More info

First of all, look at the manual page of ipfwadm, ipfwadm(8). If you need some more info about what the Linux firewalling and accounting code really does, you might also want to look at the ipfw(4) manual page. Note: don't confuse these with the ancient ipfw(8) manual page, that was distributed with the old ipfw utility, a predecessor of ipfwadm.

To get an introduction on the use of ipfwadm, together with some real-life examples, look at the paper we wrote (back in 1996).

Neither the manual pages nor the paper are trying to teach you about firewall theory in general. To design a proper firewall, you need to have some basic level of knowledge about firewalls, IP packet filtering, etc. To learn more about these topics, we recommend the book Building Internet Firewalls, 2nd Edition, written by Elizabeth D. Zwicky, Simon Cooper, and D. Brent Chapman, and published by O'Reilly.

1-8-2011 - X/OS has moved!

X/OS has moved to a new office, but stays at the Amsterdam Science Park.