iptables cheatsheet

iptables

Programs:
  iptables
  ip6iptables

Type:
  INPUT OUTPUT FORWARD
  ACCEPT DROP REJECT
  -s = Source IP
  -d = Destination IP
  -sport = Source Port
  -dport = Destination Port
  
Save:
  iptables-save
  apt-get install  iptables-persistent
  service  iptables-persistent save
  service iptables-persistent <tab>

List:
  iptables -L
  iptables -S (in command form)
  
Flush:
  iptables -F
  
Default:
  iptables -P INPUT ACCEPT

Loopback:
  iptables -I INPUT 1 -i lo -j ACCEPT
  
Append:
  iptables -A INPUT -p tcp --dport 22 -s 10.10.10.10 -j DROP
  
Connection:
  iptables -A INPUT -p tcp --dport 22 -s 10.10.10.10 -m state --state NEW,ESTABLISHED -j ACCEPT
  iptables -A OUTPUT -p tcp --sport 22 -d 10.10.10.10 -m state --state ESTABLISHED -j ACCEPT
  iptables -A INPUT -s 52.5.71.33 -j REJECT

vm

iptables -P FORWARD ACCEPT
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT

iptables -F

iptables -I INPUT 1 -i lo -j ACCEPT
iptables -A INPUT -s 192.168.56.1 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT

iptables -P FORWARD DROP
iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT