On Wed, 12 Apr 2000, Theodore Hong wrote:
> Mike Glover <mpg4 at duluoz.net> wrote:
> > Better question: if the route back gets messed up for some reason, how
> is
> > a "Depth" header going to help us find our way back? Either we have a
> > specific route back to the source of the request, or we need to
> broadcast
> > our reply to every node to be sure it gets where it belongs.
>
> It's not supposed to help you find your way back, it just kills you off
> so
> you don't wander around forever. But yeah, it seems like you could just
> (arbitrarily) set HTL to e.g. 50 on replies, although that would place a
> hard limit on HTL for requests. That is, you could never specify -htl >
> 50, which isn't so hot.
>
That makes (more) sense, but I'm still not sure why it's necessary.
Here's my understanding of how this works:
Node A creates a new Request.Data with UniqueID=1, and passes
it along to B.
B passes it to C, and puts an entry into a table saying that ID 1
came from A and was passed along to C.
C passes the message to D and makes a similar entry into it's table.
D has the data and sends the reply to C.
C looks up the ID in it's table, finds B, and passes the reply to it.
B passes the reply to A.
Is that right? I understand where HTL comes in -- you don't want to be
passing each request to millions of nodes. But what does Depth do? From
what's been said, it comes into play when, for example, B crashes before
receiving the reply from C. Yes? But in that case, C would notice that
it couldn't pass along the Reply and either queue it for later delivery
or just give up. If B comes back, but has lost it's state tables, it
should notice that it doesn't have an entry for the reply from C and drop
it. It shouldn't be possible to have a reply wandering around without
being expected anywhere.
Or am I misunderstanding something?
-mike
> theo
>
>
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