________________________________________ > icnrg mailing list > icnrg@irtf.org > https://www.irtf.org/mailman/listinfo/icnrg > > *External Email* >
- [icnrg] I-D Action: draft-irtf-icnrg-icnping-03.t… internet-drafts
- Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-ic… Junxiao Shi
- Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-ic… David R. Oran
- Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-ic… Spyridon Mastorakis
- Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-ic… Junxiao Shi
- Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-ic… David R. Oran
- Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-ic… Spyridon Mastorakis
- Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-ic… Dirk Kutscher
- Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-ic… Junxiao Shi
- Re: [icnrg] [EXT] I-D Action: draft-irtf-icnrg-ic… Dirk Kutscher