Re: Host Addressing Conventions [addr-conv 2.8]

[Paul Francis--formerly Tsuchiya <[e-mail]>]

>  
>  Here's a diagram that I drew on the dinner table last night:
>  
>                              area1 | area2
>        +---------+                 |
>      +-+ router1 +-+               |
>      | +----+----+ |               |
>  sn1 |      |      | sn2           |
>      |  sn3 |      |               |
>      |      |      | +---------+   |   /other
>    +-+--------+    +-+ router3 +-------|connections
>    | router2  |      +---------+   |   \in area2
>    +----------+                    |
>  
>  
>  Hosts discover router3 using Router Discovery; area2 has a different
>  Pip address, so this makes sense.  Hosts discover router1 and router2

This sentence confuses me.  Which hosts are discovering router3?
Those on sn2?

>  using HIP (the Host Identification Protocol); they treat router3

Why don't hosts discover routers 1 and 2 using router discovery as well?

>  (which they learned about through RD) just as if it were another host,
>  for the purpose of directing packets toward it.  Routers discover
>  hosts in the same way that hosts discover other hosts: they send the
>  first packet multicast, and then wait for a ``you-found-me'' reply to
>  come back.

Huh?  But, a router must "discover" a host before it has packets
to send to it....so that it can advertise it in routing updates.....

I'm confused.....

PX