The IP Over NBMA (ION) Archive

[Jun Ogawa <ogawa@flab.fujitsu.co.jp>]

Golshan,

In message <199611212237.AA14728@halfdome.NSD.3Com.COM> you write:
>(5th paragraph) it states:
>"Note that an NHS SHOULD NOT cache source information which is an NHRP message
> because this information could be inappropriately used to setup a cut-through
> without doing proper filtering along a routed path. ....."
> 
>Later on page 43 (middle of the 1st paragraph) it states:
>"The NBMA information provided by the source station in the NHRP Resolution 
> Request may be cached for the duration of its holding time. This information
> is considered stable, since it identifies a station directly attached to 
> the NBMA subnetwork. ..."
>
>   Could anyone please explain why these statements are contradictory.

This is just the question which I have.

Also on page 43(just before section6.2.2) it states:
"Transit NHSs
A Transit NHS (lying along the NHRP path between the source station
and the responding NHS) may cache information contained in NHRP
Resolution Request packets that it forwards."

I think caching from source information is not so bad.
Because prohibiting of learning from source address information 
is NOT so strong to protect from "setup a cut-through without
doing proper filtering along a routed path".

When you need some filtering, you SHOULD separate NBMA subnetwork
don't you?

Thank you,
Jun Ogawa
ogawa@flab.fujitsu.co.jp