[ih] Separation of TCP and IP

[Dave Crocker]

On 6/23/2022 6:41 PM, Jack Haverty via Internet-history wrote:
> and they have no need for "sessions". 


This is a squirrel and I'm inclined to chase after it.

In the context you've used this clause, sure.  But I suspect we'd be in 
better shape if we'd actually taken advantage of the construct more 
generally.

I was intrigued to discover, some years back, that TLS is actually 
specified within a session layer model, though this bit of generality 
has apparently not been otherwise exploited.

The benefit of this layer is the tiresome one of indirection. The 
current reality is that one process interacts with another through a 
transport protocol. If this interaction is based on continuing state, 
there is no convention for maintaining process-process context if that 
transport interaction is lost. So the interaction has no robustness 
against outages or mobility.

A session layer can fix that, hiding changes from one transport 
'connection' to another. Move from Wi-Fi access to cell-based access and 
the applications see only some performance hiccups, but no loss of 
the... session.

woof.

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net