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jini problem under NAT and suggestions required

chetan raj
Ranch Hand

Joined: Jul 18, 2006
Posts: 34
Hello,

I have gone through many posts and forums spending lot of time
researching on this issue.

After months of work with Jini, we have finished writing a complex push
client/server based on jini. Things work fine in local LAN but not in
production environment (Murphy's law).


My setup is like this

The LUS server running JINI sends a message to all the services
registered with it - thereby acting as a client too

Jini LUS -> Machine with valid static IP
Service is provided by a machine under NAT (Local IP - 192.168.0.x,
Global IP (firewall) - Valid static IP)
Client -> Machine with valid static IP (actually the same machine which
is running Jini LUS)

Problem

Eg Client: A machine under NAT registers with Jini and the server tries
to send some message periodically. When requesting for the object from
other machine, the lookup service returns its local IP (192.x) instead
of the static IP (69.x). As a result, it throws an IOException. I assume
that providing with real IP address would not help too as the firewall
would not allow incoming packets if the connection is being invoked from
external servers (typical firewall).

Questions

a) Does Jini behave well under NAT? I have seen mixed responses on this
subject. For me, it does not work.
b) If not, what are the workarounds? Should I just use some poller which
changes the functionality of client as server but this increases traffic.


Please help me out how can i make it work.
chetan raj
Ranch Hand

Joined: Jul 18, 2006
Posts: 34
hai, please give some reply to my queries. If anything is unclear
please let me now. Why there is no reply for this questions.
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
 
subject: jini problem under NAT and suggestions required
 
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