query on ip configuration

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Hi All,

I'm facing a typical situation.  I have a iseries server with a single ethernet 
card, configured for 3 network addresses.  one internal & two extenal ip's( all 
with seperate route, subnet mask).  The surprising thing is the user who's 
configured to the local network (does not have any access to the external ip's) 
connects to the iseries server. And....from here he can do a telnet/ftp to any 
server that is attached to the external network(internet).  Can anyone comment 
how is it possible for the local user connected to the iseries to gets access 
to the internet??

How to restrict the local user from accessing the external network (internet) 
when connected to the iseries having a external ip configured??

TIA.



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