-
The transport layer is the main layer for firewalls to operate in.
- The main function
of firewalls is to filter the packets transferred on the network, so
that only the packets we wish to accept will come through.
-
There are two types of firewalls: stateful and stateless.
-
The Linux
Kernel has a built-in stateful firewall module, called "iptables"
or "netfilter".
- More details about configuring firewall
in Linux can be found here:
http://www.netfilter.org/documentation/index.html#HOWTO
-
Eli Billauer has given a lecture
about iptables.
Written by Shlomi Fish