Cisco PIX and Nortel Contivity design question

["Risto, Jonathan" <jonathan.risto@bellnexxia.com>]

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Good afternoon,

I have a question in regards to the Cisco PIX firewall and a Nortel Network
Contivity 1500 series VPN box.  A diagram of what we are attempting to
implement is as follows


    ISP   ---------------- PIX    --------- Internal Network
                     |           L2 Switch
                     |                |
                  1500 ---------------------


There will be NAT running on the PIX.  The site-to-site tunnel which will be
going from the 1500 will be going to an identical setup at another site at
the far end of this connection. 

What concerns do I need to worry about in setting up this situation? Are
there any design issues that I should take into considerations?  Is there a
better design that we should be considering? 


Thanks in advance,

Jonathan


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