Re: draft-bjh21-ssh-transport-extension-01

[Joseph Galbraith <galb-list%vandyke.com@localhost>]

der Mouse wrote:
>> 2. SSH_MSG_UNIMPLEMENTED has some drawbacks (in particular, it isn't
>>    reasonably possible to identify which packet was unimplemented.)
> 
> This is no worse than the stock protocol with respect to channel
> requests.
> 
>> [...]
>>    This has the advantage that the sender can differentiate between
>>    implementations not implementing the draft and implementations not
>>    implementing the extension.
> 
> Why would a sender care?  I'm having trouble thinking of a reason.

Well, the use case that comes to my mind is that if the draft
isn't implemented, the sender might which to avoid sending any
further extensions, but if it is just a specific extension,
the sender might care to use other extensions.

Thanks,

Joseph