iptables ubuntu

[Stevyn]

https://upcloud.com/community/tutorials ... es-ubuntu/

Listing current rules

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iptables -L --line-numbers

Iptables can track the state of the connection, so use the command below to allow established connections to continue.

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iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT

ssh

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iptables -A INPUT -p tcp --dport ssh -j ACCEPT

default rule to drop will permit only specifically accepted connection

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iptables -P INPUT DROP

save

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iptables-save > /etc/iptables/rules.v4

restore

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iptables-restore < /etc/iptables/rules.v4
ip6tables-restore < /etc/iptables/rules.v6

[Stevyn]

auto restore at boot

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apt-get install iptables-persistent