*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
# Ping
-A INPUT -p icmp -j ACCEPT
# SSH
-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -j ACCEPT
# SNMPD
-A INPUT -p udp -m udp --dport 161 -m state --state NEW -j ACCEPT
COMMIT