Re: Requirements [was Re: Transport level multihoming]

[Brian E Carpenter <brian@hursley.ibm.com>]

Thanks Margaret for getting some precision into the discussion.

Margaret Wasserman wrote:

...
> Let's make a distinction between the ability to do two 
> things:
> 
>          (a) Establish and use new upper layer communication
>                  sessions (i.e. TCP connections).
>          (b) Maintain existing upper layer communication sessions.
> 
> Is it required that an existing IPv6 stack be able to do (a)
> and/or (b) in the following site multi-homing situations?
> 
>          (1)  When both (or all) of the multi-homed site's
>               connections to the Internet are working?
> 
>                  Obviously, we need (a) and (b) to work.
> 
>          (2)  When one of the multi-homed site's connections to
>               the Internet stops working?
> 
>                  We need (a).  Do we need (b)?  Or is acceptable
>                  to require host software updates to obtain
>                  reliable connections in this situation?
> 
My answer is no, it would be a very serious mistake to require (b)
in this case. It would result in an undeployable solution.

   Brian