Re: [core] [Dots] Large asynchronous notifications under DDoS: New BLOCK Option?
Jon Shallow <supjps-ietf@jpshallow.com> Thu, 09 April 2020 11:27 UTC
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From: Jon Shallow <supjps-ietf@jpshallow.com>
To: 'Achim Kraus' <achimkraus@gmx.net>, 'Carsten Bormann' <cabo@tzi.org>, mohamed.boucadair@orange.com, cabo@tzi.org, dots@ietf.org, core@ietf.org
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Date: Thu, 09 Apr 2020 12:27:17 +0100
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Subject: Re: [core] [Dots] Large asynchronous notifications under DDoS: New BLOCK Option?
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Hi Achim, I hear you. How about extending the NonBLock2 option to contain more information. E.g. o the size of the block (SZX); o whether more blocks are following (M); o the relative number of the block (NUM) within a sequence of blocks with the given size. o the block set id (like the IPv4 fragment id field) for re-assembly. Thus making the nonblock2 option length 0 to, say, 7 bytes long. Regards Jon > -----Original Message----- > From: Dots [mailto: dots-bounces@ietf.org] On Behalf Of Achim Kraus > Sent: 09 April 2020 12:02 > To: Jon Shallow; 'Carsten Bormann'; mohamed.boucadair@orange.com; > dots@ietf.org; core@ietf.org > Subject: Re: [Dots] [core] Large asynchronous notifications under DDoS: > New BLOCK Option? > > Hi Jon, > Hi Med, > > > (1) The use of nonblock2 option with a "relax" of the behavior at the > server to send the fragments with the same token and without waiting for > GETs. > > The point will be, how this relaxation actually looks like. > FMPOV, the hard thing will be: > The server MUST not make assumptions about the token, except that it is > copied from the clients request into the response. > > Currently the followup blocks considered to have a empty token (Jon's > last note). That will hit any pending client requests with such a empty > token. The matching is considered to be done via the etag. But RFC 7252 > defines the etag with: > "An entity-tag is intended for use as a resource-local identifier". > Though it's an resource local identifier, in my opinion, you can't use > that to relate your blocks. The right blocks may have that etag, but > others responses may have it as well (therefore "resource-local > identifier"). > So, in my opinion, to know, to which resource the etags belongs to, the > related request is required. Usually matched by the token, but that > token is missing, because the client's request is missing. > > > best regards > Achim > > Am 09.04.20 um 11:27 schrieb Jon Shallow: > > Hi Carsten, > > > > I stand corrected - a token with 0 length. > > > > Regards > > > > Jon > > > >> -----Original Message----- > >> From: Dots [mailto: dots-bounces@ietf.org] On Behalf Of Carsten > Bormann > >> Sent: 09 April 2020 10:23 > >> To: Jon Shallow > >> Cc: mohamed.boucadair@orange.com; dots@ietf.org; core@ietf.org; > Achim > >> Kraus > >> Subject: Re: [Dots] [core] Large asynchronous notifications under DDoS: > >> New BLOCK Option? > >> > >> On 2020-04-09, at 11:20, Jon Shallow <supjps-ietf@jpshallow.com> wrote: > >>> > >>> With the new nonblock2 option, the non-head blocks can have no token > >> > >> CoAP messages always have a token. > >> > >> Grüße, Carsten > >> > >> _______________________________________________ > >> Dots mailing list > >> Dots@ietf.org > >> https://www.ietf.org/mailman/listinfo/dots > > > > _______________________________________________ > Dots mailing list > Dots@ietf.org > https://www.ietf.org/mailman/listinfo/dots
- [core] Large asynchronous notifications under DDo… mohamed.boucadair
- Re: [core] Large asynchronous notifications under… Christian Amsüss
- Re: [core] Large asynchronous notifications under… Jim Schaad
- Re: [core] Large asynchronous notifications under… mohamed.boucadair
- Re: [core] Large asynchronous notifications under… mohamed.boucadair
- Re: [core] Large asynchronous notifications under… Achim Kraus
- Re: [core] Large asynchronous notifications under… mohamed.boucadair
- Re: [core] [Dots] Large asynchronous notification… Jon Shallow
- Re: [core] [Dots] Large asynchronous notification… Achim Kraus
- Re: [core] [Dots] Large asynchronous notification… Jon Shallow
- Re: [core] [Dots] Large asynchronous notification… Achim Kraus
- Re: [core] [Dots] Large asynchronous notification… Carsten Bormann
- Re: [core] [Dots] Large asynchronous notification… Carsten Bormann
- Re: [core] Large asynchronous notifications under… Christian Amsüss
- Re: [core] [Dots] Large asynchronous notification… mohamed.boucadair
- Re: [core] [Dots] Large asynchronous notification… Jon Shallow
- Re: [core] [Dots] Large asynchronous notification… Achim Kraus
- Re: [core] [Dots] Large asynchronous notification… Achim Kraus
- Re: [core] [Dots] Large asynchronous notification… Jon Shallow
- Re: [core] [Dots] Large asynchronous notification… Jon Shallow
- Re: [core] [Dots] Large asynchronous notification… mohamed.boucadair
- Re: [core] [Dots] Large asynchronous notification… Carsten Bormann
- Re: [core] [Dots] Large asynchronous notification… mohamed.boucadair
- Re: [core] [Dots] Large asynchronous notification… Achim Kraus
- Re: [core] [Dots] Large asynchronous notification… mohamed.boucadair
- Re: [core] [Dots] Large asynchronous notification… Carsten Bormann
- Re: [core] [Dots] Large asynchronous notification… mohamed.boucadair
- Re: [core] [Dots] Large asynchronous notification… mohamed.boucadair
- Re: [core] [Dots] Large asynchronous notification… Jon Shallow
- Re: [core] [Dots] Large asynchronous notification… Carsten Bormann
- Re: [core] [Dots] Large asynchronous notification… Carsten Bormann
- Re: [core] [Dots] Large asynchronous notification… Jon Shallow
- Re: [core] [Dots] Large asynchronous notification… Achim Kraus
- Re: [core] [Dots] Large asynchronous notification… mohamed.boucadair
- Re: [core] [Dots] Large asynchronous notification… Jon Shallow