Re: [Int-area] Discussion about Section 6.1 in draft-ietf-intarea-frag-fragile
Ole Troan <otroan@employees.org> Fri, 06 September 2019 14:50 UTC
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From: Ole Troan <otroan@employees.org>
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Date: Fri, 06 Sep 2019 16:50:21 +0200
Cc: Bob Hinden <bob.hinden@gmail.com>, "int-area@ietf.org" <int-area@ietf.org>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, IESG <iesg@ietf.org>, Joel Halpern <joel.halpern@ericsson.com>, "draft-ietf-intarea-frag-fragile@ietf.org" <draft-ietf-intarea-frag-fragile@ietf.org>, Suresh Krishnan <suresh@kaloom.com>, "intarea-chairs@ietf.org" <intarea-chairs@ietf.org>
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To: Joe Touch <touch@strayalpha.com>
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Subject: Re: [Int-area] Discussion about Section 6.1 in draft-ietf-intarea-frag-fragile
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Joe, > Comments below. > >> On Sep 5, 2019, at 11:33 PM, Ole Troan <otroan@employees.org> wrote: >> >> Bob, et al, >> >> I have two issues with this text. >> >> 1) It introduces something new and undescribed in paragraph 2. >> "unless they also include mechanisms to detect that IP fragmentation isn't working >> reliably." >> That seems like hand-waving to me. Suggest deleting. > > Fragmentation success or failure is directly testable. Any feedback mechanism will work and specific ones are mentioned elsewhere (PLPMTUD). > > This differs from ICMP black-holing in path MTU detection. Can you please point me to where in the PLPMTUD document testing for IP fragmentation is described? I thought PLPMTUD found the largest unfragmented size of a datagram. >> 2) Paragraph 4: >> "The risks of IP fragmentation can also be mitigated >> through the use of encapsulation, e.g., by transmitting IP fragments >> as payloads." >> >> This seems like proposing new unspecified solutions with it's own set >> of considerations. > > Specific widely-deployed methods are mentioned elsewhere in the doc, including GRE and UDP. Sorry, I couldn't find those either. Inner fragmentation, firstly is only applicable to IPv4. And only applicable to tunnels. And both those specs go to great length in avoiding fragmentation. >> IP fragmentation is a general solution to all hosts, >> encapsulation is certainly not in every host, > > Actually, it is - unless you’re claiming hosts don’t support UDP. Sorry, I don't understand what you mean. Are you saying that a new UDP applications should support the following stack: IPv6 + UDP + IPv6 + FH + UDP + Applcation data So to be able to hide IP fragments from the network? While still having to do the full PLPMTUD to function correctly? >> and has different >> properties with regards to NAT traversal etc. > > If by “different” you mean “much more likely to succeed”, agreed. I need to see numbers of that. But regardless I don't see the relevance to this document. >> vAlso if encapsulation >> was the answer, other segmentation / reassembly that were tunnel >> specific could be developed. > > It is and is widely used - IPsec tunnels over UDP, e.g. That's a encapsulated solution to start with. >> Regardless this also amounts of hand-waving >> and doesn't seem to offer any advice that can be heeded now. >> And of course encapsulation can also exacerbate the problem >> by increasing packet size. > > Yes, it makes the fragments smaller, which may be additional effort/performance impact, but it completely hides its impact on successful forwarding. You may be making a point. I'm afraid I don't get it. Cheers, Ole
- [Int-area] Alissa Cooper's No Objection on draft-… Alissa Cooper via Datatracker
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fernando Gont
- Re: [Int-area] Alissa Cooper's No Objection on dr… Tom Herbert
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fernando Gont
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fernando Gont
- Re: [Int-area] Alissa Cooper's No Objection on dr… Tom Herbert
- Re: [Int-area] Alissa Cooper's No Objection on dr… Bob Hinden
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Bob Hinden
- Re: [Int-area] Alissa Cooper's No Objection on dr… Tom Herbert
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fernando Gont
- Re: [Int-area] Alissa Cooper's No Objection on dr… Bob Hinden
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Ole Troan
- Re: [Int-area] Alissa Cooper's No Objection on dr… Tom Herbert
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fernando Gont
- Re: [Int-area] Alissa Cooper's No Objection on dr… Black, David
- Re: [Int-area] Alissa Cooper's No Objection on dr… Bob Hinden
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fernando Gont
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Ole Troan
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Bob Hinden
- Re: [Int-area] Alissa Cooper's No Objection on dr… Ole Troan
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Ron Bonica
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fred Baker
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fred Baker
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fernando Gont
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fernando Gont
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Tom Herbert
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fernando Gont
- Re: [Int-area] Alissa Cooper's No Objection on dr… Templin (US), Fred L
- Re: [Int-area] Alissa Cooper's No Objection on dr… Warren Kumari
- [Int-area] Discussion about Section 6.1 in draft-… Bob Hinden
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Bob Hinden
- Re: [Int-area] Discussion about Section 6.1 in dr… Joel Halpern
- Re: [Int-area] Discussion about Section 6.1 in dr… Tom Herbert
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Bob Hinden
- Re: [Int-area] Discussion about Section 6.1 in dr… Bob Hinden
- Re: [Int-area] Discussion about Section 6.1 in dr… Warren Kumari
- Re: [Int-area] Discussion about Section 6.1 in dr… Ron Bonica
- Re: [Int-area] Discussion about Section 6.1 in dr… Tom Herbert
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Bob Hinden
- Re: [Int-area] Discussion about Section 6.1 in dr… Ron Bonica
- Re: [Int-area] Discussion about Section 6.1 in dr… Ole Troan
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Ole Troan
- Re: [Int-area] Discussion about Section 6.1 in dr… Tom Herbert
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Ole Troan
- Re: [Int-area] Discussion about Section 6.1 in dr… Ole Troan
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Tom Herbert
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Tom Herbert
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Ole Troan
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Bob Hinden
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Fernando Gont
- Re: [Int-area] Discussion about Section 6.1 in dr… Bob Hinden
- Re: [Int-area] Alissa Cooper's No Objection on dr… Fred Baker
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Brian E Carpenter
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Brian E Carpenter
- Re: [Int-area] Alissa Cooper's No Objection on dr… Joe Touch
- Re: [Int-area] Alissa Cooper's No Objection on dr… Brian E Carpenter
- Re: [Int-area] Discussion about Section 6.1 in dr… Fernando Gont
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Geoff Huston
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Bob Hinden
- Re: [Int-area] Discussion about Section 6.1 in dr… Brian E Carpenter
- Re: [Int-area] Discussion about Section 6.1 in dr… Ron Bonica
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Ole Troan
- Re: [Int-area] Discussion about Section 6.1 in dr… Fred Baker
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Templin (US), Fred L
- Re: [Int-area] Discussion about Section 6.1 in dr… Joe Touch
- Re: [Int-area] Discussion about Section 6.1 in dr… Fred Baker