Firewall

Ubuntu ufw

Generally check status with

sudo ufw status verbose

Ggufw

With single IP

With IP range

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