Re: Source address selection insufficient?

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

On 6-mrt-04, at 18:35, Joel M. Halpern wrote:

> I think that this is getting more complex than necessary.

This isn't complexity invented by us; it's just reality that we have to 
deal with.

> It is true that routing is frequently asymmetric.
> However, that is a very different statement from saying that 
> connectivity is asymettric.

Asymmetric routing + ingress filtering = asymmetric connectivity.

> While the routing path among ISPs for a given address pair (src, dst) 
> may be different in the forward and reverse direction, it would take a 
> very strange situation for a pair to work one way, and not when 
> reversed.

See Erik's original example or my interpretation of it in my message 
that you superfluously quoted in its entirety.