There are several things you should check assuming your Linux IP Masq box already has proper connections to the Internet and your LAN: .:: blogfreely.net ::.
Make sure you have the necessary features and modules are compiled and loaded. See earlier sections for details.
Check /usr/src/linux/Documentation/Changes and make sure you have the minimal requirement for the network tools installed. .:: www.komoot.com ::. .:: www.businesslistings.net.au ::.
Make sure you followed all of the tests in Chapter 5 of the HOWTO.
Make sure you are using the proper firewall tool for you kernel be it IPTABLES, IPCHAINS, or IPFWADM. .:: ml007.k12.sd.us ::. [Research on Django]
If you are doing PORTFW functionality, make sure you use the correct tool for your kernel version. IPTABLES has everything built-in, IPCHAINS requires the use of IPMASQADM, and IPFWADM reaquires the use of IPPORTFW or IPAUTOFW. This is completely covered in [NPM Package: Redis] Section 6.7.
Go through all setup and configuration again! Usually, it's just a typo or a simple mistake you are overlooking. .:: slackcommunity.com ::. .:: zenwriting.net ::. .:: telegra.ph ::.