RPC, Portmapper binding and firewalls

From: Marcelo Barbosa Lima (marcelo.limaat_private)
Date: Tue Feb 15 2000 - 21:30:32 PST

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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.limaat_private)

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