Penetration Testing a Firewalled Network

[kratzer.jason () gmail com]

I too have a question regarding pen-testing a firewalled network.  How would someone be capable of scanning and 
attempting to determine internal IP addresses beyond the firewall when pen-testing across the internet.  Is it as 
simple as defining static routes to push all packets to the destinations firewall(gateway)?  Maybe I am overthinking 
this issue but so far I haven't been able to be able to come up with an acceptable answer.  Any help would be greatly 
appreciated.

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