Iptables¶
Applicable Iptables rules in the installation.
Basic Rules¶
iptablesF
iptablesA INPUT -p icmp --icmp-type echo-request -j ACCEPT
iptablesA OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT
iptablesA INPUT -i lo -j ACCEPT
iptablesA INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptablesA INPUT -p tcp --dport 22 -j ACCEPT
iptablesP INPUT DROP
iptablesP FORWARD DROP
iptablesP OUTPUT ACCEPT
iptablesA INPUT -p udp -m udp --dport 5060 -j ACCEPT
iptablesA INPUT -p udp -m udp --dport 10000:20000 -j ACCEPT
iptablesA INPUT -p tcp -m tcp --dport 80 -j ACCEPT
Optional Rules¶
OPENVPN:
iptables -A INPUT -p udp --dport 1194 -j ACCEPT
ICMP:
iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
IAX:
iptables -A INPUT -p udp -m udp --dport 4569 -j ACCEPT
HTTPS:
iptablesA INPUT -p tcp -m tcp --dport 443 -j ACCEPT
Friendly Scanner¶
Rules to block not so friendly scanner
iptables -I INPUT -j DROP -p tcp --dport 5060 -m string --string "friendly-scanner" --algo bm
iptables -I INPUT -j DROP -p tcp --dport 5080 -m string --string "friendly-scanner" --algo bm
iptables -I INPUT -j DROP -p udp --dport 5060 -m string --string "friendly-scanner" --algo bm
iptables -I INPUT -j DROP -p udp --dport 5080 -m string --string "friendly-scanner" --algo bm
Optional
iptables -I INPUT -j DROP -p tcp --dport 5060 -m string--string "VaxSIPUserAgent" --algo bm
iptables -I INPUT -j DROP -p udp --dport 5060 -m string --string "VaxIPUserAgent" --algo bm
iptables -I INPUT -j DROP -p udp --dport 5080 -m string --string "VaxSIPUserAgent" --algo bm
iptables -I INPUT -j DROP -p tcp --dport 5080 -m string --string "VaxIPUserAgent" --algo bm
Show iptable rules¶
sudo iptables -L -v
Show line numbers¶
iptables -L -v --line-numbers
Block IP address¶
iptables -I INPUT -s 62.210.245.132 -j DROP
Save Changes¶
Centos
service iptables save
Debian / Ubuntu
apt-get install iptables-persistent
service iptables-persistent save
dpkg-reconfigure iptables-persistent