Thanks, John (and Tim, who sent me the actual PDF file last night)
-e-
----- Original Message -----
From: John Neiberger <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Friday, March 23, 2001 6:48 AM
Subject: Re: [ARP over Token Ring]
> Yep, here ya go! It's pretty good.
>
> http://www.ccprep.com/resources/news/archives/Token_Ring2.pdf
>
> >>> "EA LOUIE" <[EMAIL PROTECTED]> 3/22/01 5:24:31 PM >>>
> John - is that a publicly accessible paper?
>
> -e-
>
> "John Neiberger" <[EMAIL PROTECTED]> wrote:
> > I'm reading through Lou Rossi's token ring paper and read something
> that
> > is ponderous. Over ethernet, an ARP request is broadcast but the
> reply
> > is unicast. In this paper (p. 4) there is a scenario where two
> hosts
> > are separated by two bridges and a ring. Host A wants to transmit
> to
> > Host B so it ARPs for B's MAC address.
> >
> > Now, the paper mentions that after the ARP reply, A knows the MAC
> > address of B but not the location. My question is this: is an ARP
> > reply over token ring unicast or broadcast? If it's unicast then
> how
> > did B send the response to A? Wouldn't it have to send an explorer
> > packet first to find the path to A?
> >
> > It seems to me that this is the process:
> >
> > A wants to say hi to B
> > A sends an ARP request (broadcast) to B
> > B receives request and wants to send unicast response to A
> > B sends a local explorer for A (no response)
> > B sends an all-routes explorer for A (gets a response)
> > B sends a unicast ARP reply to A
> >
> > Is that right? If that's the case, then here's what I gather
> happens
> > next:
> >
> > A now has B's MAC address
> > A sends a local explorer for B (no response)
> > A sends an all-routes explorer for B (gets a response)
> > A proceeds to transmit data to B
> >
> > Here's what doesn't make sense to me. If B had to know the path to
> A
> > to send an ARP reply, why doesn't A just take the data in the RIF
> from
> > that reply to figure out the reverse path back to B? Why waste time
> > with explorer packets when it was just given the path in the ARP
> > reply??
> >
> > Or, do ARP requests/replies even have RIFs? If not, are they all
> > broadcast in token ring?
> >
> > Can you tell I'm just starting out studying token ring and SRB? <g>
> >
> > Thanks as usual!
> >
> > John
> >
> > _________________________________
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