Re: [multipathtcp] discussions on draft-boucadair-mptcp-symmetric-02

[Olivier Bonaventure <[e-mail]>]

Yoshifumi,

> There were several discussions on draft-boucadair-mptcp-symmetric-02.txt
> I am thinking that we're setting down on these two points.
>
> 1: Changing ADD_ADDR formats (replacing IPVer field by Flags field)
> seems to be a reasonable idea.

I fully support this

> 2: How to use the flags field seems to need more discussions as this is
> scarce resource.

There are several possibly utilisations of these flags beyond
draft-boucadair-mptcp-symmetric-02.txt

- one flag could be used to indicate that an address is announced as a 
backup address, i.e. an address that if it is used will lead to a backup 
sufblow
- one flag could be used as an "echo" flag to enable a host to confirm 
the reception of an ADD_ADDR by echoing it. However, while providing 
reliable delivery of ADD_ADDR would be useful in some lossy scenarios, 
this also increases the complexity of the implementation on the host 
that sends the ADD_ADDR
>
> If this is acceptable for everyone, we can integrate 1: into 6824bis and
> continue discussions on the draft for the usage of the flags, etc.

I agree


Olivier