The firewall script (/etc/pf.conf, usually) will tell you how the thing acts as a firewall. That cannot be moved, unchanged, to 4.7, but the upgrade guides along the way will explain what changes will need to be made.
The /etc/hostname.* files will give you your network configuration. The hostname.if(5) man page will help you understand those files.
The pkg_info(1) command will tell you all 3rd party software installed on your platform through the packages/ports system, described in FAQ 15.
The sysctl.conf(5) file will show any "knobs" that might have been turned -- routers/firewalls, for instance, should have ip forwarding enabled there.
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