Re: [I2nsf] Questions about draft-baspez-i2nsf-capabilities-00

[Aldo Basile <[e-mail]>]

Dear Linda,

this ambiguity is a consequence of my bad relation with the textual 
syntax of I-D, while I usually work with LaTeX and I conceive formulas 
in LaTeX format (and, honestly, I still don't understand why it is not 
also adopted by IETF).

I'm sorry for this, I'll work to improve formulas readability for the 
version 01 or for the merged version (the one we are working on with 
John Strassner and Frank Xialiang).

1) AC (both capital letters) is the set of all the existing actions, 
thus AC will include “permit”, “deny”, “redirect”, “log”, “alert”, and 
all the actions that may describe any of the enforcement activities 
performed by whatever security function.

2) Ac is a subset of AC that represents the actions actually available 
at the security function we want to describe.
Therefore, for a basic packet filter it will most likely include only 
“permit”, “deny”, and “redirect”, while more sophisticated functions 
will have their own set of actions (that, to make the model coherent, 
should nevertheless be also replicated in the AC that will contain all 
of them).

"[" graphically depicts the LaTeX symbol \subseteq (look at the relation 
symbols here http://web.ift.uib.no/Teori/KURS/WRK/TeX/symALL.html) which 
I used to depict the subset relation (a [ b means that the left one 
contains a subset of the elements in b but it may possibly contain the 
same elements as b).
I added a sentence in the draft explaining this use, but it was probably 
very vague.

Hope this clarifies the and hope I can solve editing issues in the next 
versions.

Regards,
Aldo


On 05/10/2016 19:12, Linda Dunbar wrote:
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> Aldo and Diego,
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> The section 4.1 of your draft has this expression:
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> Our capabilities are defined by a 4-tuple:
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> (Ac; Cc; RSc; Dc) [ (AC; CC; RSC; DC)= K
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> Is it intentional to have “[“ without the matching one “]”?
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> What is the relationship between “Ac” and “AC”? are they the same?
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> If a NSF supports more actions than the simple “permit” or “deny” (e.g.
> “redirect”, “log”, “alert”, etc), will then be listed in “AC” or “Ac”?
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> Thanks, Linda
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