oracle sqlnet and nat with cisco routers

case description

drawing
===

                customerside a customerside
b                                                          

• ------ -------- ------ -------- ------

	server a	firewall a	router a	 	router b
firewall b	client b

facts
==we do nat on both side (customer a and b). on customerside b, nat is on
a
cisco router.
We nat the the destination ip adress (server a) in the direction to customerside a.on the the customerside a, the firewall do the nat for source
ip adress from
client b as well. so, you see we do a lot of nat. now we have a problem with oracle applications.the oracle server is one the
customerside a
and the client on the customerside b.
the client from customer b starts the sqlnet communication to the server
a.the first few
packets doing well, but after the communication is up, the oracle listener
form the the client
tells the oracle server the orignale ip adress from client. but this orignale ip adresse from
client b isn't known on customerside a. so the communication stands still.
so my questions is, are there some workarounds do solve this problem. please inform me.         

kind regards

Hansruedi Spycher
Network Access Solutions

Die Schweizerische Post
Information Technology Services
Webergutstrasse 12
CH-3030 Bern (Zollikofen)

Tel.	+41 / 31 / 338 83 20
Fax	+41 / 31 / 338 95 70
Mail	<mailto:spycherh_at_post.ch>

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