RPC, Portmapper binding and firewalls

["Marcelo Barbosa Lima" <marcelo.lima () dcc unicamp br>]

Hi all,


I am working with stateful packet filters and I'd like to know about RPC
sessions.


RPC normal communication sequence is:
Client -----------------> POrtmapper
Portmapper -----------> Client
Client ----------------> Server
Server----------------> Client

All right !
Yes, but at one second client 's query:


Client look for portmapper server binding in its cache and (Do it look for
binding?)
client ------------> server
server-----------> client
   .
   :

  Cache expires
 client-------------> Portmapper
  portmapper---> Client
  Client-----------> server
  Server-------> client

Is it ok??????

What is timeout of these bindings in client's cache for NFS clients, in this
last case (if true, of course)?
Regards,

                                                Marcelo
                                (marcelo.lima () dcc unicamp br)