Shorewall
/etc/default/shorewall Set startup=1
In /usr/share/doc/shorewall-common/default-config make the following edits to the following files and then copy them to /etc/shorewall
interfaces net eth1 82.94.91.79
modules (no edits)
policy fw net ACCEPT net all DROP info all all REJECT info
rules (under SECTION NEW) ACCEPT net fw tcp smtp ACCEPT net fw tcp pop3 ACCEPT net fw tcp ssh ACCEPT net fw tcp ftp ACCEPT net fw tcp ftp-data ACCEPT net fw tcp domain ACCEPT net fw udp domain ACCEPT fw net udp domain ACCEPT net fw tcp http ACCEPT fw net tcp http ACCEPT net fw tcp https ACCEPT net fw tcp snmp ACCEPT fw net tcp snmp ACCEPT net fw udp snmp ACCEPT fw net udp snmp ACCEPT net fw tcp 143 ACCEPT net fw udp 143
start dmesg -n5
zones net ipv4 (above fw firewall)