Netscreen interface question

["Michael Condren" <mjcon () hotmail com>]

Hi,

We are thinking of purchasing a Netscreen product to act a central firewall 
for all traffic in and out of our site.  Currently there are 4 routers used 
for traffic.  One for Internet access, the other three are used for 
communication with other sites over leased lines.  Netscreen firewalls only 
have three interfaces per box.  Is it possible to use the Netscreen as a 
firewall between our site and the other site when there are only 3 
interfaces on the firewall and four router LAN interfaces?  Can you route 
traffic to go in through one interface (router1->firewall int1) and out 
through the same interface (firewall int1 -> router1)?

Thanks


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