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H= i Brian,
Thanks for your questions and suggestions! =
Here are my responses and explanations to the questions:
<= div>
######Q1:
= >> I think this requires some extra specification - the recipie= nt must also cache the nonce in order to detect repeats. I think a repeat = needs to be acknowledged, but not processed a second time.

<= div>Your consideration is necessary, and a duplicate detection mechanism o= n the recipient side based on the nonce cache will be supplemented.
<= div>
######Q2 :
>> I don't see = a discussion of message integrity (i.e. the replacement for the TCP checks= um). Are you relying on the UDP checksum? Is there a negative acknowledgme= nt if there is a checksum error?

There is no checksum m= echanism in LW-GRASP (to avoid additional complexity), thus it relies on U= DP checksum. And, the = negative acknowledgment is not considered in this draft. When = there is a checksum error, = the packet will be discarded silently and the message will be retransmitte= d later.  A negative acknowledgment may be effective and will be cons= idered carefully.

= ######Q3:

>>CBOR does not re= quire you to limit this to 8 bits. So you could define it as larger, e.g. = 16 bits, but start assigning from zero ...

The length o= f the Objective number can be defined to be larger, but we think 8 bits is= enough for now. It is open to negotiation.

>> Also, do you expect the objectives to be standardised and registered= like normal GRASP objectives, or will they be local?
<= div>
<= span style=3D"background-color: transparent;">The only difference between = the LW-GRASP objectives and the standard GRASP objective is the identifier= , the former uses the number while the latter uses the text string. Thus, = the LW-GRASP objectives can be defined as generic or private like the stan= dard GRASP, which are specified in the draft as:

"The = first two bits of objective-num = indicate the LW-Objective type (00, 01, and 10 stand for generic LW-Objective; 11 stands for privately def= ined LW-Objective), and represen= t the number of LW-Objective together with the remaining six bits. Each generic LW-Objective MUST be assi= gned a unique objective number a= nd be made public to all LW-GRASP nodes when it's registered. When a private LW-Objective is defined, it = MUST also be assigned a uniquely= distinguishable objective number and be made public within the specific private domain."

&g= t;> For exam= ple, if you wanted to use "PrefixManager" and "PrefixManager.Params" from = RFC8992, would you give them numbers in addition?
=
Both = the generic and privately defined LW-GRASP objectives must be assigned a u= nique objective number for identification,  just like every standard = GRASP objective must have a unique objective name. However, given the poss= ible differences between the use case (e.g., Prefix Management) using LW-G= RASP and GRASP, the draft only assigns numbers to experimental objectives.= The number of other potential LW-GRASP objectives should be assigned when= the corresponding use case is defined. 

######= Q4:

The limited security capabiliti= es of resource-constrained devices are a real issue. More security issues = concerning constrained nodes and their possible solution will be considere= d.

Regards 
  &= nbsp; Longwei Zhu
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Sender: Brian E Carpenter
Send Time: 2024-07-11 11:30
cc: anima
Subject: Re: [Anima] pls comment: =E2=80=9CLightweight = GeneRic Autonomic Signaling Protocol=E2=80=9D(draft-zhu-anima-lightweight-= grasp-00)
Hi Longwei,
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I have a few questions:
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#1:
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>>  3.1. Reliable transmission for = confirmable LW-GRASP messages
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...
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>> If the LW-GRASP confirmable message d= oes not get an acknowledgment within the retransmission timeout, then the = message MUST be retransmitted, but there is no need to regenerate the Nonc= e, just keep it the same as the original message.
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What happens if the recipient has accepted the message and proces= sed it, but the acknowledgment is lost? Some GRASP messages (especially M_= NEGOTIATE) are not idempotent, so simply repeating a message could be dang= erous.
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I think this requires some extra s= pecification - the recipient must also cache the nonce in order to detect = repeats. I think a repeat needs to be acknowledged, but not processed a se= cond time.
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#2:
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I don't see a discussion of message integrity (i.e. the replacemen= t for the TCP checksum). Are you relying on the UDP checksum? Is there a n= egative acknowledgment if there is a checksum error?
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#3:
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>>  4.2.1. LW-= Objective option
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...
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 =
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>> objective-num =3D 0..255
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CBOR does not require you to limit this to 8 b= its. So you could define it as larger, e.g. 16 bits, but start assigning f= rom zero; that would make no difference on the wire unless you actually *n= eeded* more than 256 values.
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Also, do you= expect the objectives to be standardised and registered like normal GRASP= objectives, or will they be local? This needs to be explained. For exampl= e, if you wanted to use "PrefixManager" and "PrefixManager.Params" from RF= C8992, would you give them numbers in addition? ("PrefixManager" =3D 10, "= PrefixManager.Params" =3D 11)
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#4:
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>>  7. Security Considerations =0A
 
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The security people insisted that in RFC 899= 0, we specified use of TLS even over the ACP. This was for defence against= internal attackers. (I did implement an alternative, draft-carpenter-anim= a-quads-grasp, but it still needs a full crypto library.)
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&nb= sp;
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Regards
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    Brian
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On 05-Jul-24 01:29, =E6=9C=B1=E9=BE=99=E8=96=87 wrot= e:
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> Dear ANIMA WG members,
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>
=0A> We have proposed the draft =E2=80=9CLightweight GeneRic Autonomic S= ignaling Protocol=E2=80=9D(draft-zhu-anima-lightweight-grasp-00, https://d= atatracker.ietf.org/doc/draft-zhu-anima-lightweight-grasp/).
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= >
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> The draft aims to design a lightweight version of = GRASP, i.e., LW-GRASP, with shortened messages and a message-oriented buil= t-in reliability mechanism with the acknowledgment and retransmission capa= bility based on Nonce. The LW-GRASP can work reliably over UDP, which avoi= ds additional overhead caused by TCP=EF=BC=8Cthus can be more suitable for= resource-constrained IoT nodes. Furthermore, the possible IP-independent = method for LW-GRASP is also discussed.
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>
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>= ; We would like to hear opinions from the WG. All kinds of comments are we= lcome.
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>
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> Thanks
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>     Longwei Zhu
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>
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>
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> __________________________________________= _____
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> Anima mailing list -- anima@ietf.org
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