Besides setting the appropriate IP address for each internal MASQed machine (either statically or though DHCP), you should also set each internal machine with the appropriate gateway IP address of the Linux MASQ server and required DNS servers. In general, this is rather straight forward. You simply enter the address of your Linux host (192.168.0.1 is used throughout this HOWTO) as the machine's gateway address.
For the Domain Name Service (DNS), you add in any DNS servers that are available to you to use. The most apparent one(s) should be the DNS servers that your Linux server uses. You can optionally add any "domain search" suffix as well for quicker connections, etc.
After you have properly reconfigured the internal MASQed machines, remember to restart their appropriate network services or reboot them if need be.
The following configuration instructions assume that you are using a Class C network with 192.168.0.1 as your Linux MASQ server's address. Please note that 192.168.0.0 and 192.168.0.255 are reserved TCP/IP address per RFC1918 for uses just like enabling IP Masquerade services.
As it stands, the following Platforms have been tested as internal MASQed machines. This is only an EXAMPLE of all compatible OSes out there:
Apple Macintosh OS and OS-X (with MacTCP or Open Transport or the BSD TCP/IP stack)
AT&T Unix (Caldera)
*BSD systems including Free/Net/Open/BSDi/386/etc.
Commodore Amiga (with AmiTCP or AS225-stack)
Digital VAX Stations 3520 and 3100 with UCX (TCP/IP stack for VMS)
Digital Ultrix, Digital Unix (Compaq Tru/64)
HP HP/UX
IBM AIX running on RS/6000, PowerPC, etc.
IBM OS/2 (including Warp v3)
IBM OS400 running on a AS/400
Linux distributions from vendors like Caldera, Corel, Debian, Mandrake, Redhat, Slackware, SuSe, etc. running various kernels like 1.2.x, 1.3.x, 2.0.x, 2.1.x, 2.2.x, 2.3.x, 2.4.x, etc.
Microsoft DOS (with NCSA Telnet package, DOS Trumpet works partially)
Microsoft Windows 3.1 (with the Netmanage or FTP packages)
Microsoft Windows For Workgroup 3.11 (with a TCP/IP package)
Microsoft Windows 95, OSR2, 98, 98se, Me
Microsoft Windows NT 3.51, 4.0, 2000, XP - (both workstation (professional) and server versions)
Novell Netware 4.01, 5.x, etc. with the TCP/IP service
SCO Openserver (v3.2.4.2 and 5) and UnixWare (AT&T Unix)
Sun Solaris 2.51, 2.6, 7, 8
heheh.. what else am I missing?