Configure pf Firewall

The philosophy we will use for the fire wall is that we split in 2 or 4 paths depending on the traffic initiated outside or inside. We als split the config in tcp and udp traffic for efficiency reasons see: NOTE link needed here to article or book.

So the general layout of the pf file is

Macro Definitions

In the macro definitions we declare the: interfaces, hosts, ports etc.
To be able to change port numbers or IP-addresses without the need to go through the complete configuration file.

TABLES

Here we define Tables used for spamd and ftp proxy functionality

TRANSLATION

In the translation section we define the redirect rules for incoming traffic. Like send http and https to the webserver and smtp traffic to the mailserver.

PACKET FILTERING

#======================================================
#	ext-if
#========================================
#	ext-if IN
#===========================
#	ext-if IN TCP
#===========================
#	ext-if IN UDP
#===========================
#	ext-if IN IMCP
#========================================
#	ext-if OUT
#===========================
#	ext-if OUT TCP
#===========================
#	ext-if OUT UDP
#===========================
#	ext-if OUT IMCP
#======================================================
#	int-if
#========================================
#	int-if IN
#===========================
#	int-if IN TCP
#===========================
#	int-if IN UDP
#===========================
#	int-if IN ICMP
#========================================
#	int-if OUT
#===========================
#	int-if OUT TCP
#===========================
#	int-if OUT UDP
#===========================
#	int-if OUT ICMP