Notes:

1. All rules are processed from top to down. Once a rule is matched (with jump), the rest will be ignored.
2. Never run iptables -F if the default rules are DROP or your system will be inaccessible. If possible, set the default rule to ACCEPT and add iptables -A INPUT -j DROP at the end.

List all rules

Flush all chains (-F) and delete all user-defined chains chains (-X)

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Note: Please ensure the default policy is ACCEPT or leave a ssh terminal before issuing

iptables -F

iptables -X

Set default policy (use with care)

iptables -P INPUT DROP

iptables -P FORWARD DROP

iptables -P OUTPUT DROP

Block incoming ip address

Block outgoing sites

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iptables -A OUTPUT -p tcp -d www.microsoft.co.uk -j DROP Altera tse driver.

Allow ping from specific ip’s only

iptables -A INPUT -s 1.2.3.0/24 -p icmp —icmp-type echo-request -j ACCEPT Tactrix port devices driver download for windows 8.1.

iptables -A INPUT -p icmp —icmp-type echo-request -j DROP

Allow ssh from specific ip’s only

iptables -A INPUT -s 1.2.3.0/24 -p tcp —dport 22 -m state –state NEW,ESTABLISHED -j ACCEPT

iptables -A INPUT -p tcp —dport 22 -m state –state NEW,ESTABLISHED -j DROP

Block incoming web access

Port forward

Forward incoming connection to another internal host (aa.bb.cc.dd:22)

iptables -t nat -A PREROUTING -I eth0 -p tcp —dport 1022 -j DNAT –to aa.bb.cc.dd:22

iptables -A FORWARD -p tcp -d aa.bb.cc.dd –dport 22 -m state –state NEW,ESTABLISH -j ACCEPT

Delete a rule

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iptables -L -n -v –line-numbers

Sonic core sound cards & media devices driver download for windows 10 7. iptables -D input {line-number}

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