Re: #1416: USEPRO 3.9: Reinjection and Injection-Date

["Forrest J. Cavalier III" <forrest@xxxxxxxxxxxxxxx>]

Russ Allbery wrote:
> Forrest has proposed only allowing reinjection between disjoint networks.

Well, no.  I was coerced.  My original text said little.  Then I upped it
to handle leaf nodes.  Then I was coerced to consider the disjoint network 
multi-injection.  This WG is a broadening experience, doncha know.

> If the reinjecting agent is the only possible path between two otherwise
> disjoint networks, then the reinjecting agent can do article identity
> verification for the second network and it doesn't matter if the article
> acquires a new identity when crossing that network boundary.  The
> difficulty here, as Charles correctly points out, is that there's no
> general way of establishing that two networks are disjoint.  One can
> sometimes determine for individual articles that they passed through a
> host on network A and on network B and therefore the networks are not
> disjoint, but to be sure would require full knowledge of at least one of
> the networks.  There are some common cases where this is possible, but
> it's not possible in general, and it's possible to think that you know the
> networks are disjoint and be wrong.

I don't think we can solve the general case.  Are we going to try to standardize 
"Daves the resurrectors"?  Yikes!

I fully admit I provided text that applied for the narrow case, but I think it
is the extremely most common case.

If you are a private leaf node, you know you want to reinject articles posted 
locally and no others.  In this case, you KNOW articles did not pass through A 
nor B, because they originated at your node and you haven't relayed them yet,
since you don't relay.  QED.

You can implement this many different ways.  I don't think we need to 
standardize that implementation.

Sure, I understand there are people who will want to reinject who are not
private leaf nodes.  They are not my concern unless they can fit the description 
in the text we provide.

Let those with other cases read Duties of Gateways.  They don't get
a standard formula, because this WG doesn't have a consensus about
their needs and prevalance, and the Injection-Date scheme that was
proposed is now consensed to be faulty (although different WG members
think it is flawed for different reasons.)