Linux: 20 Iptables Examples For New SysAdmins

http://www.cyberciti.biz/tips/linux-iptables-examples.html

Taken from: nixCraft Linux Tips, Hacks, Tutorials, And Ideas In Blog

IPTABLES

# List the rules with line numbers,
# the -n disables the DNS reverse lookup
iptables -n --list --line-numbers

# Block a specific IP
iptables -A INPUT -s 192.168.0.1 -j DROP

# Allow SSH for a specific IP
iptables -A INPUT -s 192.168.0.2 -p tcp -m tcp --dport 22 -j ACCEPT

# Delete a rule based on its number
iptables -D INPUT 8

# Insert rule before other certain one
# For example before line # 3
iptables -I INPUT 3 -s 192.168.0.2 -p tcp -m tcp --dport 22 -j ACCEPT

Windows Firewall from the command line

netsh firewall show state

netsh firewall set opmode mode=DISABLE

netsh firewall set opmode mode=ENABLE exceptions=DISABLE

netsh firewall set opmode mode=ENABLE exceptions=ENABLE

More about it: http://support.microsoft.com/kb/947709