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References

The newest Linux kernel is available from:

   ftp://ftp.cs.helsinki.fi/pub/pub/Software/Linux/Kernel/
   ftp://ftp.nluug.nl/pub/os/Linux/system/kernel/

The home page of ipfwadm on the World Wide Web:

   http://www.xos.nl/linux/ipfwadm/

The ipfwadm package can be obtained via:

   ftp://ftp.xos.nl/pub/linux/ipfwadm/

Some recommended books about firewalls:

Building Internet Firewalls
D. Brent Chapman, Elizabeth D. Zwicky
O'Reilly & Associates, Inc.
ISBN 1-56592-124-0
Firewalls and Internet Security
William R. Cheswick, Steven M. Bellovin
Addison-Wesley Publishing Company
ISBN 0-201-63357-4

Note that this paper is based on Linux 1.3.88 and ipfwadm 2.0, describing the situation in April 1996.
A revision of this paper for Linux 2.0.x and ipfwadm 2.3.0 is planned, but not yet available.

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