IPv4 Options for the Identifier-Locator Network Protocol (ILNP)
draft-irtf-rrg-ilnp-v4opts-06

I agree with Stewart's Discuss stating that there is no need to allocate
IPv4 options for this experiment since it can be run on existing 
experimental options.

The authors give a reason why using the existing values would
not meet their requirements. I dispute the reason as follows:

>  In order to experiment with a new protocol, an experimental value may
>  be needed that won't collide with an existing or future usage.

It is precisely the nature of experiments that they may colide if they are 
run in overlapping networks. There are sufficient code points available 
that this can be coordinated if there are multiple experiments. There are
no existing experiments that immediately spring to mind. Future
experiments will be less likely as IPv4 is sunsetted.

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The LISP documents (currently in the RFC Editor Queue for publication
as Experimental RFCs in the IETF Stream) have clear and unambiguous
text to caution the user about the unknown side-effects of conducting
the experiment on the Internet. For example, draft-ietf-lisp-23 says:

   This experimental specification has areas that require additional
   experience and measurement.  It is NOT RECOMMENDED for deployment
   beyond experimental situations.  Results of experimentation may lead
   to modifications and enhancements of protocol mechanisms defined in
   this document.  See Section 15 for specific, known issues that are in            
   need of further work during development, implementation, and
   experimentation.

   An examination of the implications of LISP on Internet traffic,
   applications, routers, and security is for future study.  This
   analysis will explain what role LISP can play in scalable routing and
   will also look at scalability and levels of state required for
   encapsulation, decapsulation, liveness, and so on.

It seems to me highly desirable that similar caveats be applied to this
work and added to the front of all ILNP documents. I strongly urge the
authors and IRSG to apply such text.

Thank you for addressing my discuss items.

I would like to suggest  that the authors verify that the IPv4 routers in their test network forward packets containing options with adequate performance before they invest significant time in the IPv4 Option approach.