IPTables rules for ntopng

First of all, let’s look at the current IPTables rules:

iptables -nvL

To open the ntopng port, add the rule:

sudo iptables -A INPUT -m tcp -p tcp --dport 3000 -j ACCEPT

To open the ntopng port for a specific network or IP only:

sudo iptables -A INPUT -m tcp -p tcp --dport 3000 -s 10.0.0.0/24 -j ACCEPT

See also my articles:
Configuring IPTables
Install and configure ntopng