Firewall

Ubuntu ufw

Generally check status with

sudo ufw status verbose

If you like to copy rules from one to another computer: rules are stored in

/lib/ufw

Configuration files are in

/etc/ufw
/etc/gufw

Ggufw

With single IP from special client to your server.

With IP range from any client in subnet to your server.

Qsynergy

sudo ufw allow proto tcp to any port 24800 from 192.168.0.0/16

Samba

Easy setup

sudo ufw allow Samba

or

sudo ufw allow from any app Samba to 192.168.0.1
sudo ufw allow from 192.168.1.0/24 to any app samba

Special setup

Alter the ufw configuration file

gedit /etc/default/ufw

# The nf_contrack_netbios_ns has been added
IPT_MODULES="nf_conntrack_ftp nf_nat_ftp nf_conntrack_irc nf_nat_irc nf_conntrack_netbios_ns"

Samba

sudo ufw allow proto tcp to any port 135 from 192.168.0.0/16
sudo ufw allow proto udp to any port 137 from 192.168.0.0/16
sudo ufw allow proto udp to any port 138 from 192.168.0.0/16
sudo ufw allow proto tcp to any port 139 from 192.168.0.0/16
sudo ufw allow proto tcp to any port 445 from 192.168.0.0/16

Avahi / bonjour /zeroconf

sudo ufw allow proto udp to any port 5353 from 192.168.0.0/16

Cups

sudo ufw allow from 192.168.1.0/24 to any app cups