Re: [netmod] Mirja Kühlewind's Discuss on draft-ietf-netmod-acl-model-19: (with DISCUSS)

[Mahesh Jethanandani <[e-mail]>]

> On Sep 21, 2018, at 6:47 AM, Mirja Kühlewind <[e-mail]> wrote:
> 
> Mirja Kühlewind has entered the following ballot position for
> draft-ietf-netmod-acl-model-19: Discuss
> 
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> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-netmod-acl-model/
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> 
> 
> ----------------------------------------------------------------------
> DISCUSS:
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> 
> 1) The tcp options element is type uint32, however, the option field in the TCP
> header can be up to 40 bytes.

You are right that the options field can be up to 40 bytes long.

To the WG - We have two options in front of us. Take the field out completely or change the type to binary, and add a ‘length’ restriction of 40. Unless there is a objection, we will go with the latter option.

> 
> 2) Why are only TCP and UDP supported? What's about SCTP and DCCP?

There has been no requirement to support either of those protocols. Support for those protocols can be added as augmentations to the base model in the future if such a need arises.

> 
> 3) The icmp rest-of-header can also be larger than 4 bytes but the type is
> uint32 again.

You are right that the rest-of-header can be more than 4 bytes, but in reality we have not had a requirement to support more than 4 bytes. 

To the WG - We will give it the same treatment as above - two options. Take it out completely, or change this to binary also. The only difference is that there does not seem to be a length restriction on the size of the field, so the field will be left unbounded. Unless there is a objection, we will go with the conversion to binary option.

Cheers.

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