Re: soft state (was Re: shim6 and bit errors in data packet headers

[Iljitsch van Beijnum <iljitsch@muada.com>]

On 10-mei-2005, at 23:28, Erik Nordmark wrote:

> Why would we want to couple the state management aspects of shim6  
> but the shim6 test protocol? To me any such coupling seems  
> undesirable, especially since the parameters for the test protocol  
> (how quickly to detect failures) might be a function of upper layer  
> advise, as well as upper layer hints of "working" or "not working".

The reachability testing protocol needs to have access to the shim  
state because it may need to discover unidirectional reachability. If  
we assume A1, A2 and B1, B2 where A1 -> B1 and B2 -> A2 are the only  
working paths, doing a simple ping or something like it won't find  
these paths.

People may also want to limit reachability testing to known  
correspondents for security reasons.