Firewalls, Network Address Translation (NAT), network logging and
accounting are all provided by Linux's Netfilter system, also known
by the name of the command used to administer it, iptables. The
iptables interface is the most sophisticated ever offered on
Linux and makes Linux an extremely flexible system for any kind
of network filtering you might do. Large sets of filtering rules
can be grouped in ways that makes it easy to test them and turn
them on and off.
Do you watch for all types of ICMP traffic--some of them quite
dangerous? Can you take advantage of stateful filtering to simplify
the management of TCP connections? Would you like to track how much
traffic of various types you get?
This pocket reference will help you at those critical moments
when someone asks you to open or close a port in a hurry, either to
enable some important traffic or to block an attack. The book will
keep the subtle syntax straight and help you remember all the
values you have to enter in order to be as secure as possible. The
book has an introductory section that describes applications,
followed by a reference/encyclopaedic section with all the matches
and targets arranged alphabetically.
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