Here is a picture of typical network with FREESCO as Ethernet-to-Ethernet router:

In this configuration the 1st ethernet is used as link to ISP, the rest (ethernets and modems) are used as links to local or remote computers and networks. Let's have a look what setup procedure will do for us.

711 Hostname of this computer [router]?

For @home users: set the router name to the name provided by @home, f.i. CC25691-A. This is required for @home's DHCP server to give out a lease.

712 Domain name [inet]?
    How many ethernet cards do you have [1-3]? 3
811 I/O port address of 1st ethernet card [0x300]?
812 IRQ line of 1st ethernet card [11]?
821 I/O port address of 2nd ethernet card [0x320]?
822 IRQ line of 2nd ethernet card [7]?
831 I/O port address of 3rd ethernet card [0x340]?
832 IRQ line of 3rd ethernet card [13]?
720 Use DHCP client for configuring 1st network interface y/n [y]?

The 1st ethernet interface has ability to be configured through DHCP, it's very useful when you use a cable modem.

721 IP address of 1st network interface [10.0.0.1]?
722 Network mask [255.0.0.0]?
723 IP range [10.0.0.100 10.0.0.150]?
731 IP address of 2nd network interface [192.168.168.1]?
732 Network mask [255.255.255.0]?
733 IP range [192.168.168.100 192.168.168.150]?
741 IP address of 3rd network interface [172.22.0.1]?
742 Network mask [255.255.0.0]?
743 IP range [172.22.0.100 172.22.0.150]?
 14 Screen saver, in minutes. 0 - disable [0]?
 15 Swap file size in kbytes (on boot device). 0 - disable [0]?
 41 Enable caching DNS server y/n [y]?
421 Enable DHCP server y/n [y]?
422 WINS address (if you have one, otherwise - n) [10.0.0.2]?
431 Enable public HTTP server y/n [y]?
432 Public HTTP server IP port [80]?
441 Enable time server and router control via HTTP y/n [y]? s
442 Control HTTP server IP port [82]?
451 Enable Print Server y/n [y]?
452 Print server IP port [515]?
453 Output device name [lp1]?
 32 Host DNS address (usually your provider's DNS) [123.123.123.123]?
 75 Host gateway (if exist, otherwise - n) [233.233.233.233]?