An introduction to filtering rules
We will follow the development of filtering rules for a simple
(home) computer with a single network interface.
Initially, we'll just consider packet filtering.
Firstly,
define the internal and external networking interfaces
that we have,
flush any existing iptables rules for the
filter table,
and define the default policy for each chain:
INT=ppp0
EXT=ppp0
/sbin/iptables -t filter -F
/sbin/iptables -t filter -X
/sbin/iptables -t filter -P INPUT DROP
/sbin/iptables -t filter -P FORWARD DROP
/sbin/iptables -t filter -P OUTPUT DROP
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CITS3002 Computer Networks, Lecture 11, Security of TCP/IP, p22, 15th May 2024.
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CITS3002