>1) Why is this little test not working? > >2) How should I configure pf.conf (and maybe rc.conf.local with route >commands) to allow computers >communicate with each other (including Computer1 >with Computer5, thru Computer2)? In every information I >have found this is >automatically done with DHCP, which I won't use, or BGP-4, RIP,OSPF,etc., >which I will neither >use because these addresses and routes will be static.
You can assign a /30 between the router and each computer, they can be adjacent within a larger subnet, but not overlap. Enable forwarding of packets between interfaces, and instead of using NAT, you can have the upstream configure a static route pointing to your subnets, or to a single aggregated subnet that encompasses all of them. If you are manually configuring each device on the network you won't need DHCP.
